COMPRESSOR COMPONENT FOR TRANSPORT AND METHOD FOR MANUFACTURING SAME

Abstract

A compressor component for a transport is provided, which is excellent in mechanical characteristics at a high temperature. The compressor component is made of an aluminum-alloy that includes Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities The compressor component is configured to include therein an Al—Fe-based intermetallic compound, and in the cross-sectional surface structure of the compressor component, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm.

Description

TECHNICAL FIELD

The present invention relates to a compressor component for a transport, which is made of an aluminum-alloy that is excellent in mechanical characteristics at a high temperature, and a manufacturing method thereof.

BACKGROUND ART

Conventional compressor components for a transport, for example, turbocharger impellers are caused to rotate at high speed exceeding 10,000 rpm under a high-temperature condition of around 150° C., and are therefore expected to have high strength and high rigidity at such a high temperature, and to be reduced in weight in order to reduce energy loss. In addition, strength durable for high speed rotation is also expected.

In the conventional art, a turbocharger impeller was manufactured by cutting a cast/forged product made of 2618 alloy (an alloy composed of Cu: 1.9-2.7 mass %, Mg: 1.3-1.8 mass %, Ni: 0.9-1.2 mass %, Fe: 0.9-1.3 mass %, Si: 0.1-0.25 mass %, and Ti: 0.04-0.1 mass %, the remainder being Al).

However, in association with higher speed cutting operation developed in recent years, occasions to perform such cutting on an aluminum-alloy extruded material have increased, and thus an enhancement of the machinability and an improvement in high-temperature strength have been further required.

For example, Patent Document 1 discloses a technique for providing an Al—Cu—Mg-based aluminum alloy extruded material of which the strength at a high temperature (160° C.) has been more improved than those in the past. Specifically, Patent Document 1 describes a heat-resistant aluminum-alloy extruded material that is characterized by including Cu: 3.4-5.5% (mass %, the same shall apply hereafter), Mg: 1.7-2.3%, Ni: 1.0-2.5%, Fe: 0.5-1.5%, Mn: 0.1-0.4%, Zr: 0.05-0.3%, Si: less than 0.1%, and Ti: less than 0.1%, the remainder being Al and unavoidable impurities, which is excellent in high-temperature strength and high-temperature fatigue characteristics.

PRIOR ART LITERATURE

Patent Document

Patent Document 1

Japanese Patent No. 5284935

SUMMARY OF THE INVENTION

Problem(s) to be Solved by the Invention

Now, in the technical field of internal combustion engines of automobiles, etc., turbocharger impellers are required to rotate at more higher speed, and thus an aluminum-alloy material for constituting a turbocharger impeller is desired to be excellent in mechanical characteristics even in a temperature range higher than that in the past. In addition, with regard to characteristics required for a compressor component for a transport such as turbocharger impellers, etc., dynamic strength including creep property, etc., is also required to be excellent in addition to static strength.

The present invention has been made in view of such a technical background, and it is an object of the invention to provide a compressor component for a transport that is excellent in mechanical characteristics (static strength, creep property, etc.) at a high temperature, and a manufacturing method thereof.

Means for Solving the Problems

In order to achieve the above-mentioned object, the present invention provides the following means.

[1] A compressor component for a transport, which is made of an aluminum-alloy that includes Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, wherein

the compressor component for a transport includes an Al—Fe-based intermetallic compound, and

in the cross-sectional surface structure of the compressor component for a transport, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm.

[2] The compressor component for a transport according to the above 1, wherein the aluminum-alloy further includes 0.0001-0.03 mass % of B.

[3] The compressor component for a transport according to the above 1 or 2, wherein

the intermetallic compound is an Al—Fe—V—Mo-based intermetallic compound including at least Al. Fe, V, and Mo, and

in the intermetallic compound, the Al content is 81.60-92.37 mass %, the Fe content is 2.58-10.05 mass %, the V content is 1.44-4.39 mass %, and the Mo content is 2.45-3.62 mass %.

[4] A method for manufacturing a compressor component for a transport, including:

a compression-molding step of compression-molding an aluminum-alloy powder comprising Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, to thereby obtain a green compact;

an extruding step of hot-extruding the green compact to thereby obtain an extruded material; and

a cutting step of cutting the extruded material to thereby obtain a compressor component for a transport, wherein

the compressor component for a transport includes therein an Al—Fe-based intermetallic compound, and

in the cross-sectional surface structure of the compressor component for a transport, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm.

[5] A method for manufacturing a compressor component for a transport, including:

a powdering step of powdering a molten aluminum-alloy including Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, by rapid-solidification using an atomizing method, to thereby obtain an aluminum-alloy powder;

a compression-molding step of compression-molding the aluminum-alloy powder to thereby obtain a green compact;

an extruding step of hot-extruding the green compact to thereby obtain an extruded material; and

a cutting step of cutting the extruded material to thereby obtain a compressor component for a transport, wherein

the compressor component for a transport includes therein an Al—Fe-based intermetallic compound, and

in the cross-sectional surface structure of the compressor component for a transport, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm.

Effects of the Invention

According to the invention [1], a compressor component for a transport, which is made of an aluminum-alloy that is excellent in mechanical characteristics (static strength, creep property, etc.) at a high temperature is provided.

According to the invention [2], a compressor component for a transport, which is made of an aluminum-alloy in which (values of) mechanical characteristics at a high temperature are further improved, is provided.

According to the invention [3], a compressor component for a transport, which is made of an aluminum-alloy in which (values of) mechanical characteristics at a high temperature are still further improved, is provided.

According to the inventions [4] and [5], a compressor component for a transport, which is made of an aluminum-alloy that is excellent in mechanical characteristics (static strength, creep property, etc.) at a high temperature, can be manufactured. Thus, the resulting compressor component for a transport can be suitably used as a compressor component for a transport such as automobiles, and the like.

Further, in the invention [5], a molten aluminum-alloy is powdered by rapid-solidification using an atomizing method to obtain an aluminum-alloy powder. Therefore, diffusion of each element of the alloy during solidification is restrained, coarsening of crystal grains and precipitates can be restrained, also appearance of an equilibrium phase or a metastable phase can be restrained, and moreover, the solid-solution amount of Fe that is a transition element can be increased, so that a compressor component for a transport, which is made of an aluminum-alloy that is even more excellent in mechanical characteristics (static strength, creep property, etc.) at a high temperature can be manufactured.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a perspective view that shows one example of a compressor component for a transport according to the present invention.

MODES FOR CARRYING OUT THE INVENTION

A compressor component for a transport of the present invention is configured to be made of an aluminum-alloy that includes Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, wherein the compressor component for a transport includes an Al—Fe-based intermetallic compound, and

in the cross-sectional surface structure of the compressor component for a transport, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm. According to such a configuration, a compressor component for a transport, which is made of an aluminum-alloy that is excellent in mechanical characteristics (static strength, creep property, etc.) at a high temperature can be provided.

Next, a method for manufacturing a compressor component for a transport, of the present invention will be explained below. According to the present manufacturing method, an aluminum-alloy powder that includes Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, is prepared. Although the means for manufacturing the aluminum-alloy powder having the above-specified composition are not particularly limited, it is preferable to powder a molten aluminum-alloy including Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, by rapid-solidification using an atomizing method, to thereby obtain an aluminum-alloy powder (an aluminum-alloy atomized powder) (powdering step).

In the above-mentioned powdering step, the molten aluminum-alloy having the above-mentioned specific composition is prepared by a normal dissolution method. The resulting molten aluminum-alloy is powdered by the atomizing method. The atomizing method is a method in which fine droplets of molten aluminum alloy are atomized and sprayed by flow of a gas such as nitrogen gas, etc. from a spray nozzle, and are rapidly solidified to thereby obtain a fine aluminum-alloy powder. The cooling rate is preferably 10²-10⁵° C./second. It is preferable to obtain an aluminum-alloy powder of which an average particle diameter is 30-70 μm. Owing to being 30 μm or more, the yield in the preparation of the alloy powder can be remarkably improved, and owing to being 70 μm or less, mixing of coarse oxides and foreign matters can be avoided. The resulting aluminum-alloy powder is preferably classified using a sieve.

Next, the resulting aluminum-alloy powder obtained in the above-mentioned powdering step is compression-molded to obtain a green compact (compression-molding step). For one example, the aluminum-alloy powder that has been heated to 250-300° C. is filled in a mold that has been heated to 230-270° C., and is compression-molded into a predetermined shape to thereby obtain a green compact. Although the pressure for the compression-molding is not particularly limited, normally it is preferably set to 0.5-3.0 ton/cm². Further, the green compact is preferably made to have a relative density of 60-90%. Although the shape of the green compact is not particularly limited, it is preferably cylindrical-shaped or disk-shaped in consideration of the subsequent extruding step.

Next, the resulting green compact obtained in the above-mentioned compression-molding step is hot-extruded to obtain an extruded material (extruding step). The green compact is subjected to machining such as chamfering as needed, thereafter subjected to degassing treatment, and heated to be subjected to the extruding step. The heating temperature for the green compact prior to the extrusion is preferably set to 300-450° C. In the extrusion, for example, the green compact is inserted into an extrusion container, and applied with an applied pressure by an extruding ram so as to be extruded from an extrusion die in a form of a round-bar. At this time, the extrusion container is preferably heated to 300-400° C. in advance. By hot-extruding in this way, plastic deformation of the green compact proceeds, and an extruded body in which aluminum-alloy powder (particles) are combined with each other and integrated is obtained. During the extrusion, the extrusion pressure is preferably set to 10-25 MPa.

Next, the resulting extruded material obtained in the above-mentioned extruding step is cut to obtain a compressor component for a transport (cutting step). For example, the extruded material is subjected to a lathe machining, and thereafter is cut using a cutting tool such as a ball end mill, etc. in a 5-axis machining center or the like to thereby obtain a compressor component for a transport having a predetermined shape (see FIG. 1).

The resulting compressor component for a transport obtained in the above-mentioned cutting step is configured to include therein an Al—Fe-based intermetallic compound, and in the cross-sectional surface structure of the compressor component for a transport, the average circle-equivalent diameter of which falls within a range of 0.1-3.0 μm. Thus, a compressor component for a transport 1 of the present invention can be obtained (see FIG. 1).

Consequently, the compressor component for a transport 1, which was obtained by the manufacturing method of a compressor component for a transport according to the above-mentioned invention is configured to be made of an aluminum-alloy that includes Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, wherein the compressor component for a transport includes therein an Al—Fe-based intermetallic compound, and in the cross-sectional surface structure of the compressor component for a transport, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm.

It is noted that the compressor component for a transport 1 according to the present invention is not limited to the compressor component for a transport obtained by the above-mentioned manufacturing method, and includes those obtained by other manufacturing methods.

Next, the composition of “aluminum-alloy” in the compressor component for a transport and the method for manufacturing a compressor component for a transport according to the above-mentioned present invention, will be described in detail. The aluminum-alloy is an aluminum-alloy that includes Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass/%, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities.

The Fe (component) is an element, which forms an Al—Fe-based intermetallic compound having a high melting point, and can improve the mechanical characteristics (static strength, creep property, etc.) in a high temperature range of, for example, 200-350° C. The Fe content of the aluminum-alloy is set within a range of 5.0-9.0 mass %. If the Fe content is less than 5.0 mass %, the strength of the compressor component for a transport is reduced, on the other hand, if the Fe content exceeds 9.0 mass %, the ductility of the compressor component for a transport is reduced, so that a compressor component for a transport that is excellent in mechanical characteristics (static strength, creep property, etc.) at a high temperature cannot be obtained. In particular, the Fe content of the aluminum-alloy is preferably within a range of 7.0-8.0 mass %.

The V (component) is an element, which forms an Al—Fe—V—Mo-based intermetallic compound, and can improve the mechanical characteristics (static strength, creep property, etc.) in a high temperature range of, for example, 200-350° C. The V content of the aluminum-alloy is set within a range of 0.1-3.0 mass %. If the V content is less than 0.1 mass %, the strength of the compressor component for a transport is reduced, on the other hand, if the V content exceeds 3.0 mass %, the ductility of the compressor component for a transport is reduced, so that a compressor component for a transport that is excellent in mechanical characteristics (static strength, creep property, etc.) at a high temperature cannot be obtained. In particular, the V content of the aluminum-alloy is preferably within a range of 1.0-2.0 mass %.

The Mo (component) is an element, which forms an Al—Fe—V—Mo-based intermetallic compound, and can improve the mechanical characteristics (static strength, creep property, etc.) in a high temperature range of, for example, 200-350° C. The Mo content of the aluminum-alloy is set within a range of 0.1-3.0 mass %. If the Mo content is less than 0.1 mass %, the strength of the compressor component for a transport is reduced, on the other hand, if the V content exceeds 3.0 mass %, the ductility of the compressor component for a transport is reduced, so that a compressor component for a transport that is excellent in mechanical characteristics (static strength, creep property, etc.) at a high temperature cannot be obtained. In particular, the Mo content of the aluminum-alloy is preferably within a range of 1.0-2.0 mass %.

The Zr (component) is an element, which prevents coarsening of an Al—Fe—V—Mo-based intermetallic compound, and can achieve fine crystallization of the intermetallic compound. In addition, by including the Zr, high-temperature strength can be improved, and self-diffusion of Al in the Al matrix can be restrained, so that the effect of improving the creep property can be obtained. The Zr content of the aluminum-alloy is set within a range of 0.1-2.0 mass %. If the Zr content is less than 0.1 mass %, there occurs a problem in that the effects of precipitation strengthening and dispersion strengthening cannot be exhibited. On the other hand, if the Zr content exceeds 2.0 mass %, a coarse intermetallic compound containing Zr is formed (see Comparative Example 9 described later), so that favorable mechanical characteristics cannot be obtained. In particular, the Zr content of the aluminum-alloy is preferably in the range of 0.5-1.5 mass %.

The Ti (component) serves to form an Al-(Ti, Zr)-based intermetallic compound having an L₁₂ structure with Al in cooperation with the Zr. In addition, because the diffusion coefficient in the Al matrix, of the Ti is small, the effect by which creep property can be increased, is also obtained. The Ti content of the aluminum-alloy is set within a range of 0.02-2.0 mass %. If the Ti content is less than 0.02 mass %, there occurs a problem in that the effects of precipitation strengthening and dispersion strengthening cannot be exhibited. On the other hand, if the Ti content exceeds 2.0 mass %, the ductility of the compressor component for a transport is reduced, so that a compressor component for a transport that is excellent in mechanical characteristics (static strength, creep property, etc.) at a high temperature cannot be obtained. In particular, the Ti content of the aluminum-alloy is preferably within a range of 0.5-1.0 mass %.

In the present invention, the aluminum-alloy may have a configuration (composition) further containing 0.0001-0.03 mass % of B (Boron). By setting the composition so as to include B in the above-specified percentage, crystal grains can be made fine to thereby improve the mechanical characteristics.

According to the present invention, the compressor component for a transport includes an Al—Fe-based intermetallic compound, and in the cross-sectional surface structure of the compressor component for a transport, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm. If the average circle-equivalent diameter of the intermetallic compound is less than 0.1 μm, the effect of dispersion strengthening cannot be exhibited. On the other hand, if the average circle-equivalent diameter of the intermetallic compound exceeds 3.0 μm, the intermetallic compound becomes coarse, and from which breakages start, so that there occurs a problem in that the mechanical characteristics are reduced. In particular, in the cross-sectional surface structure of the compressor component for a transport, the average circle-equivalent diameter of the Al—Fe-based intermetallic compound is preferably within a range of 0.3-2.0 μm, and still further preferably within a range of 0.4-1.5 μm.

The Al—Fe-based intermetallic compound is not particularly limited, and an Al—Fe—V—Mo-based intermetallic compound that contains at least Al, Fe. V, and Mo can be exemplified. The Al—Fe—V—Mo based intermetallic compound is preferably configured such that the Al content is 81.60-92.37 mass %, the Fe content is 2.58-10.05 mass %, the V content is 1.44-4.39 mass %, and the Mo content is 2.45-3.62 mass %. In this case, favorable mechanical characteristics can be obtained in a high-temperature range of 200° C. or higher.

It is noted that the equivalent circle diameter of the Al—Fe-based intermetallic compound corresponds to a value converted to a diameter of a circle that has the same area as that of the Al—Fe-based intermetallic compound in an SEM photograph (image) of the cross section of the compressor component for a transport 1.

WORKING EXAMPLES

Specific working examples of the present invention will be described in the following, however, the present invention is not particularly limited to these working examples.

Working Example 1

An aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 0.1 mass %, and Al: 86.9 mass % with unavoidable impurities, was heated to thereby obtain a molten aluminum-alloy of 1000° C. Thereafter, the molten aluminum-alloy was atomized with a gas, rapidly solidified, and powdered to thereby obtain an aluminum-alloy powder (aluminum-alloy atomized powder) having an average particle diameter of 50 μm (powdering step).

Next, the resulting aluminum-alloy powder was preheated to a temperature of 280° C., the preheated aluminum-alloy powder was filled in a mold that has been heated to and held at 280° C., and compression-molded with a pressure of 1.5 ton/cm² to thereby obtain a cylindrical green compact (molded body) having a diameter of 210 mm and a length of 250 mm. Next, the resulting green compact was chamfered to have a diameter of 203 mm with a lathe to thereby obtain a green compact billet (compression-molding step).

Next, the resulting billet was heated to 400° C., the heated billet was inserted into an extrusion container having an inner diameter of 210 mm, which has been heated to and held at 400° C., and extruded by an indirect extrusion method with an extrusion die having an inner diameter of 83 mm at an extrusion ratio of 6.4 (extruding step).

Next, the resulting extruded material was subjected to a lathe machining, and thereafter was cut using a ball end mill (a cutting tool) in a 5-axis machining center to thereby obtain a compressor component for a transport 1 as shown in FIG. 1 (cutting step).

Working Example 2

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 0.5 mass %, and Al: 86.5 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 3

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 86.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 4

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 2.0 mass %, and Al: 85.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 5

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 0.5 mass %, Ti: 1.0 mass %, and Al: 86.5 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 6

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %. Mo: 2.0 mass %, Zr: 1.5 mass %, Ti: 1.0 mass %, and Al: 85.5 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 7

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 0.5 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 87.5 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 8

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 1.5 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 86.5 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 9

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 0.5 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 87.5 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 10

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 1.5 mass %. Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 86.5 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 11

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 6.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 88.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Working Example 12

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 7.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 87.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Comparative Example 1

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 0.5 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, and Al: 87.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 2

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %. Zr: 1.0 mass %, Si: 2.0 mass %, Cu: 0.13 mass %, Mg: 0.13 mass %, and Al: 86.74 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 3

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Si: 2.0 mass %, and Al: 85.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 4

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Mg: 1.0 mass %, and Al: 86.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 5

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Ti: 1.0 mass %, and Al: 87.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 6

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 88.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 7

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 88.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 8

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 94.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 9

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 2.5 mass %, Ti: 1.0 mass %, and Al: 84.5 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 10

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 8.0 mass %, V: 2.0 mass %, Mo: 4.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 84.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

Comparative Example 11

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 6.0 mass %, V: 4.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 86.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport 1 was obtained.

Comparative Example 12

With the same manner as in Working Example 1 except for using an aluminum-alloy that includes Fe: 10.0 mass %, V: 2.0 mass %, Mo: 2.0 mass %, Zr: 1.0 mass %, Ti: 1.0 mass %, and Al: 84.0 mass % with unavoidable impurities as an aluminum-alloy for preparing a molten aluminum-alloy, a compressor component for a transport was obtained.

	TABLE 1
					Compara-	Compara-	Compara-	Compara-
	Working	Working	Working	Working	tive	tive	tive	tive
	Example 1	Example 2	Example 3	Example 4	Example 1	Example 2	Example 3	Example 4
Alloy	Fe (mass %)	8.0	8.0	8.0	8.0	8.0	8.0	8.0	8.0
Composition	V (mass %)	2.0	2.0	2.0	2.0	2.0	2.0	2.0	2.0
	Mo (mass %)	2.0	2.0	2.0	2.0	2.0	—	2.0	2.0
	Zr (mass %)	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0
	Ti (mass %)	0.1	0.5	1.0	2.0	—	—	—	—
	Si (mass %)	—	—	—	—	—	2.0	2.0	—
	Cu (mass %)	—	—	—	—	—	0.13	—	—
	Mg (mass %)	—	—	—	—	—	0.13	—	1.0
	Al (mass %)	86.9	86.5	86.0	85.0	87.0	86.74	85.0	86.0
Average Circle Equivalent Diameter (μm)	0.60	0.76	0.63	0.78	0.89	0.92	0.80	0.80
of Intermetallic Compounds
Evaluation	Tensile Strength (MPa)	351/◯	370/⊚	399/⊚	461/⊚	338/X	271/X	285/X	338/X
	at High Temperature (260° C.)
	Fatigue Strength (MPa)	206/◯	211/⊚	220/⊚	239/⊚	201/Δ	161/X	167/X	200/Δ
	at High Temperature (260° C.)
	Creep Rupture Strength (MPa)	213/◯	223/⊚	236/⊚	262/⊚	209/Δ	168/X	177/X	202/X
	at High Temperature (260° C.)
Comprehensive Evaluation	◯	⊚	⊚	⊚	X	X	X	X

	TABLE 2
	Working	Working	Working	Working	Working	Working	Working	Working
	Example 5	Example 6	Example 7	Example 8	Example 9	Example 10	Example 11	Example 12
Alloy	Fe (mass %)	8.0	8.0	8.0	8.0	8.0	8.0	6.0	7.0
Composition	V (mass %)	2.0	2.0	2.0	2.0	0.5	1.5	2.0	2.0
	Mo (mass %)	2.0	2.0	0.5	1.5	2.0	2.0	2.0	2.0
	Zr (mass %)	0.5	1.5	1.0	1.0	1.0	1.0	1.0	1.0
	Ti (mass %)	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0
	Si (mass %)	—	—	—	—	—	—	—	—
	Cu (mass %)	—	—	—	—	—	—	—	—
	Mg (mass %)	—	—	—	—	—	—	—	—
	Al (mass %)	86.5	85.5	87.5	86.5	87.5	86.5	88.0	87.0
Average Circle Equivalent Diameter (μm)	0.70	0.75	0.71	0.76	0.69	0.72	0.57	0.60
of Intermetallic Compounds
Evaluation	Tensile Strength (MPa)	368/⊚	429/⊚	378/⊚	419/⊚	359/⊚	426/⊚	353/◯	368/⊚
	at High Temperature (260° C.)
	Fatigue Strength (MPa)	208/◯	237/⊚	208/◯	231/⊚	207/◯	235/⊚	205/◯	209/◯
	at High Temperature (260° C.)
	Creep Rupture Strength (MPa)	217/⊚	254/⊚	217/⊚	229/⊚	212/◯	228/⊚	210/◯	221/⊚
	at High Temperature (260° C.)
Comprehensive Evaluation	◯	⊚	◯	⊚	◯	⊚	◯	◯

	TABLE 3
	Compara-	Compara-	Compara-	Compara-	Compara-	Compara-	Compara-	Compara-
	tive	tive	tive	tive	tive	tive	tive	tive
	Example 5	Example 6	Example 7	Example 8	Example 9	Example 10	Example 11	Example 12
Alloy	Fe (mass %)	8.0	8.0	8.0	—	8.0	8.0	6.0	10.0
Composition	V (mass %)	2.0	2.0	—	2.0	2.0	2.0	4.0	2.0
	Mo (mass %)	2.0	—	2.0	2.0	2.0	4.0	2.0	2.0
	Zr (mass %)	—	1.0	1.0	1.0	2.5	1.0	1.0	1.0
	Ti (mass %)	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0
	Si (mass %)	—	—	—	—	—	—	—	—
	Cu (mass %)	—	—	—	—	—	—	—	—
	Mg (mass %)	—	—	—	—	—	—	—	—
	Al (mass %)	87.0	88.0	88.0	94.0	84.5	84.0	86.0	84.0
Average Circle Equivalent Diameter (μm)	0.71	0.68	0.74	0.48	3.16	3.21	3.11	4.56
of Intermetallic Compounds
Evaluation	Tensile Strength (MPa)	338/X	349/Δ	345/Δ	195/X	329/X	317/X	331/X	298/X
	at High Temperature (260° C.)
	Fatigue Strength (MPa)	186/X	197/X	190/X	107/X	181/X	174/X	176/X	163/X
	at High Temperature (260° C.)
	Creep Rupture Strength (MPa)	199/X	209/Δ	204/X	115/X	193/X	186/X	190/X	175/X
	at High Temperature (260° C.)
Comprehensive Evaluation	X	X	X	X	X	X	X	X

For each compressor component for a transport (a cut product) obtained in the above-mentioned way, evaluation was performed on the basis of the following evaluation method. The results are shown in Tables 1 to 3. It is noted that each notation of“−” in element columns indicates a value of less than the detection limit (0.005 mass %) (in other words, the element was not detected).

“Average Circle Equivalent Diameter (μm) of Intermetallic Compounds” in Tables 1 to 3 shows an average circle equivalent diameter (μm) of Al—Fe—V—Mo-based intermetallic compounds (intermetallic compounds including at least Al, Fe, V, and Mo) that are present in the matrix of each compressor component for a transport. With regard to this “average circle equivalent diameter (μm) of intermetallic compounds”, a sample piece for structure observation having a dimension of 10 mm in length, 10 mm in width and 10 mm in thickness was cut out from the main body (a shaft portion) at the center of the resulting compressor component for a transport, and was polished for microstructure observation using a cross-section specimen preparing device (cross section polisher), the sample piece thus polished was photographed to take an SEM photograph (a scanning electron micrograph), and from the photographic image of the SEM photograph, an average circle equivalent diameter (μm) of intermetallic compounds was determined (for evaluation). For ten Al—Fe—V—Mo-based intermetallic compounds that are present in the visual field ranging over 1.5815 mm² in the SEM photograph, an average equivalent circle diameter was determined.

(Tensile Strength Evaluation Method at High Temperature)

The resulting compressor components for a transport were processed to tensile test pieces having a gauge length of 20 mm and a parallel portion diameter of 4 mm, and the tensile test pieces were subjected to high-temperature tensile test to measure high temperature tensile strengths (tensile strengths at 260° C.). The high-temperature tensile test was performed under a measurement environment of 260° C. after the high-temperature tensile test pieces were held at 260° C. for 100 hours. The evaluation was made on the basis of the following criteria.

(Criteria)

⊚ Tensile strength at 260° C.: 355 MPa or more

◯ Tensile strength at 260° C.: 350 MPa or more and less than 355 MPa

Δ Tensile strength at 260° C.: 345 MPa or more and less than 350 MPa

x Tensile strength at 260° C.: less than 345 MPa

(Fatigue Test Method at High Temperature)

The resulting compressor components for a transport were processed to fatigue test pieces having a gauge length of 30 mm and a parallel portion diameter of 8 mm, and the fatigue test pieces were subjected to high-temperature fatigue test to measure high temperature fatigue strengths (fatigue strengths at 260° C.). The high-temperature fatigue test was repeatedly performed 500,000 times under a measurement environment of 260° C. with a condition of 3600 rpm after the high-temperature tensile specimens were held at 260° C. for 100 hours. The evaluation was made on the basis of the following criteria

(Criteria)

⊚ Fatigue strength at 260° C.: 210 MPa or more

◯ Fatigue strength at 260° C.: 205 MPa or more and less than 210 MPa

Δ Fatigue strength at 260° C.: 200 MPa or more and less than 205 MPa

x Fatigue strength at 260° C.: less than 200 MPa

(Creep Test Method at High Temperature)

The resulting compressor components for a transport were processed to creep test pieces having a gauge length of 30 mm and a parallel portion diameter of 6 mm, and the creep test pieces were subjected to high-temperature creep test to measure high-temperature creep properties (creep properties at 260° C.). The high-temperature creep test was performed under a measurement environment of 260° C. after the creep test pieces were held at 260° C. for 100 hours. The creep rupture strengths were calculated under conditions of a temperature of 260° C. and a rupture time of 300 hours, and evaluation was made on the basis of the following criteria

(Criteria)

⊚ Creep rupture strength at 260° C.: 215 MPa or more

◯ Creep rupture strength at 260° C.: 210 MPa or more and less than 215 MPa

Δ Creep rupture strength at 260° C.: 205 MPa or more and less than 210 MPa

x Creep rupture strength at 260° C.: less than 205 MPa

As apparent from the tables, the compressor components for a transport of Working Examples 1-12 according to the present invention were excellent in various mechanical characteristics at a high temperature (260° C.).

In contrast, the compressor components for a transport of Comparative Examples 1-12, which were deviated from the specific range of the present invention, were inferior in the mechanical characteristics at a high temperature (260° C.).

INDUSTRIAL APPLICABILITY

The compressor component for a transport according to the present invention, and a compressor component for a transport obtained by the manufacturing method of the present invention are excellent in mechanical characteristics at a high temperature, therefore can be suitably used as a compressor component for a transport such as automobiles, etc.

Claims

1. A compressor component for a transport, which is made of an aluminum-alloy that comprises Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, wherein

the compressor component for a transport includes an Al—Fe-based intermetallic compound, and

in the cross-sectional surface structure of the compressor component for a transport, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm.

2. The compressor component for a transport according to claim 1, wherein the aluminum-alloy further comprises 0.0001-0.03 mass % of B.

3. The compressor component for a transport according to claim 1, wherein

the intermetallic compound is an Al—Fe—V—Mo-based intermetallic compound including at least Al, Fe, V, and Mo, and

in the intermetallic compound, the Al content is 81.60-92.37 mass %, the Fe content is 2.58-10.05 mass %, the V content is 1.44-4.39 mass %, and the Mo content is 2.45-3.62 mass %.

4. A method for manufacturing a compressor component for a transport, comprising:

compression-molding an aluminum-alloy powder comprising Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, to thereby obtain a green compact;

hot-extruding the green compact to thereby obtain an extruded material; and

cutting the extruded material to thereby obtain a compressor component for a transport, wherein

the compressor component for a transport includes therein an Al—Fe-based intermetallic compound, and

in the cross-sectional surface structure of the compressor component for a transport, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm.

5. A method for manufacturing a compressor component for a transport, comprising:

powdering a molten aluminum-alloy comprising Fe: 5.0-9.0 mass %, V: 0.1-3.0 mass %, Mo: 0.1-3.0 mass %, Zr: 0.1-2.0 mass %, and Ti: 0.02-2.0 mass %, the remainder being Al and unavoidable impurities, by rapid-solidification using an atomizing method, to thereby obtain an aluminum-alloy powder;

compression-molding the aluminum-alloy powder to thereby obtain a green compact;

hot-extruding the green compact to thereby obtain an extruded material; and

cutting the extruded material to thereby obtain a compressor component for a transport, wherein

the compressor component for a transport includes therein an Al—Fe-based intermetallic compound, and

in the cross-sectional surface structure of the compressor component for a transport, an average circle-equivalent diameter of the Al—Fe-based intermetallic compound falls within a range of 0.1-3.0 μm.