Abstract: A powder metal material for additive manufacturing contains: (A) a non-magnetic steel powder which is free of nitrogen; and (B) at least one powder selected from a chromium nitride powder and a ferrochromium nitride powder, a particle size of the component (B) is 10.0 ?m?D50?25.0 ?m in terms of volume average particle size, and a content of the component (B) is 0.1 mass % to 3.5 mass % with respect to a total amount of the powder metal material.

Abstract: Provided is a heat exchanger in which first flow paths for flowing a first fluid and second flow paths for flowing a second fluid are arranged adjacent via a partition wall through which heat exchange is performed. The partition wall includes parallel tubular partition walls inside of which is the first flow paths. At least a part of the tubular partition walls in a flow path direction are integrally coupled to form a partition wall coupling portion having a geometric pattern in transverse cross section. An element figure of the geometric pattern corresponding to a transverse cross-sectional shape of the tubular partition wall is connected to each other at a vertex, and the number of sides of the element figure gathering at the vertex is an even number. In the partition wall coupling portion, the second flow paths are defined between outer peripheral surfaces of the surrounding tubular partition walls.

Abstract: A powder metal material for additive manufacturing, which is an aluminum alloy, in which the powder metal material has an absorption rate of 65% or more determined by the following regression equation: Absorption rate (%)=23.5+1.9[Si]+7.4[Fe]?4.0[Cu]+109.6[Mn]+45.1[Mg]?14.5[Zn]?14.2[Ti]+2.6[Ni]?3.0[Zr]?218.1[Sc], where, [ ]represents a content (mass %) of each element.

Abstract: A powder metal material for additive manufacturing contains: (A) a non-magnetic steel powder which is free of nitrogen; and (B) a ferrovanadium nitride powder, and a particle size of the component (B) is 15.0 ?m?D50?25.0 ?m in terms of volume average particle size, and a content of the component (B) is 0.3 mass % to 3.0 mass % with respect to a total amount of the powder metal material.

Abstract: A steel material for additive manufacturing containing: 0.3 to 0.8 mass % of C; 0.6 to 2 mass % of Mn; 1 to 7 mass % of Cr; 2 mass % or less of V; and 3 mass % or less of Mo, in which a martensite transformation start temperature is 130° C. to 200° C., and a bainite transformation start time at the martensite transformation start temperature+30° C. in an isothermal transformation curve is 200 seconds or longer.

Abstract: A powder metal material for additive manufacturing contains: (A) a non-magnetic steel powder which is free of nitrogen; and (B) a ferromanganese nitride powder, a particle size of the component (B) is 15.0 ?m?D50?25.0 ?m in terms of volume average particle size, and a content of the component (B) is 0.4 mass % to 4.0 mass % with respect to a total amount of the powder metal material.

Abstract: An austenitic non-magnetic steel containing: 8.0 to 15.0 mass % of Mn; 0.05 to 0.50 mass % of N; 0.20 to 1.00 mass % of C; 2.0 to 15.0 mass % of Cr; and 3.0 mass % or less of V, and a powder metal material for additive manufacturing, which is an austenitic non-magnetic steel containing: 8.0 to 15.0 mass % of Mn; 0.20 to 1.00 mass % of C; 2.0 to 15.0 mass % of Cr; and 3.0 mass % or less of V.

Abstract: A powder metal material in order to being used in additive manufacturing, in which the powder metal material is an aluminum alloy, and the aluminum alloy contains at least one selected from the group consisting of Ti, Zr, and P, and the additive manufacturing is additive manufacturing using a 3D printer.

Abstract: A powder metal material in order to be used in additive manufacturing, in which the powder metal material is an aluminum alloy, and the aluminum alloy contains at least one metal atom having a smaller atomic radius than that of aluminum and having a higher electron density than that of aluminum.

Abstract: A powder metal material for additive manufacturing contains: (A) a non-magnetic steel powder which is free of nitrogen; and (B) at least one powder selected from a chromium nitride powder and a ferrochromium nitride powder, a particle size of the component (B) is 10.0 ?m?D50?25.0 ?m in terms of volume average particle size, and a content of the component (B) is 0.1 mass % to 3.5 mass % with respect to a total amount of the powder metal material.

Abstract: The present disclosure provides an aluminum alloy to be used in laminate molding containing Si, Fe, Mn and inevitable impurities, in which ?-phase Al—Si—Fe intermetallic compound is present in the aluminum alloy. In addition, a manufacturing method of a laminated molding is provided which laminate molds using powder of this aluminum alloy. Further, a laminate molding of this aluminum alloy is provided.

Abstract: The present disclosure provides an aluminum alloy to be used in laminate molding containing Si, Fe, Mn and inevitable impurities, in which ?-phase Al—Si—Fe intermetallic compound is present in the aluminum alloy. In addition, a manufacturing method of a laminated molding is provided which laminate molds using powder of this aluminum alloy. Further, a laminate molding of this aluminum alloy is provided.

Abstract: An iron alloy manufacturing method which can suppress occurrence of distortion and crack in formed iron alloy layers is provided. During execution of a forming step, in a first temperature control step, an iron alloy layer temperature T1 of a predetermined number of laminated layers from a surface layer of iron alloy layers formed in the forming step is controlled to be kept within a range of Ms?T1?Ms+?, and in a second temperature control step, a base plate temperature T2 is controlled to be kept within a range of Mf???T2?Mf.

Abstract: Provided is a heat exchanger in which first flow paths for flowing a first fluid and second flow paths for flowing a second fluid are arranged adjacent via a partition wall through which heat exchange is performed. The partition wall includes parallel tubular partition walls inside of which is the first flow paths. At least a part of the tubular partition walls in a flow path direction are integrally coupled to form a partition wall coupling portion having a geometric pattern in transverse cross section. An element figure of the geometric pattern corresponding to a transverse cross-sectional shape of the tubular partition wall is connected to each other at a vertex, and the number of sides of the element figure gathering at the vertex is an even number. In the partition wall coupling portion, the second flow paths are defined between outer peripheral surfaces of the surrounding tubular partition walls.

Abstract: A refractory magnesium alloy includes magnesium as a principal ingredient, and an element having a radius 9–14% larger than a magnesium atom and a maximum concentration of 2 mass % or larger in a solid solution with magnesium is mixed in an amount not exceeding a maximum amount that can be homogeneously mixed in the solid solution with magnesium, whereby internal strength of grains thereof is enhanced. Alternatively, gadolinium with a content thereof ranging from 0.5 to 3.8 mass % is added, so that remaining part other than the gadolinium is composed of the magnesium and unavoidable impurities. This magnesium alloy serves to inhibit decrease in proof stress and creep deformation, especially primary creep deformation when used at high temperatures, typically at 200° C. The magnesium alloy may be employed for a structural material for a vehicle, so that a lightweight and heat-resistant structural material can be obtained.

Abstract: A refractory magnesium alloy includes magnesium as a principal ingredient, and an element having a radius 9-14% larger than a magnesium atom and a maximum concentration of 2 mass % or larger in a solid solution with magnesium is mixed in an amount not exceeding a maximum amount that can be homogeneously mixed in the solid solution with magnesium, whereby internal strength of grains thereof is enhanced. Alternatively, gadolinium with a content thereof ranging from 0.5 to 3.8 mass % is added, so that remaining part other than the gadolinium is composed of the magnesium and unavoidable impurities. This magnesium alloy serves to inhibit decrease in proof stress and creep deformation, especially primary creep deformation when used at high temperatures, typically at 200° C. The magnesium alloy may be employed for a structural material for a vehicle, so that a lightweight and heat-resistant structural material can be obtained.

Abstract: A thixocast casting material is formed of an Fe—C—Si based alloy in which an angle endothermic section due to the melting of a eutectic crystal exists in a latent heat distribution curve and has a eutectic crystal amount Ec in a range of 10% by weight<Ec<50% by weight. This composition comprises 1.8% by weight≦C≦2.5% by weight of carbon, 1.4% by weight≦Si≦3% by weight if silicon and a balance of Fe including inevitable impurities.

Abstract: A construction is provided in which a drain hole 4 provided with internal threads 3 in a Mg alloy oil pan 1 is closed with a screw-type plug body 5 constituted by a metal other than Mg and Mg alloy. The plug body 5 has a threaded shank 6 screwed into the drain hole 4 and an enlarged end 7 having a diameter larger than that of the threaded shank 6. A corrosion preventing plate 14 fitted on the threaded shank 6 via a threaded shank passing hole 15 is disposed between a washer 11 of the enlarged end 7 and a peripheral portion 13 of an opening of the drain hole 4 which corresponds to the washer 11 so that there is provided an electrical insulation between the washer 11 and the peripheral portion 13 of the opening. The corrosion preventing plate 14 has a plurality of annular sealing projections on both sides thereof which are arranged in a concentric fashion about the threaded shank passing hole 15 so as to bite into the peripheral portion 13 of the opening and the washer 11.

Abstract: A metallic mold-casting method excellent in the resistance to penetration is herein disclosed and the method comprises the steps of forming a coating layer by applying a mixture comprising at least one member selected from the group consisting of high melting metals, ceramic materials and graphite, and an aqueous surfactant solution or low boiling liquid oils and fats to at least part of the surface of a metallic mold on its cavity side, then applying heat to the coated portion to thus adhere the mixture to the inner surface of the mold, and thereafter repeatedly casting a magnesium alloy in the metallic mold provided with the coating layer. The metallic mold-casting method permits the metallic mold casting of magnesium alloys with good resistance to penetration and this accordingly leads to the production of a cheap and high quality cast magnesium alloy product.

Abstract: A metallic mold-casting method excellent in the resistance to penetration is herein disclosed and the method comprises the steps of forming a coating layer by applying a mixture comprising at least one member selected from the group consisting of high melting metals, ceramic materials and graphite, and an aqueous surfactant solution or low boiling liquid oils and fats to at least part of the surface of a metallic mold on its cavity side, then applying heat to the coated portion to thus adhere the mixture to the inner surface of the mold, and thereafter repeatedly casting a magnesium alloy in the metallic mold provided with the coating layer. The metallic mold-casting method permits the metallic mold casting of magnesium alloys with good resistance to penetration and this accordingly leads to the production of a cheap and high quality cast magnesium alloy product.