Abstract: A method for producing a hollow part made of a metal material, includes preparing a blank of the metal material, and at least a sacrificial mandrel made of a material which has a yield stress in the range from ?30% to +20% of the yield stress of the material of the blank; applying a punch on at least one of the ends of the blank in order to produce the expansion of at least a portion of said blank and to create at least one internal space inside said blank; inserting a sacrificial mandrel in said an internal space of the blank; crimping the sacrificial mandrel in said blank; producing, by co-forging, a simultaneous deformation of said blank and of said sacrificial mandrel, with a homothetic ratio K; and performing a machining in order to remove the sacrificial mandrel.

Abstract: A method for manufacturing turbomachine disks is provided. The method includes: providing a nickel alloy powder; and shaping the powder to obtain a disk. Providing a powder can include: manufacturing a nickel alloy electrode by PAM-CHR; atomizing a nickel alloy by EIGA from the nickel alloy electrode, leading to a raw powder; and sifting the raw powder under inert atmosphere or under vacuum with a granulometric cut-off between 150 ?m and 50 ?m, leading to the nickel-based alloy powder. In some examples, the granulometric cut-off can be between 125 ?m or 75 ?m.

Abstract: A nickel superalloy has the following composition, the concentrations of the different elements being expressed as wt-%: Formula (I), the remainder consisting of nickel and impurities resulting from the production of the superalloy. In addition, the composition satisfies the following equation, wherein the concentrations of the different elements are expressed as atomic percent: Formula (II).

Abstract: A method for manufacturing an aircraft door with an integral structure. The method includes the following steps: producing a forged blank (7); die-cutting the forging blank (7) between a substantially smooth lower die (8) and an upper die (9) defining a plurality of cells and producing a die-cut part having a honeycomb structure having an open face and a closed face closed by a wall; an inner wall of the honeycomb structure is machined to define at least one recess defined by a web connecting the closed face and the open face and a base protruding substantially perpendicular to the web on the open face of the die cut component.

Abstract: Method for manufacturing an aircraft door having a monolithic structure, including the following steps: producing a forged blank; die-cutting the forged blank between a substantially smooth lower die and an upper die defining cells, and producing a die-cut part with a cellular structure having an open face and a face closed by a wall; machining the internal walls of the cellular structure to define at least one recess delimited by a web connecting the closed face and the open face and by a base projecting substantially perpendicular to the web, on the open face of the die-cut part.

Abstract: A nickel superalloy has the following composition, the concentrations of the different elements being expressed as wt-%: Formula (I), the remainder consisting of nickel and impurities resulting from the production of the superalloy. In addition, the composition satisfies the following equation, wherein the concentrations of the different elements are expressed as atomic percent: Formula (II).

Abstract: The present invention relates to a steel composition carburizable and/or nitritable, comprising, in percentages by weight of the total composition: Carbon: 0.05-0.40, preferably 0.10-0.30; Chromium: 2.50-5.00, preferably 3.00-4.50; Molybdenum: 4.00-6.00; Tungsten: 0.01-1.80, preferably 0.02-1.50; Vanadium: 1.00-3.00, preferably 1.50-2.50; Nickel: 2.00-4.00; Cobalt: 2.00-8.00, preferably 3.00-7.00; Iron: balance as well as the inevitable impurities, optionally further comprising one or more of the following elements: Niobium: ?2.00; Nitrogen: ?0.50, preferably ?0.20; Silicon: ?0.70, preferably 0.05-0.50; Manganese: ?0.70, preferably 0.05-0.50; Aluminum: ?0.15, preferably ?0.10; the combined niobium+vanadium content being in the range 1.00-3.50; and the carbon+nitrogen content being in the range 0.05-0.50. It further relates to the method of production thereof, the steel blank obtained and a mechanical device comprising the latter.

Abstract: The present invention relates to a steel composition, to the process for manufacturing same, to the steel blank obtained having a hardness of between 46 and 48 HRC and a resilience KV at ?40° C. of at least 40 joules, and to the use thereof for manufacturing a pressure appliance component.

Abstract: A carburisable steel alloy suitable for bearing components comprising, in percent by weight: C 0.05-0.5 wt. % Cr 2.5-5.0 wt. %, Mo 4-6 wt. %, W 2-4.5 wt. %, V 1-3 wt. %, Ni 2-4 wt. %, Co 2-8 wt. %, optionally one or more of the following elements: Nb 0-2 wt. % N 0-0.5 wt. % Si 0-0.7 wt. %, Mn 0-0.7 wt. %, Al 0-0.1 5 wt. %, wherein the combined amount of Nb+V is within the range 1-3.5 wt. %, the combined amount of C+N is within the range 0.05-0.5 wt. %, the balance being Fe and unavoidable impurities.

Abstract: The tool according to the invention comprises a connecting head (22) support (70) extending along a longitudinal axis (B-B?); a mold base (72), supported by the support (70), the mold base (72) defining an axial orifice for passage of the connecting head (22); an end-piece (74) for mounting the support (70) on a movement member for moving the tool in the mold; and a mechanism (76) for longitudinal immobilization of the connecting head (22) on the support (70). The mechanism (76) for longitudinal immobilization is longitudinally adjustable relative to the support (70) in order to immobilize the connecting head (22) relative to the support (70) in at least two different longitudinal positions along the longitudinal axis (B-B?).

Abstract: A martensitic stainless steel is provided, wherein its composition is: trace amounts?C?0.030%; trace amounts?Si?0.25%; trace amounts?Mn?0.25%; trace amounts?S?0.020%; trace amounts?P?0.040%; 8%?Ni?14%; 8%?Cr?14%; 1.5%?Mo+W/2?3.0%; 1.0%?Al?2.0%; 0.5%?Ti?2.0%; 2%?Co?9%; trace amounts?N?0.030%; trace amounts?O?0.020%; the remainder being iron and impurities resulting from the steelmaking; and its martensitic transformation beginning temperature Ms is calculated by the formula Ms (° C.)=1302?28Si?50Mn?63Ni?42Cr?30Mo+20Al?12Co?25Cu+10[Ti?4(C+N)]??(1) wherein the contents of the various elements are expressed in weight percentages, is greater than or equal to 50° C., preferably greater than or equal to 75° C. A part made in this steel and its manufacturing method are also provided.

Abstract: The invention relates to a method of producing a martensitic steel comprising a content of other metals such that it can be hardened by intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%. The heat shaping temperature of the last heat shaping pass of said steel is lower than the solubility temperature of the aluminum nitrides in the steel, and the treatment temperature for each potential heat treatment after said last heat shaping pass is lower than the solid-state solubility temperature of the aluminum nitrides in said steel.

Abstract: The invention concerns a method for making a unitary spark ignition valve, characterized in that it consists in preparing and casting a steel made up in wt. % of: 0.45%?C 0.55%; 12%?Cr?18%; 1%?Si?2.5%; traces?Mn?2%; 0.2%?V?0.5%; traces?Mo?0.5%; 0.05%?N?0.15%, with 0.55%?C+N?0.70%; traces?Ni?1%; traces?Cu?0.25%, or Cu?0.5 Ni if Cu>0.25%; traces?Co?1%; traces?W?0.2%; traces?Nb?0.15%; traces?AI?0.025%; traces?Ti?0.010%; traces?S?0.030%; traces?P?0.040%; traces?B?0.0050%; the balance being iron and impurities resulting from the preparation; in transforming by hot thermomechanical process, for example, by rolling and/or forging between 1000 and 1200° C.; optionally soft annealing, between 650 and 900° C.

Abstract: A steel characterized in that its composition is percentages by weight: C=0.18-0.30% Co=1.5-4% Cr=2-5% Al=1-2% Mo+W/2=1-4% V=traces-0.3% Nb=traces-0.1% B=traces-30 ppm Ni=11-16% where Ni?7+3.5 Al Si=traces-1.0% Mn=traces-2.0% Ca=traces-20 ppm Rare earths=traces-100 ppm if N?10 ppm, Ti+Zr/2=traces-100 ppm where Ti+Zr/2?10 N if 10 ppm<N?20 ppm, Ti+Zr/2=traces-150 ppm O=traces-50 ppm N=traces-20 ppm S=traces-20 ppm Cu=traces-1% P=traces-200 ppm the remainder being iron and inevitable impurities resulting from the smelting. A process for manufacturing a part from this steel, and part thus obtained.

Abstract: Steel, characterized in that the composition thereof is, in percentages by weight: C=0.20-0.30% Co=trace levels-1% Cr=2-5% Al=1-2% Mo+W/2=1-4% V=trace levels-0.3% Nb=trace levels-0.1% B=trace levels-30 ppm Ni=11-16% with Ni?7+3.5 Al Si=trace levels-1.0% Mn=trace levels-2.0% Ca=trace levels-20 ppm rare earths=trace levels-100 ppm if N?10 ppm, Ti+Zr/2=trace levels-100 ppm with Ti+Zr/2?10 N if 10 ppm<N?20 ppm, Ti+Zr/2=trace levels-150 ppm O=trace levels-50 ppm N=trace levels-20 ppm S=trace levels-20 ppm Cu=trace levels-1% P=trace levels-200 ppm the remainder being iron and inevitable impurities resulting from the production operation. Method of producing a component from this steel and a component obtained in this manner.

Abstract: A method for preparing a part in nickel-based superalloy is disclosed. The method comprises the following steps: elaborating a nickel-based superalloy with a composition capable of providing hardening by double precipitation of a gamma? phase and of a gamma? or delta phase; atomizing a melt of the superalloy in order to obtain a powder; sifting the powder; introducing the powder into a container; closing and applying vacuum to the container; densifiying the powder and the container in order to obtain an ingot or a billet; hot forming said ingot or said billet; wherein before the densification step, the powder and the container are heated for at least 4 hrs, at a temperature both above 1,140° C. and at least 10° C. less than the solidus temperature of the superalloy, and at a pressure causing densification of less than or equal to 15% of the powder volume.

Abstract: The invention relates to a method of producing a martensitic steel comprising a content of other metals such that it can be hardened by intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%. The heat shaping temperature of the last heat shaping pass of said steel is lower than the solubility temperature of the aluminum nitrides in the steel, and the treatment temperature for each potential heat treatment after said last heat shaping pass is lower than the solid-state solubility temperature of the aluminum nitrides in said steel.

Abstract: A method of producing a martensitic steel including a content of other metals such that it can be hardened by intermetallic compound and carbide precipitation, with an Al content of between 0.4% and 3%. The heat shaping temperature of a last heat shaping pass of the steel is lower than the solubility temperature of aluminum nitrides in the steel, and a treatment temperature for each potential heat treatment after the last heat shaping pass is lower than the solid-state solubility temperature of the aluminum nitrides in the steel.

Abstract: The invention relates to a manufacturing process for steel blanks. The invention relates in particular to a manufacturing process of a steel blank comprising electroslag remelting (ESR—ElectroSlag Remelting) or vacuum arc remelting (VAR—Vacuum Arc Remelting) to obtain very good mechanical properties. The blanks obtained can be used especially in the field of the manufacture of pressurized equipment elements and especially cannon tubes.

Abstract: The invention relates to a process for the preparation of a part made of titanium alloy, comprising a thermal treatment for relaxing the internal stresses of the part, the thermal treatment comprising maintaining at a temperature “T1” greater than the beta transus (beta transition) temperature, referred to as “Tbt”, and the part being free to deform by creeping. The invention also relates to a tool for carrying out this process.