The atomization device comprises a motor (1) rotatably driving a spinning disc (2) by means of a rotating shaft (3), and cooling means for cooling said spinning disc (2), wherein said cooling means comprise a cooling circuit (4) extending around at least one portion of the rotating shaft (3) and below at least one portion of said spinning disc (2). The invention allows providing an atomization device in which the rotating shaft of the motor is perfectly aligned with the spinning disc, thereby avoiding the use of mechanical transmission elements.

Disclosed are a device and method for continuously performing grain boundary diffusion and heat treatment, characterized in that the alloy workpiece or the metal workpiece are arranged in a relatively independent processing box together with a diffusion source; the device comprises, in successive arrangement, a grain boundary diffusion chamber, a first cooling chamber, a heat treatment chamber, and a second cooling chamber, and a transfer system provided between various chambers for delivering the processing box; each of the first cooling chamber and the second cooling chamber uses an air cooling system, and the cooling air temperature of the first cooling chamber is above 25° C. and at least differs by 550° C. from the grain boundary diffusion temperature of the grain boundary diffusion chamber; the cooling air temperature of the second cooling chamber is above 25° C. and at least differs by 300° C. from the heat treatment temperature of the heat treatment chamber; and the cooling chamber has a pressure of 50 kPa to 100 kPa. The device provided by the present invention can increase the cooling rate and production efficiency, and improve product consistency.

Disclosed are a device and method for continuously performing grain boundary diffusion and heat treatment, characterized in that the alloy workpiece or the metal workpiece are arranged in a relatively independent processing box together with a diffusion source; the device comprises, in successive arrangement, a grain boundary diffusion chamber, a first cooling chamber, a heat treatment chamber, and a second cooling chamber, and a transfer system provided between various chambers for delivering the processing box; each of the first cooling chamber and the second cooling chamber uses an air cooling system, and the cooling air temperature of the first cooling chamber is above 25° C. and at least differs by 550° C. from the grain boundary diffusion temperature of the grain boundary diffusion chamber; the cooling air temperature of the second cooling chamber is above 25° C. and at least differs by 300° C. from the heat treatment temperature of the heat treatment chamber; and the cooling chamber has a pressure of 50 kPa to 100 kPa. The device provided by the present invention can increase the cooling rate and production efficiency, and improve product consistency.

The present invention relates to a Fe-based alloy for melt-solidification-shaping containing : 0.05 mass% ≤ C ≤0.25 mass%, 0.01 mass% ≤ Si ≤ 2.0 mass%, 0.05 mass% ≤ Mn ≤ 2.5 mass%, 2.5 mass% ≤ Ni ≤ 9.0 mass%, 0.1 mass% ≤ Cr ≤ 8.0 mass%, and 0.005 mass% ≤ N ≤ 0.200 mass%, with the balance being Fe and unavoidable impurities, and satisfying: 11.5 < 15C+Mn+0.5Cr+Ni < 20.

The present invention relates to a Fe-based alloy for melt-solidification-shaping containing : 0.05 mass% ≤ C ≤0.25 mass%, 0.01 mass% ≤ Si ≤ 2.0 mass%, 0.05 mass% ≤ Mn ≤ 2.5 mass%, 2.5 mass% ≤ Ni ≤ 9.0 mass%, 0.1 mass% ≤ Cr ≤ 8.0 mass%, and 0.005 mass% ≤ N ≤ 0.200 mass%, with the balance being Fe and unavoidable impurities, and satisfying: 11.5 < 15C+Mn+0.5Cr+Ni < 20.

An object of the present invention is to provide an additive manufactured object which is free of solidification cracking due to, e.g., heat shrinkage during additive manufacturing of an aluminum alloy; which is free of anisotropy in strength, and has high strength and ductility. An aluminum alloy powder for additive manufacturing includes aluminum alloy particles in which not less than 0.01% by mass and not more than 1% by mass of a grain refiner is trapped. This grain refiner is at least one selected from the borides and carbides of group 4 elements.

An object of the present invention is to provide an additive manufactured object which is free of solidification cracking due to, e.g., heat shrinkage during additive manufacturing of an aluminum alloy; which is free of anisotropy in strength, and has high strength and ductility. An aluminum alloy powder for additive manufacturing includes aluminum alloy particles in which not less than 0.01% by mass and not more than 1% by mass of a grain refiner is trapped. This grain refiner is at least one selected from the borides and carbides of group 4 elements.

A method for obtaining a lead-free or low lead content brass billet subjects a mixture of lead-free or low lead content brass chips and graphite powder to extrusion, either direct or inverted. The method obtains lead-free or low lead content brass billets.

A method for obtaining a lead-free or low lead content brass billet subjects a mixture of lead-free or low lead content brass chips and graphite powder to extrusion, either direct or inverted. The method obtains lead-free or low lead content brass billets.

A method for obtaining a lead-free or low lead content brass billet subjects a mixture of lead-free or low lead content brass chips and graphite powder to extrusion, either direct or inverted. The method obtains lead-free or low lead content brass billets.