The Hot Extrusion of Metal Powder Preforms

Vacancies are introduced into the crystal phase during quenching of rapid solidified materials. Cavity formation occurs because of the coalescence of the vacancies into a cluster. However, because of the high mobility of vacancies at high temperature, most of them will diffuse back into the liquid phase, and some will be lost to defects such as dislocations. Oxygen is known to stabilize cavities by decreasing the surface energy through a chemisorption process. These stabilized cavities, furthermore, act as effective nucleation sites for precipitates to form during aging. Four different types of powders with different oxygen contents were prepared by gas atomization processing. The atomized powders were then consolidated by hot extrusion at 900 °C with an extrusion ratio 10,5:1. After consolidation, specimens were heat treated at 1000 °C for 1 hr followed by water quenching. Finally, the specimens were aged at 600 °C for about 800 hrs. TEM samples were prepared from the gripends of tensile specimens of both unaged and aged alloys.

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MUSTANG-LC

Alloy Digest ◽

10.31399/asm.ad.ts0192 ◽

1967 ◽

Vol 16 (4) ◽

Keyword(s):

Physical Properties ◽

High Speed ◽

High Speed Steel ◽

Hot Extrusion ◽

Heat Treating ◽

Hot Forming ◽

Steel Company ◽

Extrusion Dies ◽

Die Life

Abstract Mustang-LC is a tungsten-molybdenum high-speed steel specially developed for hot work applications requiring long die life. It is recommended for hot forming and swaging dies, hot extrusion dies, hot punches, etc. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, and joining. Filing Code: TS-192. Producer or source: Jessop Steel Company.

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UNS T20819

Alloy Digest ◽

10.31399/asm.ad.ts0496 ◽

1989 ◽

Vol 38 (2) ◽

Keyword(s):

Elevated Temperatures ◽

Hot Extrusion ◽

Heat Treating ◽

High Toughness ◽

Extrusion Dies ◽

Extrusion Die ◽

Steel Mills ◽

Temperature Performance ◽

Heat Checking ◽

Resistance To Heat

Abstract UNS T20819 is a hot-work tool and die steel that is characterized by excellent resistance to shock and abrasion at elevated temperatures. This steel provides relatively high toughness and outstanding resistance to heat checking and softening at elevated temperatures. Among its many applications are hot-punch tools, forging dies and inserts, brass extrusion dies, permanent molds for brass casting and hot-extrusion die inserts for steel. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-496. Producer or source: Tool steel mills.

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ANCORSTEEL 4600V

Alloy Digest ◽

10.31399/asm.ad.sa0655 ◽

2012 ◽

Vol 61 (6) ◽

Keyword(s):

Fracture Toughness ◽

Physical Properties ◽

Tensile Properties ◽

Metal Powder ◽

Heat Treating ◽

Powder Metal

Abstract Ancorsteel 4600V alloy is a water-atomized low-alloy sinter-hardening metal powder. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on heat treating and powder metal forms. Filing Code: SA-655. Producer or source: Hoeganaes Corporation.

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