Abstract
High speed steels (JIS SKH51) have been produced by sinter forging using high-pressure water atomized powders ( ?? 10μm). The mechanical properties such as bend strength and hardness have been measured and optical and electron microscopic observation have been carried out. The properties of the forged steels have been compared with those of conventional sinterd steels. The results obtained can be summarized as follows:1) The grain of sinter-forged high speed steels is very fine and carbides ( ?? 1μm) distributed uniformly are observed.2) Carbide particle size is dependent upon powder size and sintering temperature, but not upon austenitizing temperature.3) Bend strength of sinter forged steels is 450kg/mm2, whereas that of conventional products is 200kg/mm2.
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