粉末高速度工具鋼の一次炭化物の分布形態と二,三の機械的性質について

概要

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The characteristics of heat treatment and mechanical properties in PM high speed steel fluctuate with primary carbide size. The effect of primary carbide size on carbide distribution and morphology, quenching and tempering characteristics, mechanical properties such as bend fracture strength and wear resistance was studied in 5%Mo-6%W-3% V-8.5%Co and 6%Mo-14%W-5%V-12%Co type PM high speed steels.As a result, it was confirmed that annealed hardness, tempered hardness, bend fracture strength and wear resistance were significantly affected by primary carbide size. Annealed hardness and tempered hardness decrease with coarsening of primary carbide. The dependance of bend fracture strength and wear resistance on primary carbide size is greatly changed by the amount of alloy elements such as Mo, W, V, and the quenching temperature.Primary carbides are composed of MC and M6C type carbide. Their distribution ratio and area fraction are not affected by primary carbide size. Mean diameter of primary carbide, D(μm), is directly Proportional to maximum carbide size, Dmax(μm), following equation: D=0.27+0.31Dmax.
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