【摘要】 研制的２５Ｗ３Ｍｏ４Ｃｒ２Ｖ７Ｃｏ５高初高硬高速钢的共晶碳化物尺寸平均为２～４μｍ，最大约为８μｍ；经最佳规范过饱和渗碳后碳化物尺寸平均为４～６μｍ，最大亦仅为１０μｍ。热处理后的硬度可达ＨＲＣ６７～７０，用该钢制造的车刀，其耐用度显著高于Ｗ１８Ｃｒ４Ｖ钢。更多还原

【Abstract】 The average particle size of eutectic carbides in the new high toughness and hardness high speed steel 25W3Mo4CrZV7Co5 developed was 2～4 pm, and the maximum particle size was 6～8μm.The average particle size of carbides in the steel overcarburized was 4～6 μm, and the maximum was about 10μm. The service life of lathe tools made of steel 25W3Mo4CrZV7Co5 heat treated with HRC67～70 was evidently longer than that of the tools made of the steel W18Cr4V.更多还原