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研究了喷射成形高速钢在热处理过程中碳化物的演变。结果表明,使用喷射成形工艺生产高速钢可消除偏析,获得均匀微观组织和碳化物分布,喷射态组织由片状M2C碳化物和均匀分布的球形MC碳化物组成。锻造退火后,亚稳态M2C碳化物完全分解为M6C和MC碳化物。淬火后组织为马氏体、残留奥氏体与未溶碳化物,高温回火后,大量细小弥散的二次碳化物从基体中析出,产生二次硬化效应,使材料具有极高硬度和良好冲击韧性。热处理后喷射成形高速钢具有优异的使用性能。
The evolution of carbides during the heat treatment of spray-formed HSS was investigated. The results show that the use of spray forming process to produce high-speed steel can eliminate segregation and obtain uniform microstructure and carbide distribution. The sprayed structure consists of flaky M2C carbides and uniformly distributed spherical MC carbides. After forging annealing, metastable M2C carbides completely decompose to M6C and MC carbides. After quenching the organization for the martensite, retained austenite and undissolved carbides, high temperature tempering, a large number of fine secondary carbides dispersed from the matrix precipitation, resulting in secondary hardening effect, so that the material has a very high hardness and good Impact toughness. After injection heat treatment, HSS has excellent serviceability.