摘要
本文应用TEM仔细观察研究了碳工钢激光淬火时的“自回火”现象,发现T10A经激光淬火后,在激光峰值硬化区内存在大量细小弥散的碳化物(Fe_3C)沿位错线及孪晶界的析出,它们的大小为几个nm至10nm,且与马氏体基体具有BhagaryatskQ取向关系。在实验的基础上,分析讨论了碳化物析出的热力学和动力学条件。TEM观察研究表明,碳化物析出的“自回火”现象的存在,是碳工钢激光淬火时,在组织上区别于常规淬火的重要特征。
This paper investigates the self-tempering of laser-hardened carbon tool steelsr by means of TEM. It has been found that there are a great deal of precipitation of boundaries in the maximun hardened region of T10A treated with laser hardening. The precipitated carbides, ranged from Inm to 10nm,have the Bhagaryatsku's orientation relation with a matrix of martensite. Based on the results, thermodynamic and dynamic conditions of the precipitation have also been analysed, Many observations show that the characteristic difference in micro-structures between TIOA steels treated with laser hardening and those,with traditional hardening indicates the existence of precipitation of carbides is a result of the self-tempering.
出处
《中国激光》
EI
CAS
CSCD
北大核心
1992年第11期865-868,共4页
Chinese Journal of Lasers
关键词
激光淬火
相变硬化
碳工钢
淬火
laser transformation hardening, laser heat treatment
