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用金相分析方法研究了26Cr2Ni4MoV钢马氏体组织等温加热的奥氏体化过程,及其对完全奥氏体化后晶粒遗传程度的影响。研究结果表明,马氏体组织加热时,有形成片状和球状两种奥氏体化过程。片状奥氏体具有恢复母相位向的能力,在得到充分发展时,完全奥氏体化后即促成晶粒遗传。本文探讨了这一过程产生的原因,并讨论了加热速度、钢的成分、预回火、过热程度对晶粒遗传性的影响,提出了防止与消除晶粒遗传的几种途径。
The austenitization process of martensite in 26Cr2Ni4MoV steel by isothermal heating was studied by metallographic analysis and its influence on the degree of genetic inheritance after complete austenitization. The results show that when the martensite is heated, there are two types of austenitization processes, flake and sphere. Flake austenite has the ability to restore the mother phase to the full development of fully austenitic to promote grain inheritance. This paper explores the causes of this process and discusses the effects of heating rate, steel composition, pre-tempering and overheating on the inheritance of grains and several approaches to prevent and eliminate the inheritance of grains.