摘要
利用OM、SEM、X射线衍射等试验手段对Cr12MoV钢的原始组织、淬火冷却过程中奥氏体晶粒大小、碳化物形态、马氏体及残余奥氏体分解等方面进行了综合分析,研究了一次、二次硬化工艺下钢的强韧化机理。结果表明:一次硬化工艺(淬火+低温回火)可以通过较低的淬火加热温度得到细小的奥氏体晶粒、较少的残余奥氏体和较高的淬火硬度;二次硬化工艺宜采用较高的淬火温度获得合金化程度较高的奥氏体,这对马氏体的高抗回火软化能力、马氏体和残余奥氏体中特殊碳化物的析出强化以及残余奥氏体二次淬火强化等有重要作用。1050℃淬火+550℃两次回火工艺可获得最佳的强韧性。
The original microstmcture,and the anstenite grain size,the carbide morphology,the decomposition of martensite and retained austenite of Crl2MoV steel in quenching cooling were comprehensively analyzed by using OM, SEM and X-ray diffraction. The mechanism of strengthening and toughening of the steel under process of first and secondary hardening was studied. The results indicate that： first hardening process （quenching and low temperature tempering） can obtain the fine austenite grain, the less residual austenite and the higher quenching hardness through the low quenching temperature. Secondary hardening technology is suitable for the higher quenching temperature to obtain austenite of higher alloying degree. This has important effect on the ability of high anti-tempering softening of the martensitc, the precipitation strengthening of special carbides in the martensite and retained austenite, and tlie secondary hardening of the retained anstenite. The strength and toughness can be obtained by 1050℃ quenching and 550 ℃tempering twice.
出处
《热加工工艺》
CSCD
北大核心
2016年第8期213-216,220,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(50971067)
关键词
Cr12Mo
V
钢
强韧性
二次硬化
Crl2MoV steel
strength and toughness
secondary haTdening
