热处理工艺对20SiMn钢晶粒细化作用的机理研究  

Study on the mechanism of heat treatment process effect on 20SiMn steel grain refinement

作　　者：孙海明[1] SUN Haiming(Electric Power Research Institute of State Grid Heilongjiang Electric Power Co. , Ltd. , Harbin 150030, China)

机构地区：[1]国网黑龙江省电力有限公司电力科学研究院,哈尔滨150030

出　　处：《黑龙江电力》2017年第3期279-282,共4页Heilongjiang Electric Power

摘　　要：为了研究热处理工艺对20SiMn钢晶粒细化过程中的作用,选取了9个试样进行不同工艺的热处理和化学试剂热浸蚀试验,分析了热处理试验结果。试验结果表明,热处理过程中NbC的析出可以起到钉扎位错的作用,不但使组织得到强化,而且使原奥氏体晶粒得到了一定的细化,避免了混晶现象的出现。通过热浸蚀试验可以较好地显示出原奥氏体晶界,观察原奥氏体晶粒细化程度。In order to study the effect of heat treatment process on the grain refinement of 20SiMn steel, 9 samples are selected for different types of heat treatment processes and thermal etching test on chemical reagent and test re- sults for heat treatment are analyzed. The results show that the precipitation of NbC during the heat treatment can play a role in pinning dislocation As a result, not only the structure is strengthened, but also the original austenite grain is refined. Also, the precipitation avoids the emergence of mixed crystal phenomenon. The thermal etching test can be a good show of the original austenite grain boundary, so as to observe the original austenite grain refine- ment .

关 键 词：化学热浸蚀 原奥氏体晶界 仿晶界型铁素体 

分 类 号：TG115.213[金属学及工艺—物理冶金]