20MnCr5钢中马氏体回火的EBSD研究

材料热处理学报, 2011, 32(1): 43-48.

20MnCr5钢中马氏体回火的EBSD研究

王申存 ^1, , 吴益文 ^2, , 华沂 ^3, , 李志成 ^4, , 张鸿 ^5,

1.中南大学材料科学与工程学院,湖南,长沙,410083

2.上海出入境检验检疫局工业品与原材料检测技术中心,上海,200135

3.上海出入境检验检疫局工业品与原材料检测技术中心,上海,200135

4.中南大学材料科学与工程学院,湖南,长沙,410083

5.中南大学材料科学与工程学院,湖南,长沙,410083

基金项目: 高校博士点专项科研基金(20070533119) 中国博士后科学基金(20080431030)的资助) 国家质检公益行业科研专项(2007GYJ028) 国家自然科学基金(50872155)

关键词： 20MnCr5钢 , 电子背散射衍射 , 马氏体变体 , 取向关系 , 回火

Investigation of tempered martensite in 20MnCr5 steel by EBSD

利用金相显微镜和扫描电镜中的电子背散射衍射(EBSD)技术研究了不同条件回火处理后20MnCr5钢中马氏体及其变体的取向关系变化情况.选择各试样取向成像图中原奥氏体晶粒区域做出相应的马氏体{110}a极图,并根据Kurdjumov-Sachs(K-S)关系和Nishiyama-Wassermann(N-W)关系,使用数值拟合方法分别对各极图进行拟合.结果表明,20MnCr5钢经淬火并低温回火后得到的马氏体取向关系主要为N-W关系,也有K-S关系存在.再经350℃或500℃保温处理后,钢中马氏体取向关系没有明显改变,但原奥氏体晶粒中马氏体变体数目有减少趋势.

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