7Cr17Mo马氏体不锈钢组织和冲击韧性Microstructure and impact toughness of 7Cr17Mo martensitic stainless steel
宋自力,杜晓东,陈翌庆,王家庆,叶诚,李连颖
摘要(Abstract):
采用光学显微镜(OM)、扫描电子显微镜(SEM)、洛氏硬度计、冲击试验机等观察和分析了7Cr17Mo马氏体不锈钢在980~1110℃不同温度淬火下的组织特征和性能变化。结果表明,淬火组织为残留奥氏体和碳化物分布于隐针马氏体基体上,碳化物以(Fe,Cr)23C6为主。随着淬火温度的升高,残留奥氏体含量增加,马氏体过饱和度增加,针状马氏体组织变粗,1060℃时硬度升高到最大值59 HRC。冲击试验结果表明在980~1080℃淬火时,随淬火温度升高,冲击韧性提高,1080℃时冲击韧性最好,其后下降。SEM断口形貌表明室温下冲击断裂方式为微孔聚集型断裂。
关键词(KeyWords): 马氏体不锈钢;淬火温度;显微组织;冲击韧性
基金项目(Foundation): 广东省教育部产学研结合项目(2009A090100045);; 科技部创新基金(09C26213404170);; 安徽省教育厅自然科学重点项目(KJ2009A094)
作者(Author): 宋自力,杜晓东,陈翌庆,王家庆,叶诚,李连颖
DOI: 10.13289/j.issn.1009-6264.2011.05.019
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