佟倩,吴晓春,周青春,闵娜

• 1:上海大学材料科学与工程学院

摘要(Abstract)：

采用自约束热疲劳试验方法,对比研究了SDH3与H13钢的热疲劳性能,应用扫描电镜研究了SDH3热疲劳过程中裂纹的萌生和扩展,应用透射电镜分析了SDH3钢热疲劳前后显微组织和结构的变化。结果表明:经常规热处理后,SDH3钢热疲劳性能优于H13钢;对SDH3钢来讲,热疲劳裂纹由三叉晶界处萌生,并沿晶界扩展;SDH3钢的马氏体板条间存在薄膜状残留奥氏体,可有效释放裂纹尖端的应力并阻碍裂纹扩展;热疲劳过程中,基体组织发生回复再结晶,碳化物粒子发生粗化。

关键词(KeyWords)： 热作模具钢;热疲劳机理;微观结构

Abstract:

Keywords:

基金项目(Foundation): 国家科技支撑计划课题(2007BAE51B04);; 宝山钢铁股份有限公司项目

作者(Author): 佟倩,吴晓春,周青春,闵娜

DOI: 10.13289/j.issn.1009-6264.2010.05.029

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