孟丽君,庞淦文,邢辉,孙坚

• 1:上海交通大学材料科学与工程学院

摘要(Abstract)：

研究了固溶处理AL6XN超级奥氏体钢在温度773～973K以及3.3×10-5～3.3×10-3s-1应变速率范围的高温拉伸力学行为。结果表明,AL6XN奥氏体钢在以上实验条件下(不包括873K,3.3×10-5s-1)均存在动态应变时效,具体表现为在真应力-真应变曲线上出现锯齿形,同时屈服强度在773～973K范围呈现平台区;临界应变量随着温度从773K升高到923K逐渐降低,并且在此温度范围激活能为304kJ/mol,说明动态应变时效的机制为AL6XN奥氏体钢中Cr和Mo等置换原子与位错的交互作用。透射电镜分析同时表明AL6XN奥氏体钢形变后位错结构呈平面滑移特征。

关键词(KeyWords)： AL6XN奥氏体钢;高温变形;溶质原子;动态应变时效

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展计划(973)项目(2007CB209803)

作者(Author): 孟丽君,庞淦文,邢辉,孙坚

DOI: 10.13289/j.issn.1009-6264.2010.04.011

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