李辉,史航旭,李艳梅

• 1:数字钢铁全国重点实验室

摘要(Abstract)：

超低温工程装备在服役过程中常受循环载荷，易发生疲劳损伤时效，因此提高其抗疲劳性能成为研究的重点。奥氏体相作为马氏体时效钢中的关键相，其含量和稳定性对其疲劳性能具有显著影响。对不同奥氏体相含量的马氏体时效钢进行疲劳性能测试，利用扫描电镜(SEM)、X射线衍射(XRD)和透射电镜(TEM)等表征了实验钢疲劳实验前后的组织及相组成，分析了奥氏体相对实验钢疲劳裂纹扩展的作用机制。结果表明：当奥氏体相含量为50%时，实验钢的疲劳寿命最佳，这主要是由于奥氏体发生相变诱导塑性(TRIP)效应转变为马氏体组织，延迟了裂纹扩展速率，导致裂纹尖端闭合，阻碍了裂纹扩展，同时条状奥氏体对裂纹扩展的直接阻碍作用，两者共同作用提高了实验钢的疲劳寿命。

关键词(KeyWords)： 奥氏体;塑性变形;裂纹扩展;马氏体钢;疲劳性能

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2022YFB3705300);; 国家自然科学基金重点项目(U23A20613)

作者(Author): 李辉,史航旭,李艳梅

DOI: 10.13289/j.issn.1009-6264.2025-0120

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