Abstract We describe here the distinct high cycle fatigue properties of advanced bainitic steels to elucidate the significant role of retained austenite with different morphologies on sub-surface fatigue crack initiation process. The inter-plate film-like retained austenite at the straight front of small crack tip transformed to martensite, leading to the arrest of small crack growth and altered the active slip systems. However, the blocky retained austenite or martensite/austenite islands located at prior austenite grain boundaries induced intergranular fatigue cracking because of ease of activation of slip in retained austenite.

中文翻译：

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不同形貌残余奥氏体对先进贝氏体钢亚表面疲劳裂纹萌生的作用

摘要 我们在这里描述了先进贝氏体钢独特的高周疲劳性能，以阐明具有不同形态的残余奥氏体在次表面疲劳裂纹萌生过程中的重要作用。小裂纹尖端直线前端的板间膜状残余奥氏体转变为马氏体，导致小裂纹扩展停止并改变了主动滑移系统。然而，位于原奥氏体晶界的块状残余奥氏体或马氏体/奥氏体岛会导致晶间疲劳开裂，因为残余奥氏体中的滑移易于激活。