金传伟,张继明,吴园园

• 1:江苏省(沙钢)钢铁研究院

摘要(Abstract)：

利用聚焦离子束(FIB)刻蚀方法精确制备了针状铁素体X65管线钢的马奥岛(MA)薄膜样品，随后采用电子背散射衍射(EBSD)技术和透射电镜(TEM)对MA岛的亚结构进行了表征，并研究了MA岛在疲劳裂纹扩展中的作用。结果表明，针状铁素体X65管线钢中MA含量约为5.7%,MA岛主要弥散分布在晶界处，尺寸≤3μm。MA岛内部亚结构被马氏体和残留奥氏体分割为大小不等的块区，残留奥氏体与马氏体相互交错分布，一些区域马氏体与奥氏体存在共格关系。MA岛内部残留奥氏体与马氏体交错分布的特征对疲劳裂纹扩展具有显著的抑制作用，当疲劳裂纹扩展路径遇到MA岛时，主裂纹扩展方向发生偏折，并绕过MA岛，而支裂纹则被MA岛所捕获，停止扩展。

关键词(KeyWords)： 管线钢;MA岛;残留奥氏体;共格关系;疲劳裂纹扩展

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 金传伟,张继明,吴园园

DOI: 10.13289/j.issn.1009-6264.2022-0574

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