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材料工程  2013 

E550海洋平台用钢二次裂纹扩展机理研究

DOI: 10.3969/j.issn.1001-4381.2013.06.007, PP. 35-39

Keywords: 海洋平台用钢,二次裂纹,EBSD

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Abstract:

利用光学显微镜和背散射电子衍射技术对E550海洋平台用钢二次裂纹扩展机理进行了研究,同时对二次裂纹周边的晶粒取向进行了分析。结果表明钢中的二次裂纹扩展方式与相邻晶粒滑移面的夹角密切相关,其中40%左右的小角度夹角对裂纹扩展影响较小,另外40%左右的相邻晶粒滑移面的夹角为50~62°的大角度夹角,此类夹角的相邻晶粒会在晶界处导致裂纹偏转或起到止裂效果。

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