Metastable pitting behaviour of austenite stainless steel under compressive residual stress
Metastable pitting behaviour of austenite stainless steel under compressive residual stress
复制标题
残余压应力下奥氏体不锈钢的亚稳态点蚀行为
DOI：
10.1002/maco.201911304
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发表时间：
2019-11-19
影响因子：
1.8
通讯作者：
Wang, Guan
中科院分区：
文献类型：
--
作者：
Guan, Lei;Cai, Jianmin;Wang, Guan
研究了奥氏体不锈钢在酸性NaCl溶液中压缩变形后的亚稳态点蚀行为。结果表明，压缩变形后，点蚀的萌生速率增加，亚稳态点蚀寿命和点蚀扩展速率均降低。同时，在残余压应力作用下，表面Cr/Fe氧化物比例增加，而稳定凹坑的平均尺寸变小，呈浅盘状。结果表明，在Cr氧化物富集和残余压应力的作用下，钝化膜破坏后的残余物被破坏，从而加速了点蚀再钝化。
Metastable pitting behaviour of austenite stainless steel after compressive deformation in an acidic NaCl solution was investigated. The results show that the pit initiation rate increases while both metastable pit lifetime and growth rate decrease after compressive deformation. Meanwhile, the ratio of the surface oxide fraction of Cr to Fe increases whereas the average size of stable pits is smaller and shallow disk-shaped under compressive residual stress. The results reveal that with the aid of enrichment of Cr oxides and compressive residual stress, which helps break the remnants of the undermined passive film, pit repassivation can be accelerated.