Metastable pitting behaviour of austenite stainless steel under compressive residual stress,Materials and Corrosion

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Metastable pitting behaviour of austenite stainless steel under compressive residual stress
Materials and Corrosion ( IF 1.6 ) Pub Date : 2019-11-19 , DOI: 10.1002/maco.201911304
Lei Guan ₁ , Jianmin Cai ₁ , Xiangyu Yang ₁ , Yu Li ₁ , Guan Wang ₁

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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.

中文翻译：

残余压缩应力下奥氏体不锈钢的亚稳态点蚀行为

研究了在酸性NaCl溶液中压缩变形后奥氏体不锈钢的亚稳态点蚀行为。结果表明，压缩变形后，基坑起初速率增加，而亚稳态基坑寿命和生长速率均下降。同时，在残余压应力作用下，Cr与Fe的表面氧化物分数之比增加，而稳定凹坑的平均尺寸较小且呈浅盘状。结果表明，借助于铬氧化物的富集和压缩残余应力，这有助于破坏被破坏的钝化膜的残留物，可以加速凹坑的钝化。

更新日期：2019-11-19

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