Corrosion fatigue crack growth behavior of a structurally gradient steel for high-speed railway axles

Ni Ao,Han Zhang, Huihui Xu,Shengchuan Wu, Dong Liu,Pingguang Xu,Yuhua Su,Qianhua Kan,Guozheng Kang

Engineering Fracture Mechanics（2023）

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摘要

•Effect of corrosive medium on FCG behaviors in a structurally gradient steel with different pre-crack depths is clarified.•Relationship between pre-crack depth and FCG/CFCG rates is revealed.•Compared with corrosion, fatigue loading plays a major role in CFCG rate at a frequency of 5 Hz.•X-ray μCT results verified a retardation effect of anodic dissolution on CFCG rate.

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关键词

Corrosion fatigue crack propagation,Gradient microstructure,Surface defect,Corrosion behavior

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