Influence of residual stress and its relaxation on the corrosion bending fatigue resistance of EA4T axle steel treated by ultrasonic surface rolling

被引：25
作者：
Li, Hang [1 ]
Zhang, Jiwang [1 ]
Ao, Ni [1 ]
Xu, Junsheng [2 ]
Ji, Dongdong [1 ]
机构：
[1] Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Peoples R China
[2] Taiyuan Heavy Ind Transit Equipment Co Ltd, Taiyuan 030032, Peoples R China
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 170卷
基金：
中国国家自然科学基金;
关键词：
EA4T axle steel; Ultrasonic surface rolling process; Corrosion fatigue; Residual stress; Surface integrity; SPEED RAILWAY AXLES; CRACK GROWTH; MECHANICAL-PROPERTIES; TI-6AL-4V ALLOY; STRENGTH; DAMAGE; LIFE; MICROSTRUCTURE; PERFORMANCE; PREDICTION;
D O I：
10.1016/j.ijfatigue.2023.107561
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The fatigue properties and residual stress relaxation behavior of EA4T axle steel treated by ultrasonic surface rolling process (USRP) are investigated in air and corrosive environments. The result reveals that the surface roughness (Ra) is decreased from 1.42 to 0.17 mu m after the USRP. A surface layer with ultrafine grains, work hardening, and compressive residual stress (CRS) is achieved by the USRP. Compared with the as-machined specimens, the USRP specimens exhibit slightly lower electrochemical corrosion resistance but superior fa-tigue performance in air and corrosive environments. The dislocation density is significantly decreased in the corrosive environment during fatigue loads, accompanied by a rapid relaxation of surface CRS. The influence of USRP on the corrosion fatigue performance is elucidated. The residual stress relaxation mechanism and its in-fluence on fatigue resistance are also analyzed.
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页数：14
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