Effect of nonuniform microstructure on wear property of ER8 wheel steel

被引：16

作者：

Zhang, Guan-Zhen ^{[1
,2
]}

Liu, Chun-Peng ^{[2
]}

Ren, Rui-Ming ^{[2
,3
]}

Wu, Si ^{[1
]}

Yin, Hong-Xiang ^{[1
]}

Cong, Tao ^{[1
]}

Li, Xiang ^{[1
]}

机构：

[1] China Acad Railway Sci Corp Ltd, Met & Chem Res Inst, Beijing 100081, Peoples R China

[2] Dalian Jiaotong Univ, Sch Mat Sci & Engn, Dalian 116028, Peoples R China

[3] Dalian Jiaotong Univ, Key Lab Crit Mat Rail Transportat Liaoning Prov, Dalian 116028, Peoples R China

来源：

WEAR | 2020年 / 458卷

关键词：

High-speed wheel steel; Nonuniform microstructure; Upper bainite; Fatigue wear; ROLLING-CONTACT FATIGUE; SLIDING CONTACT; PEARLITE; EVOLUTION;

D O I：

10.1016/j.wear.2020.203416

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Because nonuniform microstructures may accelerate the wear rate of wheels made from ER8 steel, a wear test was performed on a wheel sample with a nonuniform microstructure, and the wear properties were compared with that of a wheel composed of a uniform microstructure. In addition, the wear mechanism of the wheel with a nonuniform microstructure was analyzed. In addition to the uniform microstructure of pearlite and proeutectoid ferrite, upper bainite was observed in the wheel with a nonuniform microstructure. The upper bainite disrupted the continuity and uniformity of the microstructure. Moreover, owing to the different work hardening mechanisms of upper bainite and pearlite, the plastic deformations of upper bainite and pearlite were incompatible, which induced and promoted the formation of fatigue cracks in the nonuniform microstructure and further accelerated fatigue wear.

引用

页数：7

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