Wear resistance enhancement of QT700-2 ductile iron crankshaft processed by laser hardening

被引：11

作者：

Chen Z. ^{[1
]}

Yu X. ^{[1
]}

Ding N. ^{[1
]}

Cong J. ^{[2
]}

Sun J. ^{[3
]}

Jia Q. ^{[1
]}

Wang C. ^{[1
]}

机构：

[1] School of Mechanical and Electrical Engineering, Soochow University, Suzhou

[2] School of Mechanical Engineering, Shandong University of Technology, Zibo

[3] Tianrun Industry Technology Co., Ltd., Weihai

来源：

Optics and Laser Technology | 2023年 / 164卷

基金：

中国国家自然科学基金;

关键词：

Crankshaft; Ductile cast iron; Hardness; Laser hardening; Wear behavior;

D O I：

10.1016/j.optlastec.2023.109519

中图分类号：

学科分类号：

摘要：

As an important component of automotive engines, the crankshaft usually requires surface treatment to improve its service reliability and lifetime. This work provided a detailed laser parameter study to enhance the wear performance of the QT700-2 ductile cast iron crankshaft sample (thickness of 10 mm), using a fiber laser (maximum power of 2000 W) hardening system. FEA temperature field simulation was performed to initially estimate an appropriate parameter range, and then verified by single factor experiments to evaluate the individual laser parameter effect. The microstructural observation unveiled an evolution from pearlite in the base material to fine needle-shaped martensite with graphite nodules and retained austenite in the laser hardened layer, where phase transformation was found to be more dependent on laser scanning speed. With the optimized laser parameter set, the hardened layer hardness increased from 250 HV to more than 800 HV, reducing the corresponding wear depth from 17.57 μm to 11.45 μm and coefficient of friction from 0.8 to 0.6. The significantly enhanced wear performance was mainly resulted from wear mechanisms transition from sever ploughing wear in the base material to mild adhesive wear in the laser hardened region. © 2023 Elsevier Ltd

引用

共 26 条

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