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Influence of carbon pre-coating prior to laser deposition on rolling contact fatigue of gray cast iron

Published online by Cambridge University Press:  23 October 2015

Zhikai Chen ,
Ti Zhou ,
Ruoyu Zhao ,
Haifeng Zhang ,
Wanshi Yang ,
Hong Zhou ,
Peng Zhang  and
Luquan Ren
Zhikai Chen
Affiliation:
The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China
Ti Zhou
Affiliation:
The Department of Mechanical and Automotive Engineering, Jilin University, Changchun, Jilin Province 130025, People's Republic of China
Ruoyu Zhao
Affiliation:
The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China
Haifeng Zhang
Affiliation:
The Department of Mechanical and Automotive Engineering, Changchun University, Changchun, Jilin Province 130028, People's Republic of China
Wanshi Yang
Affiliation:
The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China
Hong Zhou
Affiliation:
The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China
Peng Zhang*
Affiliation:
The Key Lab of Automobile Materials, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China
Luquan Ren
Affiliation:
The Key Lab of Terrain Machinery Bionics Engineering, The Ministry of Education, Jilin University, Changchun, Jilin Province 130025, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

This work presented a study on the improvement of laser surface treatment on rolling contact fatigue resistance of gray cast iron. Sample surface covered with carbon powder was coupled with localized treatment by high-energy laser beam—a process defined as “laser cladding (LC).” With this method, the optimum precoating thickness was experimentally studied. Compared to the region treated by laser remelting, the crystal in LC region was finer, more compact, and uniform. Mechanical property testing showed not only high micro-hardness of LC region, but also improved tensile and compressive resistance of treated material. Fatigue wear tests and thorough analysis of fatigue detects suggested that LC treatment significantly improved fatigue wear resistance (FWR). Improved FWR was likely facilitated by delayed initiation and propagation of cracks, as well as the reduction of contact stress on substrate. Additionally, formations of fatigue defects on sample surface were thoroughly discussed.

Keywords

laser claddingthickness of coatingfatigue wear resistancefatigue damages
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 20 , 28 October 2015 , pp. 3104 - 3115
Copyright
Copyright © Materials Research Society 2015 

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