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Metals 2017, 7(12), 551;

Effect of Cobalt on Microstructure and Wear Resistance of Ni-Based Alloy Coating Fabricated by Laser Cladding

State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China
Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China
Authors to whom correspondence should be addressed.
Received: 5 November 2017 / Revised: 29 November 2017 / Accepted: 4 December 2017 / Published: 7 December 2017
(This article belongs to the Special Issue Laser Welding of Industrial Metal Alloys)
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Ni-based alloy powders with different contents of cobalt (Co) have been deposited on a 42CrMo steel substrate surface using a fiber laser. The effects of Co content on the microstructure, composition, hardness, and wear properties of the claddings were studied by scanning electron microscopy (SEM), an electron probe microanalyzer (EPMA), X-ray diffraction (XRD), a hardness tester, and a wear tester. The results show that the phases in the cladding layers are mainly γ, M7(C, B)3, M23(C, B)6, and M2B. With the increase in Co content, the amounts of M7(C, B)3, M23(C, B)6, and M2B gradually decrease, and the width of the eutectic structure in the cladding layer also gradually decreases. The microhardness decreases but the wear resistance of the cladding layer gradually improves with the increase of Co content. The wear resistance of the NiCo30 cladding layer is 3.6 times that of the NiCo00 cladding layer. With the increase of Co content, the wear mechanism of the cladding layer is changed from abrasive wear to adhesive wear. View Full-Text
Keywords: laser cladding; Ni-based alloy; Co content; microstructure; wear resistance laser cladding; Ni-based alloy; Co content; microstructure; wear resistance

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Wang, K.; Chang, B.; Lei, Y.; Fu, H.; Lin, Y. Effect of Cobalt on Microstructure and Wear Resistance of Ni-Based Alloy Coating Fabricated by Laser Cladding. Metals 2017, 7, 551.

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