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Appl. Sci. 2017, 7(10), 1065; https://doi.org/10.3390/app7101065

Effect of Molybdenum on the Microstructures and Properties of Stainless Steel Coatings by Laser Cladding

1
State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Haidian District, Beijing 100084, China
2
School of Materials Science and Engineering, Beijing University of Technology, Number 100, Pingle Garden, Chaoyang District, Beijing 100124, China
3
Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
*
Authors to whom correspondence should be addressed.
Received: 11 September 2017 / Revised: 11 September 2017 / Accepted: 11 October 2017 / Published: 15 October 2017
(This article belongs to the Special Issue Solid State Lasers Materials, Technologies and Applications)
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Abstract

Stainless steel powders with different molybdenum (Mo) contents were deposited on the substrate surface of 45 steel using a 6 kW fiber laser. The microstructure, phase, microhardness, wear properties, and corrosion resistance of coatings with different Mo contents were studied by scanning electron microscopy (SEM), electron probe microanalyzer (EPMA), X-ray diffraction (XRD), microhardness tester, wear tester, and electrochemical techniques. The results show that good metallurgical bonding was achieved between the stainless steel coating and the substrate. The amount of M7(C, B)3 type borocarbide decreases and that of M2B and M23(C, B)6 type borocarbides increases with the increase of Mo content in the coatings. The amount of martensite decreases, while the amount of ferrite gradually increases with the increase of Mo content. When the Mo content is 4.0 wt. %, Mo2C phase appears in the coating. The microstructure of the coating containing Mo is finer than that of the Mo-free coating. The microhardness decreases and the wear resistance of the coating gradually improves with the increase of Mo content. The wear resistance of the 6.0 wt. % Mo coating is about 3.7 times that of the Mo-free coating. With the increase of Mo content, the corrosion resistance of the coating firstly increases and then decreases. When the Mo content is 2.0 wt. %, the coating has the best corrosion resistance. View Full-Text
Keywords: laser cladding; stainless steel powder; Mo content; microstructure; wear resistance; corrosion resistance laser cladding; stainless steel powder; Mo content; microstructure; wear resistance; corrosion resistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Wang, K.; Chang, B.; Chen, J.; Fu, H.; Lin, Y.; Lei, Y. Effect of Molybdenum on the Microstructures and Properties of Stainless Steel Coatings by Laser Cladding. Appl. Sci. 2017, 7, 1065.

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