等离子熔覆CoCrFeMnNi高熵合金涂层参数优化及组织与性能研究

doi:10.11896/cldb.20040198

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Abstract The parameters of plasma arc welding (PAW) were optimized by orthogonal tests, the CoCrFeMnNi high entropy alloy coating was prepared by PAW on Q235 steel substrate. The microstructure and properties of cladding layer were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), electron back scatter diffraction (EBSD) and microhardness tes-ter.The results showed that the significance influence of plasma process parameters on the dilution ratio of cladding layer is in turn with welding speed, the arc current and feeding gas flow, but which on the microhardness of cladding layer is in turn with the arc current, welding speed and feeding gas flow. The optimal parameter combination obtained by the range, variance and macromorphology of cladding layer is welding current of 70 A, welding speed of 7 mm/s, feeding gas of 8 L/s. Under these conditions, the cladding layer has no obvious macroscopic crack, but it has many pores, micro holes and few aggregations. The cladding layer is mainly composed of FCC structure phase as the type phase of Ni, the main elements are uniformly distributed on the cladding layer surface. The diameter of 92.7% grains within cladding layer surface is less than 10 microns. The oriention distribution of the low-angle grain boundarys (LAGBS) is concentrated within 5°, but that of the high-large angle grain boun-darys (HAGBS) is randomly distributed at 15—55°. The dilution ratio of the coating layer is about 17.86%. The hardness distribution on cladding layer surface is relatively uniform, however, that of the cross-section is changed with the gradient for microstucture.

Key words： plasma arc welding CoCrFeMnNi entropy alloy coating parameter optimization microstructure property

Published: 02 September 2020

CLC number:

TG455

Fund:National Natural Science Foundation of China(51861025),the Key Research Program of Jiangxi Province, China(20171BBE50043)

About author:: Shiyong Wei is the associate researcher in Institute of Applied Physics, Jiangxi Sciences Academy,and received his B.S. degree in metal material engineering from Nanchang Aviation University in 2003. He is currently pursuing his Ph.D. at School of the Materials Science and Engineering, Nanchang University under the supervision of Prof. Wenyi Peng. His research interests are metal material and its surface modification, including coating of cemented carbide, high entropy alloys, self-lubricating, etc. In recent years, he has published more than 20 papers in the field of metal material and its surface modification.
Wenyi Peng, Professor, Vice Chairwoman of Department of Materials Science and Engineering, School of Materials Science and Engineering, Nanchang University. She gained Talent Project in the New Millennium of Jiangxi Province granted by Jiangxi Provincial Government in 2009, Technical Innovation Award in Jiangxi Province, “Surface strengthening technology of Tantalum spinnerets ” in 2002 and Progress Prize in Science and Technology in Jiangxi Province, “Application of multi-arc plasma plating to tool and die steels” in 1996 respectively. She obtained her Ph.D.at Shanghai Jiaotong University in 2006.
Xiaohua Deng, Professor, Doctoral Supervisor, Vice president of Nanchang University, Distinguished Professor for the Cheung Kong Scholars Program of the Ministry of Education(2002). He gained the National Science Fund for Distinguished Yong Scholars in 2003. He presided over the major projects from the NSFC, the major projects of scientific and technological Cooperation. His research interests include physics of plasma and its applications, Terahetz material and so on. His papers have been published in the prestigious international journals, such as Nature, Science, Physics of Plasma, Journal of Plasma Physics, etc.

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	WEI Shiyong
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Cite this article:

WEI Shiyong,PENG Wenyi,ZHAO Wenchao, et al. Research on Parameter Optimization and Microstructure and Properties of CoCrFeMnNi High Entropy Alloy Coating Cladded by Plasma Arc Welding[J]. Materials Reports, 2020, 34(17): 17052-17057.

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http://www.mater-rep.com/EN/10.11896/cldb.20040198 OR http://www.mater-rep.com/EN/Y2020/V34/I17/17052

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