Research on Parameter Optimization and Microstructure and Properties of CoCrFeMnNi High Entropy Alloy Coating Cladded by Plasma Arc Welding
WEI Shiyong1,2, PENG Wenyi1, ZHAO Wenchao1, KANG Yifan1, CHEN Bin1, BAO Rongrong1, DENG Xiaohua3
1 School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China 2 Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang 330090, China 3 Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China
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.
作者简介: 魏仕勇,江西省科学院应用物理研究所副研究员。2003年6月本科毕业于南昌航空大学,获得工学学士学位,现为南昌大学材料科学与工程学院博士研究生,在彭文屹教授的指导下进行研究。目前主要从事金属材料及其表面改性的研究工作。近年来,在金属材料及其表面改性领域发表论文20余篇。 彭文屹,南昌大学材料科学与工程学院教授、博士研究生导师,江西省百千万人才(2009年)。教育部学位与研究生教育发展中心学位评审专家、国家自然基金委通讯评委、科技部国家中小企业创新基金评委等。第十三届国际材联亚洲材料大会(IUMRS-ICA2012)分会主席,中国机械工程学会会员。获江西省技术发明二等奖一项,科技进步三等奖一项。2006年于上海交通大学取得工学博士学位。 邓晓华,理学博士,教授,博士研究生导师, 教育部“长江学者奖励计划”特聘教授,国家杰出青年基金获得者,南昌大学副校长。国家自然科学基金委员会专家评审组成员。主持国家自然科学基金委重大项目,教育部科学技术研究重大项目,中奥国际合作项目,论文曾在国际著名期刊Nature,Science, Physics of Plasma,Journal of Plasma Physics等发表。
引用本文:
魏仕勇, 彭文屹, 赵文超, 康依凡, 陈斌, 鲍蓉蓉, 邓晓华. 等离子熔覆CoCrFeMnNi高熵合金涂层参数优化及组织与性能研究[J]. 材料导报, 2020, 34(17): 17052-17057.
WEI Shiyong, PENG Wenyi, ZHAO Wenchao, KANG Yifan, CHEN Bin, BAO Rongrong, DENG Xiaohua. Research on Parameter Optimization and Microstructure and Properties of CoCrFeMnNi High Entropy Alloy Coating Cladded by Plasma Arc Welding. Materials Reports, 2020, 34(17): 17052-17057.
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2020, Vol. 34 
