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《Laser & Infrared》 2017-12
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Study on improvement mechanism of laser remelting on the Ni/WC coating microstructure

HE Wen;ZHAO Yun-cai;ZHANG Jia-ru;School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology;  
In order to further investigate the microstructure and properties of plasma sprayed ceramic coating by laser remelting,Ni/WC cermet coating was prepared on the surface of 45 steel by plasma spraying equipment,and then laser remelting was carried out. After that,the microstructure and properties of the coating were studied by SEM,XRD,Photoshop software and microhardness tester before and after laser remelting. The results show that plasma spray coating is a typical layered structure,and the bonding surface between the matrix and the coating is mechanically bonded.There are plenty of untreated WC particles in the coating,but the spray particles are decomposed at high temperature,meanwhile,the decomposed C element reacts with other elements to generate new compounds,which enriches the hard phase of the coating. However,the particles in the coating after laser remelting is uniform and can eliminate most of the pores and WC agglomeration in the coating. WC is decomposed again,resulting in a new hard phase,and form a "soft base phase + hard point" of the combined distribution with the surrounding Ni. In addition,the combination of coating translates the mechanical combination into metallurgical bonding. The porosity decreases from 7. 02% to 3.08%,and the microhardness increases accordingly,and the microhardness of the coating was higher than that of the substrate by 255 HV.
【Fund】: 国家自然科学基金项目(No.51565017);; 高端轴承摩擦学技术与应用国家地方联合工程实验室开放基金项目(No.201713);; 江西省自然科学基金(No.2012BAB206026);; 江西省教育厅资助项目(No.GJJ14424)资助
【CateGory Index】: TG178
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