氩弧熔覆WC增强镍基涂层的组织与性能分析

Microstructure and properties of WC particulate reinforced Ni-based composite coatings formed by argon-arc cladding

利用氩弧为热源,以Ni60A和铸造WC混合合金粉末为原料,采用预置法在Q235普通碳素钢上制备了WC增强镍基涂层,用XJP 200型金相显微镜和KyKy2800型扫描显微镜观察了熔覆层的结合状况和组织结构,用MH 6型硬度计测量了熔覆层截面显微硬度,用MPX 200磨损试验机对比了熔覆层和65Mn淬火回火钢的耐磨性并分析了熔覆层的耐磨机理.结果表明,以氩弧为熔覆热源制备的熔覆层,组织致密均匀、强韧性高、耐磨性好且与基体呈冶金结合,熔覆层可以用于零件表面的耐磨强化.

In order to improve the wear-resistance properties of carbon steel,WC particulate reinforced Ni-based composite coatings was fabricated on Q235 steel substrate by using argon-arc cladding and using the mixed-powders of Ni60A and cast tungsten carbide powder as the raw materials.The bonding state and microstructure of the coatings were observed with metallography microscope model XJP-200 and scanning electronic microscope model KyKy-2800,the microhardness of the cross section of the coatings was tested with the hardmeter of model MH-6,the abradability of cladding coating to 65Mn steel quenched and tempered was used to compare wear tester model MPX-200,and the abrasion mechanism of the claddings was analyzed.The results indicate that microstructure of the claddings is uniform,continuous and defect-free;the strength,toughness and wear resistance of the claddings are excellent;bonding between the coating and the carbon steel substrate is ensured by the strong metallurgical interface.The claddings can be used to strengthen the surface of the wear-resistant parts.