氩弧熔覆Ni60A耐磨层在农机刀具上的应用

针对农机刀具对耐磨性要求高的特点，研究了氩弧熔覆自熔性合金熔覆层在农机刀具上的应用。试验以氩弧为热源，采用预置法在Q235钢基体上制备了Ni60A合金熔覆层，用金相显微镜、硬度计、磨损实验机等测试了熔覆层的结合状况、组织结构和性能。对熔覆层组织结构、形成原因以及熔覆层的耐磨机理进行了分析。金相分析表明熔覆层组织主要由树枝晶构成且熔覆层与基体间为冶金结合。磨损试验表明熔覆层耐磨性比常规淬火回火处理的65Mn钢有所提高。田间试验表明氩弧熔覆Ni60A自熔性合金熔覆层可用于农机刀具的制造和再制造。

Application of argon-arc clad Ni60A anti-abrasion coatings for cutter of agricultural machinery

In order to improve the abradability of carbon steel, the argon-arc clad Ni60A alloy experiments were conducted and its application for cutter of agricultural machinery was discussed. The Ni60A coatings were prepared on the surface of Q235 steel specimens by preplacing and argon-arc cladding. The interface between the coatings and substrate and microstructure were observed using metallographic microscope model XJP-200. The hardness of the coatings was tested by hardometer model HD9-45. The wear-resisting property of the coatings was tested on abrasion tester model MPX-200. The microstructure, forming mechanism and wear mechanism of the argon-arc clad coatings were analyzed. The metallurgical analysis indicates that the claddings is made up of a lot of dendrite, the bond between substrate and coating is metallurgy binding. The anti-abrasive test results show the clad coating is good at anti-abrasion and the abrasive performance is better than 65Mn steel treated by quenching and tempering. The field test results show that the technology is feasible to the manufacture and remanufacture of the cutter of agricultural machinery, and the optimization technological parameter for argon-arc clad Ni60A anti-abrasion coatings is: electric current of 150A, voltage 10V, direct current and positive connection, overlapping and cladding, insulating and slow cooling.