多层氩弧熔敷含TiC颗粒增强涂层的微观组织及耐磨性能

Microstructure and wear-resisting property of TiC particle reinforced coatings claded by TIG welding with multiple layer

利用多层多道钨极氩弧熔覆技术，熔融预涂于钢基体表面钛铁和石墨混合粉末，可以在普通碳钢表面获得综合性能优异的复合材料表面熔敷层；测试和分析表明。熔敷层微观组织主要由铁素体、低碳马氏体、原位生成的TiC颗粒及碳化物等组成；熔敷层表面硬度达到了HRC57以上，呈梯度分布特征；滑动磨损试验表明，由于TiC增强颗粒的存在，熔敷层与摩擦副的摩擦系数在磨损过程中不稳定，变化范围较大；TiC颗粒对摩擦的阻碍、钉扎作用大大提高了熔敷层的抗磨损性能，熔敷层磨损体积比基体金属小15—20倍，具有良好的耐磨性能。

By using TIG welding,ferrite based composite coating reinforced with TiC has been synthesized by preplaced alloy powder which contains Ti and C on the surface of conventional carbon steel.Results show that in situ TiC particles were prepared in the coating.The microstructure of the coating was mainly composed of ferrite,retained austenite,TiC particles and carbide.The surface hardness of the coating is higher than 55 HRC and presents gradient distribution nearer to the surface of the coating.The wear-resisting test indicated that the friction coefficient of the coating is varied acutely.Blocking effect of TiC particles leads to excellent wearing resistance.The coating has a excellent wearresisting property.The result of wear-resisting test shows that the wear-resisting volume of the coating is less than that of the base metal by 15-20 times.