脉冲爆炸-等离子体处理M42高速钢的表面改性

Surface modification of M42 high speed steel by pulse detonation-plasma treatment

为了提高M42高速钢的表面硬度和耐磨性,利用脉冲爆-炸等离子体(PDP)对该钢进行表面改性。通过SEM、XRD、显微硬度计、摩擦磨损试验机研究了脉冲处理前后表面形貌、元素成分、表面硬度和耐磨损性的变化。结果表明,表层马氏体(α-Fe)向奥氏体(γ-Te)转变,少量碳化物FeW_3C溶解于γ-Fe中,表层出现残余压应力且晶粒细化,沉积在表面的"雨滴"状熔滴由W和O等元素组成。经两次脉冲处理后硬化层最厚耐磨性较好。

In order to improve the surface hardness and wear resistance of M42 high speed steel,the surface modification treatment was performed with pulse detonation-plasma（PDP）.The surface morphology,element composition,surface hardness and wear resistance were analyzed by using SEM,XRD,micro hardness tester,friction and wear testing machine.The results show that the martensite（α-Fe） in the surface layer changed into austenite（γ-Fe）.The carbides of FeW3C in the surface layer dissolved into the γ-Fe.The surface residual compress stress was formed and the grain were refined.The plasma molten drops deposited on the surface of the steel were composed of elements such as W and O and so on.The excellent wear resistance can be achieved for the thickest hardened depth with twice pulse detonation-plasma treatment.