【摘要】 利用脉冲爆炸-等离子体(Pulse Detonation-Plasma Technology,PDT)技术对M2高速钢进行了表面改性处理,利用SEM、XRD分析PDT处理前后M2高速钢的表层组织和相结构的影响,采用显微硬度计、摩擦磨损试验机研究了PDT处理前后M2高速钢的显微硬度、耐磨性能的变化。结果表明:在PDT处理后,M2高速钢表面改性层内发生了马氏体向奥氏体的相转变,在表面层的残余奥氏体量随着距离的减小增加。在PDT处理过程中, M2高速钢的表面先发生光滑化,然后出现大量火山状熔坑,这是由于PDT处理过程中能量周期性导致表面热不稳定性造成的。改性层厚度随着距离的减小而逐渐增加,改性层组织细小致密,碳化物颗粒细小且分布均匀;改性层内显微硬度明显提高,耐磨性能提高2.48倍。更多还原

【Abstract】 Surface modification of M2 high speed steel was treated by pulse detonation-plasma technology(PDT), the effects of PDT on the morphology and phase structure of M2 high speed steel were analyzed. The microhardness and wear resistance of M2 high speed steel before and after PDT treatment were investigated by microhardness tester, fiction and wear testing machine. The experimental results show that phase transformation of martensite to austenite appears in the surface of M2 high speed steel after PDT treatment, and the amount of residual austenite in the surface layer increased with the decreased of distance during the PDT treatment. The surface is smoothed first, and then a large number of volcanic craters appeare due to the surface thermal instability caused by the energy periodicity during the PDT treatment. The thickness of the modified layer increases with the decreasing distance. the structure of modified layer is fine and dense, and the carbide particles are fine and evenly distributed, the microhardness in modified layer is improved obviously and the wear resistance is improved 2.48 times.更多还原