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采用激光硬化与渗氮复合表面改性技术,对W9Mo3Cr4V高速钢表面进行了强化处理。利用X射线衍射仪、扫描电子显微镜、电子探针、显微硬度计和摩擦磨损试验机,分别对复合处理试样的相组成、微观组织、成分、显微硬度和耐磨性进行了分析。研究结果表明,复合处理表面改性层主要是回火马氏体、残余奥氏体、Fe3N、Cr7C3、M2C型碳化物所构成。由于激光硬化的晶粒细化作用,以及大量位错、孪晶、空位等微观缺陷的产生,致使氮化层的深度得到明显提高。与单一的激光硬化和渗氮工艺相比,复合处理工艺有效地提高了高速钢的硬度和耐磨性能。
Laser hardening and nitriding composite surface modification technology, W9Mo3Cr4V high-speed steel surface was strengthened. The phase composition, microstructure, composition, microhardness and wear resistance of the composite samples were analyzed by X-ray diffraction, scanning electron microscopy, electron probe, microhardness tester and friction and wear tester. The results show that the composite surface modification is mainly composed of tempered martensite, retained austenite, Fe3N, Cr7C3 and M2C carbides. Due to the grain refinement of laser hardening, as well as a large number of micro-defects such as dislocations, twins and vacancies, the depth of the nitride layer is significantly increased. Compared with a single laser hardening and nitriding process, composite treatment process effectively improve the high-speed steel hardness and wear resistance.