摘要
采用激光熔覆技术对3Cr2W8V模具钢进行了激光表面熔覆.所用的三种涂层材料分别为Ni基合金、Fe基合金和50%Fe基+50%WC.在与硬质合金对磨环的干滑动摩擦磨损过程中,测定了摩擦系数、磨损率随滑动距离的变化曲线,并与基材的进行对比;借助于扫描电镜观察熔覆层的微观组织形貌,分析了凝固组织的形成过程.试验结果表明,三种激光涂层都不同程度地改善了基材的耐磨性.其中50%Fe基+50%WC复合涂层在一定的滑动距离条件下的磨损率比基材的下降约90%,其次是Fe基合金涂层(下降约80%)、Ni基合金涂层(下降约60%).耐磨性的改善与涂层组织中形成的大量硬质相和高硬度的未熔化合物有关.
The surface on 3Cr2W8V mould steel is cladded by using a high power laser. Three kinds of coated materials, Ni-based alloy, Fe-based alloy and 50% Fe-based＋50% WC, are used respectively. In the dry sliding friction and wearing process of test sample to hard alloy, the variation of friction coefficient and wearing rate with sliding distance are measured and also compared with that of base material. The forming process of solidification structure is analyzed and the microstructure is observed by means of scanning electron microscope. The results show that these three kinds of coats can improve the wear resistance of mould steel in various degrees. In a certain sliding distance, the wearing rate of 50% Fe-based ＋ 50% WC composite coats lowers about 90% as compared to base material, next 80% Fe-based alloy and 60% Ni-based alloy. The improvement of wearing resistance has to do with forming more hard particles and carbides of incomplete melt in the clad layer.
出处
《温州大学学报（自然科学版）》
2007年第5期15-18,共4页
Journal of Wenzhou University(Natural Science Edition)
关键词
激光熔覆
模具钢
摩擦磨损
复合涂层
Laser cladding
Mould steel
Friction and wear
Composite coat
