等离子表面钼铬共渗制备强化层的研究

利用辉光离子渗金属技术在Q235钢表面进行钼铬共渗，随后进行渗碳淬火、深冷处理及回火复合处理，对渗层组织、成分、硬度和摩擦磨损性能进行了分析。结果表明：渗层化学成分接近钼系高速钢；渗层中的碳化物细小、均匀、弥散，没有粗大的共晶莱氏体组织；经深冷2h处理试样表面硬度达到1600HV，明显高于未经深冷处理试样的表面硬度；经不同时间深冷处理试样的滑动摩擦因数基本相同，但比未经深冷处理的试样降低约15％，其相对耐磨性分另q是未渗金属试样的2．10倍和3．59倍。

Mo-Cr Strengthened Coating Prepared by Plasma Surface Infiltration

Mo-Cr strengthened coating was prepared on the surface of low carbon steel by the double glow plasma metallurgy, ultra-saturated carbonization, quenching, cryogenic treatment and low tempering. The microstructure, composition, microhardness and wear resistance were investigated. The alloyed layer composition was similar to that of molybdenum containing high speed steels. The carbides of the alloyed layer were compact, uniform and dispersed without coarse eutectic Ledeburite structure. The surface hardness after cryogenic treatment for 2 h was up to 1 600 HV, much higher than that without cryogenic treatment. The sliding friction coefficient of different cryogenic treated samples was basically identical. But it reduced about 15% compared with that without cryogenic treatment. Relative wear resistance was more than 1.10 and 2. 59 times in comparison with that of Q235 steel carburized and quenched.