研究了Cr12MoV钢和W6Mo5Cr4V2钢气体渗氮和氮碳共渗的渗层结构随渗入时间的变化规律,提出了ε相层及氮、碳元素渗入深度与渗氮时间的数学关系式。探讨了渗层深度和渗层结构对耐磨性的影响。试验结果表明,Cr12MoV 钢在520℃经4～6h 气体渗氮后,表面硬度最高,磨损速率较常规淬火、回火处理的试件下降89.2%。W6Mo5Cr4V2钢在560℃×2h 气体氮碳共渗后,表面硬度最高,可获得最深(0.09mm)的高耐磨渗层。 The relationship between the infiltration time and the infiltration time of Cr12MoV steel and W6Mo5Cr4V2 steel was investigated. The mathematical relation between ε phase, nitrogen and carbon infiltration depth and nitriding time was proposed. The effects of the depth of the infiltration layer and the structure of the infiltration layer on the wear resistance were discussed. The results show that the surface hardness of Cr12MoV steel after nitriding at 520 ℃ for 4 ~ 6h is the highest, and the wear rate is 89.2% lower than that of conventional quenching and tempering specimens. W6Mo5Cr4V2 steel at 560 ℃ × 2h gas nitrocarburizing after the highest surface hardness, get the deepest (0.09mm) high wear-resistant layer.