分析了GCr15钢经离子氮碳共渗加淬火处理后的含氟层的组织,马氏体形态和残余奥氏体量。研究结果表明:高碳钢中氮可促使马氏体晶细化,位错密度增高,组织以无中脊的孪晶片状和位错片状马氏体为主。文中指出:氮化物的分解是造成表面孔洞的根本原因,并提出:氮碳化合物层厚度可控制在5～10μm范围内。 The microstructure, martensite morphology and retained austenite content of GCr15 steel after ion nitrocarburizing and quenching were analyzed. The results show that the nitriding of high carbon steel can promote the martensite grain refinement and increase the dislocation density. The microstructure of the microstructure is mainly twins-like and dislocated sheet-like martensite. The article points out that the decomposition of nitrides is the fundamental cause of surface pores, and the thickness of nitrocarburized layer can be controlled in the range of 5 ~ 10μm.