针对W18Cr4V钢制滚刀使用过程中在滚刀棱角处出现厚度约为0.05～0.07 mm的脆性剥落现象,对滚刀热处理工艺、显微组织和硬度进行了分析。结果表明,滚刀的脆性剥落是离子氮化温度过高,保温时间过长,表面清理不干净等原因造成。通过调整离子氮化工艺,将原来的离子氮化温度由600℃降低到570℃,适当缩短保温时间等措施,防止了脆性剥落现象的再次发生。 Aiming at the brittle spalling phenomenon with the thickness of about 0.05 ~ 0.07 mm at hob edge during the use of W18Cr4V steel hob, the heat treatment process, microstructure and hardness of hob were analyzed. The results show that the brittle flaking of the hob is caused by the high temperature of ion nitriding, too long holding time and unclean surface cleaning. By adjusting the ion nitriding process, the original ion nitriding temperature is lowered from 600 ° C to 570 ° C, the holding time is appropriately shortened, and the occurrence of brittle spalling is prevented.