对牙轮钻头牙爪轴颈失效部位进行宏观、微观形貌分析及金相组织分析,认为牙爪轴颈在使用过程中产生塑性变形和疲劳磨损,造成滚柱卡死,从而导致牙轮钻头失效。通过等离子合金化强化工艺,提高了牙爪轴颈的抗回火软化性能和接触疲劳强度,有效延长了牙轮钻头的使用寿命。 On the roller bit jaw jaw failure of macro-and micro-morphology analysis and microstructure analysis that the tooth claw shaft in the process of using plastic deformation and fatigue wear, resulting in roller stuck, resulting in roller cone bit Failure. Through the plasma alloying strengthening process, the anti-temper softening performance and the contact fatigue strength of the claw shaft are improved, and the service life of the roller cone bit is effectively prolonged.