应用复合离子注入法改善W9Cr4 V2 Mo轴承钢力学性能

Improvement of Mechanical Properties of W9Cr4V2Mo Bearing Steel Using Compound Ion Implantation

应用复合离子注入法改善了W 9Cr4V2Mo轴承钢的耐磨性能。试验结果表明 ,试样经复合离子注入N+Ti,N +Ta ,N +Nb ,N +Ta +C处理后 ,摩擦系数明显降低 ,显微硬度和耐磨性有所提高。微观分析表明 ,表层硬相化合物的形成及晶粒细化是材料表面耐磨性提高的主要原因 ,残余压应力的增加也表明抗疲劳性得到提高。

Technologies of compound ion implantation applied to improve the mechanical properties of W9Cr4V2Mo bearing steel are presented.The test results show that all compound ion implantations involved N+Ti,N+Ta,N+Nb,N+Ta+C are successful in improving the microhardness,wear resistance and reducing the friction coefficient of the sample surface.The microanalysis results reveal that some new hard phases are formed and some crystalline grains are refined in the surface layers.All these are the main factors to improve the wear resistance.The enhancement of the residual compression stresses also indicates that the fatigue resistance of the treated samples could be improved.