In this paper,3J21 elastic alloy is used for 570℃ salt bath nitride to study the effect of QPQ treatment on its performance.The surface microvicker hardness,cross-section microvicker hardness,nitrous layer thickness,and phase structure composition are respectively analyzed after 3J21 treatment by microvickometer,optical microscope,and XRD dif-fraction analyzer.The results show that the surface hardness of alloy 3J21 is significantly improved after QPQ treatment,the result of the XRD diffraction spectrum shows that the low diffraction strength of each phase is mainly composed of α"phase,Ni3N,CrN and Co2N.
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