Through orthogonal test and grey correlation degree analysis,the primary and secondary relationship and rule of influence of nitrided layer of 1Cr11Ni2W2MoV martensitic stainless steel on wear performance were studied.The microstructure of nitrided layer was observed by optical microscope,and the thickness of nitrided layer was measured by metallography.The surface phase of the nitrided layer was analyzed by means of XRD diffractometer.The surface hardness and hardness gradient of the nitrided layer were measured by Vickers hardness tester.The friction and wear properties of nitrided layer were measured by SRV friction and wear testing machine,the maximum wear depth and wear volume were measured by white light interference 3D surface profilometer,and the wear mechanism was analyzed by scanning electron microscope.The influence of surface hardness,hardness gradient and thickness of nitrided layer on wear properties was studied by grey correlation analysis.The results show that the wear failure of stainless steel nitrided layer is mainly caused by abrasive wear,adhesive wear and local fatigue spalling.The surface hardness,hardness gradient and thickness of nitrided layer have significant effects on the wear performance under the condition of constant large load 200 N,and the thickness of nitrided layer has the most significant effect on the wear performance,and the wear performance decreases with the increase of the thickness of nitrided layer.
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