Effect of nitriding and diffusion time ratio on microstructure and properties of nitrided layer on AISI 316 stainless steel

doi:10.13251/j.issn.0254-6051.2022.05.030

Abstract

Abstract: AISI 316 stainless steel was nitrided by two-stage vacuum nitriding process under different strong nitriding and diffusion time. The microstructure and properties of the nitrided layers were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM), optical microscope (OM), microhardness test and friction and wear test. The results show that after vacuum nitriding for 12 h, the nitrided layer consisting of γ′-Fe₄N, ε-Fe_2-3N and CrN phases is formed on the surface of AISI 316 stainless steel. The surface hardness and wear resistance of the nitrided AISI 316 stainless steel are significantly improved compared with those of substrate. Among them, when the nitriding and diffusion time ratio is 1∶1 (strong nitriding for 6 h and diffusion for 6 h), the thickness of the nitrided layer is about 96 μm, the surface hardness is about 1069 HV0.5, which is 4.5 times of the surface hardness of the substrate, and the wear loss under the load of 20 N is about 1/3 of that of the substrate. When the nitriding and diffusion time ratio is 1∶2 (strong nitriding for 4 h and diffusion for 8 h), the nitrided layer thickness is about 120 μm, the diffraction peak of ε-Fe_2-3N phase is enhanced, and the wear loss under the load of 20 N is about 1/30 of that of the substrate. The prolonging of diffusion time can increase the thickness of nitrided layer, improve the surface morphology, and further improve the wear resistance of the AISI 316 stainless steel.

Key words: vacuum nitriding, AISI 316 stainless steel, nitriding and diffusion time ratio, microstructure, wear resistance

CLC Number:

TG156.8

Shen Tong, Yang Li, Li Zhen, Feng Lingxiao. Effect of nitriding and diffusion time ratio on microstructure and properties of nitrided layer on AISI 316 stainless steel[J]. Heat Treatment of Metals, 2022, 47(5): 183-188.

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