Effect of nitriding temperature on post-oxidating infiltrated layer of 42CrMo steel part surface

doi:10.13251/j.issn.0254-6051.2021.02.033

Abstract

Abstract: Effect of nitriding temperature on properties of the infiltrated layer of 42CrMo steel parts treated by the process of nitriding with post-oxidating was studied by means of hardness test, microstructure observation, and evaluation of brittleness grade and porosity grade. The results show that the thickness and porosity grade of the infiltrated layer increase with the increase of nitriding temperature, but the brittleness grade changes little. The surface hardness of the infiltrated layer increases first and then decreases with the increase of nitriding temperature. When the nitriding temperature is 560 ℃, the 42CrMo steel parts can obtain infiltrated layer with excellent properties, of which the surface hardness and the thickness of infiltrated layer is ≥600 HV and ≥15 μm respectively, the brittleness and the porosity of infiltrated layer is grade 1 and grade 2, respectively.

Key words: 42CrMo steel, nitriding with post-oxidating, surface hardness, infiltrated layer thickness, brittleness grade, porosity grade

CLC Number:

TG156.8⁺2

Meng Xuan, Yue Jiahong, Kong Lingfei, Yang Yang, Jia Peng. Effect of nitriding temperature on post-oxidating infiltrated layer of 42CrMo steel part surface[J]. Heat Treatment of Metals, 2021, 46(2): 182-184.

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