Effect of Nb on carburizing depth and hardness of 20CrMo gear steel

doi:10.13251/j.issn.0254-6051.2021.10.005

Abstract

Abstract: According to comparative analysis of the depth and microhardness of the carburizing layer of 20CrMo steel containing Nb and without Nb carburized at different temperatures and carburizing time, the effect of Nb on carbon diffusion rate and final carburized layer quality was determined. The results show that the depth of carburized layer of 20CrMoNb steel with 0.032% Nb is close to that of 20CrMo steel at the same carburizing condition when the carburizing temperature is lower than 1000 ℃. And the maximum hardness difference of effective carburized layer is between 10 and 20 HV0.2, thus the addition of Nb has little effect on depth and hardness of the carburized layer. When the carburizing temperature is higher than 1000 ℃, the addition of Nb will reduce the depth and hordness of the effective carburized layer.

Key words: 20CrMo gear steel, and hardness Nb microalloyed steel, surface carburizing

CLC Number:

TG142.1

Zhang Wei, Shen Kang, Li Huichao, Wang Maoqiu. Effect of Nb on carburizing depth and hardness of 20CrMo gear steel[J]. Heat Treatment of Metals, 2021, 46(10): 31-33.

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