High temperature carburizing process of Nb microalloyed 17CrNiMo6 steel gear shaft

doi:10.13251/j.issn.0254-6051.2024.11.041

Abstract

Abstract: Effect of Nb microalloying on the austenite grain size of the 17CrNiMo6 steel under different Nb addition was studied, and high temperature carburizing was carried out on the tested steel at different temperatures (910, 930, 940 ℃) by measuring the effective hardening layer depth and mechanical properties. The results show that the effect of Nb microalloying on the austenite grain refinement of the 17CrNiMo6 steel is significant, and the Nb content increases, the austenite grain grade increases, and the appropriate Nb addition range is 0.03%-0.04%. Compared with high temperature carburizing at 910 ℃, the effective hardening layer depth of the 17CrNiMo6 steel with 0.032%Nb is increased after high temperature carburizing at 930 ℃ and 940 ℃, and the carburizing rate is increased by 8.3%-11.9% and 13.3%-15.3%, respectively. However, there is no significant difference in mechanical properties and grain size. The carburizing rate of the microalloyed 17CrNiMo6 steel can be accelerated by appropriately increasing the carburizing temperature.

Key words: 17CrNiMo6 gear steel, Nb microalloying, high temperature carburizing, grain size, effective hardening layer depth

CLC Number:

TG156.8

Han Chunyang, Hu Hanting, Zhang Pei, Zhao Xueqian , Wang Mingfei. High temperature carburizing process of Nb microalloyed 17CrNiMo6 steel gear shaft[J]. Heat Treatment of Metals, 2024, 49(11): 267-271.

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