Effect of Nb microalloying on austenite grain growth of 18CrNiMo7-6 steel

doi:10.13251/j.issn.0254-6051.2021.09.009

Abstract

Abstract: Austenite grain growth behavior of the 18CrNiMo7-6 steels with Nb and without Nb heated at 900-1100 ℃ for 1-8 h was studied, and the mathematical models of the austenite grain growth of the two tested steels were established. The results show that with the increase of heating temperature and holding time, the austenite grain size of the tested steels increases gradually, and that of the 18CrNiMo7-6 steel with Nb is smaller than that without Nb under the same heating condition. By characterizing the grain growth process of the tested steels as inhibited growth stage (900-1000 ℃) and free growth stage (1000-1100 ℃), more suitable grain growth mathematical models are established respectively for the tested steels with Nb and without Nb.

Key words: Nb microalloying, 18CrNiMo7-6 steel, austenite grain growth, mathematical model

CLC Number:

TG142.33

Wang Zimin, Yang Zhiqiang, Hu Fangzhong, Wang Kaizhong, Ding Lei. Effect of Nb microalloying on austenite grain growth of 18CrNiMo7-6 steel[J]. Heat Treatment of Metals, 2021, 46(9): 53-57.

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