Evolution of austenite grain size of 42CrMo steel during heating

doi:10.13251/j.issn.0254-6051.2021.05.004

Abstract

Abstract: Austenite grain size of the 42CrMo steel heated at 890-930 ℃ for 10-240 min was measured through optical metallography exams. The results reveal that the 42CrMo steel is fully austenitized when heated between 890-930 ℃ and the grain growth is normal during the heating process. Temperature has an important effect on grain size, but the effect of holding time is minor. Grain growth is slow as holding time prolongs, and grain size and holding time satisfy a function whose exponent is less than 1. Experimental data are fitted to determine parameters of the Beck model, Sellars model and Anelli model. The prediction accuracy of all three models is better. Anelli model is considered being the most suitable, thus is recommended for the prediction of austenite grain growth law of the 42CrMo steel.

Key words: 42CrMo steel, grain growth, grain growth model, nonlinear regression

CLC Number:

TG142.1

Peng Ze, Li Mengnie, Bu Hengyong, Li Qi. Evolution of austenite grain size of 42CrMo steel during heating[J]. Heat Treatment of Metals, 2021, 46(5): 25-31.

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