Hot deformation behavior and hot processing map of DH780 steel

doi:10.13251/j.issn.0254-6051.2020.06.025

Abstract

Abstract: Hot deformation behavior of the experimental steel was investigated with a compression test on Thermecmastor-Z simulator at 800-1150 ℃ and strain rate range between 0.01-10 s^-1. The hot deformed microstructure was also observed. Based on the experimental data analysis, the hot deformation equation of the steel in austenite region and the processing map under 0.8 strain were established. The results show that the flow stress and the peak strain decrease with the increase of the deformation temperature. The activation energy in the austenite region is 385.91 kJ/mol. The optimal processing parameters determined by the power dissipation coefficient and the rheological instability are 1050-1150 ℃ and 0.01-0.1 s^-1. In this range, the full dynamic recrystallization occurs in the experimental steel, and the power dissipation coefficient is 17%-32%.

Key words: DH steel, hot deformation, hot processing map, rheological instability

CLC Number:

TG142.1

Wang Junfeng, He Yutian. Hot deformation behavior and hot processing map of DH780 steel[J]. Heat Treatment of Metals, 2020, 45(6): 114-118.

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