Behavior of hot deformation and critical strain for dynamic recrystallization of a Q690 low carbon microalloyed steel

被引：0

作者：

机构：

[1] [1,Tan, Zhi-Lin

[2] 1,Xiang, Song

来源：

Xiang, S. (xiangs221@163.com) | 1600年 / Editorial Office of Transactions of Materials, 18 Xueqing Road, Beijing, 100083, China卷 / 34期

关键词：

Critical strains - Digital control - Hot deformation activation energies - Hot deformation behaviors - Low carbon microalloyed steels - Simulation tests - Steady-state stress - Strain hardening rate;

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摘要：

The hot deformation behavior of Q690 low carbon microalloyed steel was studied by compression testing on a Gleeble-3800 digital control heat/force simulation test machine at 850-1150°C and true strain rate range from 0.01 s-1 to 30 s-1. The hot deformation activation energy of 356.05 kJ/mol is determined and constitutive equation for hot deformation of the steel is obtained by characterizing the flow stress using both the peak stress and steady-state stress. Based on the relationship between strain hardening rate and true stress, the critical strain is determined, and a equation characterizing the relationship between the critical strain and Zener-Hollomon factor is derived.

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