Hot Deformation Behavior and Recrystallization Structure of Fe-1.3C-5Cr-0.4Mo-0.4V Ultra High Carbon Steel

doi:10.3901/JME.2020.12.116

Abstract

Abstract: The Gleeble-3500 thermal simulator is used to simulate the thermal compression of Fe-1.3C-5Cr-0.4Mo-0.4V ultra-high carbon steel under a temperature of 950-1 150, a strain rate of 0.01℃ -5 s^-1, and a deformation of 40%. To study the influence of deformation temperature and strain rate of Fe-1.3C-5Cr-0.4Mo-0.4V ultra-high carbon steel on the true stress-strain curve of ultra-high carbon steel during hot compression and the evolution of recrystallization structure, and construct stress constitutive equation of ultrahigh carbon steel. The results show that ultrahigh carbon steel is more prone to recrystallization when the deformation temperature is increased and the strain rate is lowered. When the strain rate is constant, the flow stress decreases with the increase of temperature, when the temperature is constant, the flow stress decreases with the decrease of strain rate. The constitutive equation is obtained by the flow stress curve, which can accurately describe the rheological behavior of ultra-high carbon steel, and the activation energy of ultrahigh carbon steel is Q=729.37 kJ/mol. In terms of microstructure, when the deformation temperature is 1 050, the grain size decreases by 5.21℃ μm when the strain rate from 0.01 s^-1 to 5 s^-1. Therefore, ultra-high carbon steel should be thermally deformed at a temperature of 1 000 to 1 050 and a strain rate of 1℃℃ to 5 s^-1.

Key words: Fe-1.3C-5Cr-0.4Mo-0.4V ultra-high carbon steel, hot compression deformation, flow stress, flow stress constitutive equation, microstructure evolution

CLC Number:

TG142

ZHANG Wei, YAN Zhijie, WANG Rui, LI Dazhao, KANG Yan, WU Zhonghao, YANG Xiaomin. Hot Deformation Behavior and Recrystallization Structure of Fe-1.3C-5Cr-0.4Mo-0.4V Ultra High Carbon Steel[J]. Journal of Mechanical Engineering, 2020, 56(12): 116-123.

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