Dynamic recrystallization behavior of 20Cr2Ni4A steel

doi:10.13251/j.issn.0254-6051.2024.10.030

Abstract

Abstract: Dynamic recrystallization behavior of 20Cr2Ni4A carburized steel for gears was studied by means of single isothermal compression test with deformation temperature of 800-1050 ℃ and strain rate of 0.01-5 s^-1 at the strain variable of 0.8 on Gleeble-3500 thermal simulation machine. According to the experimental results, the flow stress curve was drawn. The results show that the flow stress curve can be divided into dynamic recovery type and dynamic recrystallization type according to the degree of work hardening, dynamic recovery and dynamic recrystallization under different deformation conditions. At low strain rate (0.01-0.1 s^-1), the dynamic recrystallization occurs more obviously at 950-1050 ℃. The critical strain ε_c and peak strain ε_p of dynamic recrystallization are determined by the work hardening rate, and the relationship model between ε_c and ε_p is established. Based on the experimental data, a dynamic model of dynamic recrystallization is established, and the analysis of microstructure shows that the model is reliable.

Key words: 20Cr2Ni4A steel, thermal deformation, critical strain, dynamic recrystallization, volume fraction

CLC Number:

TG142.1

Wu Xiaodong, Zhou Shaorong, Zhang Xiaopeipei, Wang Zhongying. Dynamic recrystallization behavior of 20Cr2Ni4A steel[J]. Heat Treatment of Metals, 2024, 49(10): 179-184.

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