Dynamic recrystallization behavior of 34CrNi3MoV alloy steel

doi:10.13251/j.issn.0254-6051.2023.05.006

Abstract

Abstract: Single-pass isothermal compression test with maximum deformation of 50% was conducted by using Gleeble-1500 thermo-mechanical simulator, and the true stress-strain curves for 34CrNi3MoV steel were obtained at deformation temperature of 800-1200 ℃ and strain rate of 0.01-10 s^-1. The results show that, at 800 ℃ and 900 ℃ (1, 10 s^-1), the 34CrNi3MoV steel undergoes dynamic recovery only, while at 1000-1200 ℃ and 900 ℃(0.01, 0.1 s^-1) undergoes dynamic recrystallization. By using Arrhenius equation to calculate the activation energy Q under different strains, the corresponding relationship between activation energy Q and strain is obtained by using the quintic polynomial Q=331.78+1401.47ε-10 233.34ε²+33 725.26ε³-52 745.07ε⁴+31 981.48ε⁵. The relationships between critical eigenvalues (ε_c, ε_p) and Z parameter are constructed by using work-hardening rate, and based on which a kinetic model for the 34CrNi3MoV steel to predict dynamic recrystallization volume fraction is established: X_DRX=1-exp[-0.564((ε-ε_c)/ε_p)^1.945].

Key words: Cr-Ni-Mo steel, dynamic recrystallization, activation energy, critical eigenvalue, volume fraction

CLC Number:

TG142.7

Zou Zhipeng, Xu Dong, Ren Yicheng, Wang Yiqun, Zheng Lei, Pang Hongxuan. Dynamic recrystallization behavior of 34CrNi3MoV alloy steel[J]. Heat Treatment of Metals, 2023, 48(5): 32-40.

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