Dynamic recrystallization behavior and processing map of 17Cr2Ni2MoVNb and 20Cr2Ni4A gear steels

doi:10.13251/j.issn.0254-6051.2021.12.013

Abstract

Abstract: The flow stress curves of 17Cr2Ni2MoVNb and 20Cr2Ni4A gear steels at 1000-1150 ℃ and 0.01-10 s^-1 were obtained by means of thermal simulation Gleeble-3800, and the dynamic recrystallization Avrami dynamics model and the processing map of the two steels were constructed. The results show that both steels are susceptible to dynamic recrystallization at high deformation temperatures and low strain rates. The higher Nb and Mo content in 17Cr2Ni2MoVNb steel has a greater inhibitory effect on dynamic recrystallisation than the high Ni content in 20Cr2Ni4A steel, which results in a smaller dynamic recrystallisation volume fraction in 17Cr2Ni2MoVNb steel than in 20Cr2Ni4A steel under the same heat deformation conditions. The optimal hot processing parameters of 17Cr2Ni2MoVNb steel are in the processing temperature range of 1050-1150 ℃ and at the strain rate of 0.1-0.6 s^-1, while those of 20Cr2Ni4A steel are in the processing temperature range of 1100-1150 ℃ and at the strain rate of 3.3-5.5 s^-1.

Key words: gear steel, dynamic recrystallization, Avrami dynamic curve, processing map

CLC Number:

TG142

Dong Mingzhen, Ouyang Xuemei, Liu Yangming, Gou Lei, Yuan Wufeng, Yan Yongming. Dynamic recrystallization behavior and processing map of 17Cr2Ni2MoVNb and 20Cr2Ni4A gear steels[J]. Heat Treatment of Metals, 2021, 46(12): 81-86.

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