Hot deformation behavior of heat-resistant steel 2Cr12Ni4Mo3VNbN

doi:10.13251/j.issn.0254-6051.2023.11.004

Abstract

Abstract: Hot compression deformation behavior and microstructure evolution of heat-resistant steel 2Cr12Ni4Mo3VNbN were studied by Gleeble-3500 thermal simulation test machine under the conditions of deformation temperature of 900-1200 ℃, strain rate of 0.01-1 s^-1and deformation amount of 0.5. Based on the true stress-true strain curves, the effects of different deformation temperatures and strain rates on the hot deformation behavior of the tested steel were analyzed. The flow stress constitutive model of the tested steel was constructed by Arrhenius hyperbolic sine equation, and the hot processing map was drawn by combining with the dynamic material model (DMM). The results indicate that the peak flow stress decreases with the increase of temperature or the decrease of strain rate. As the strain rate is 0.1 s^-1, the dynamic recrystallization occurs when the deformation temperature reaches 1000 ℃, and the size of dynamic recrystallized grain increases with the increase of deformation temperature. Additionally, δ ferrite is found in the microstructure at different deformation temperatures, and its content increases with the increase of temperature. Combined with the hot processing map and microstructure evolution, the optimal hot working process of the heat-resistant steel 2Cr12Ni4Mo3VNbN is determined as 1068-1172 ℃, 0.08-0.12 s^-1.

Key words: 2Cr12Ni4Mo3VNbN heat-resistant steel, hot deformation behavior, microstructure

CLC Number:

TG142.73

Tang Hui, Tu Luhan, Li Ying, Wu Zhiwei, Zhou Zhiming, Zhang Jun. Hot deformation behavior of heat-resistant steel 2Cr12Ni4Mo3VNbN[J]. Heat Treatment of Metals, 2023, 48(11): 22-28.

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