Hot Deformation Behavior and Microstructure Evolution of S34MnV Steel

LIU Xuan; LI Hongjie; JING Hong; ZHANG Zhen; HU Chengliang

doi:10.3969/j.issn.1674-6457.2026.06.020

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (6) : 218-227. DOI: 10.3969/j.issn.1674-6457.2026.06.020

Iron and Steel Forming

Hot Deformation Behavior and Microstructure Evolution of S34MnV Steel

LIU Xuan¹, LI Hongjie¹, JING Hong², ZHANG Zhen², HU Chengliang^1,*

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Abstract

The work aims to systematically investigate the mechanical behavior of S34MnV steel during hot deformation with focuses on effects of deformation temperature and strain rate on its forming process, so as to provide theoretical support for numerical simulation and optimization of hot working processes for this steel grade, while also contributing fundamental data to the study of hot deformation and microstructural evolution in low-alloy steels. Through isothermal hot compression tests conducted on a Gleeble-3800 thermal simulation tester, the hot deformation process was simulated under temperature ranging from 950 to 1 250 ℃ (at 50 ℃ intervals) and strain rates of 0.1, 1, and 10 s^-1, with true strain set to 0.75 to accurately reflect actual hot deformation conditions. Microstructural observation was carried out with an optical microscope. Based on the analysis of flow stress curves and peak stresses under different conditions, a flow stress model for S34MnV steel was established. A new method for characterizing material parameters was proposed, and the strain compensation formula was optimized, leading to improved stress prediction accuracy. Furthermore, the influence of temperature and strain rate on microstructure was systematically examined. The results demonstrate that the optimized strain-compensated model accurately predicts stress behavior. Hot deformation parameters significantly influence the forming behavior of S34MnV steel, with lower strain rates and higher temperature promoting dynamic recrystallization, which reduces flow stress and improves grain uniformity.

Key words

S34MnV steel / hot deformation behavior / isothermal hot compression tests / constitutive equation / microstructure

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LIU Xuan, LI Hongjie, JING Hong, ZHANG Zhen, HU Chengliang. Hot Deformation Behavior and Microstructure Evolution of S34MnV Steel[J]. Journal of Netshape Forming Engineering. 2026, 18(6): 218-227 https://doi.org/10.3969/j.issn.1674-6457.2026.06.020

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Funding

National High-Quality Development Special Project (TC230A07H); Inner Mongolia-SJTU Science and Technology Cooperation Special Project (China) (2023XYJG0001-01-05)