S34MnV钢的热变形行为及微观组织演变研究

刘璇; 李洪杰; 景红; 张震; 胡成亮

doi:10.3969/j.issn.1674-6457.2026.06.020

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精密成形工程 ›› 2026, Vol. 18 ›› Issue (6) : 218-227. DOI: 10.3969/j.issn.1674-6457.2026.06.020

钢铁成形

S34MnV钢的热变形行为及微观组织演变研究

刘璇¹, 李洪杰¹, 景红², 张震², 胡成亮^1,*

作者信息 +

Hot Deformation Behavior and Microstructure Evolution of S34MnV Steel

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

Author information +

文章历史 +

摘要

目的系统探究了S34MnV钢在热变形过程中的力学行为,重点探讨变形温度与应变速率对材料成形的影响,为该钢种的数值模拟与热加工工艺优化提供理论参考,同时为低合金钢热变形及组织演变研究积累基础数据。方法利用Gleeble-3800热模拟试验机进行等温热压缩实验,模拟实际热变形过程。实验参数为变形温度950~1 250 ℃（间隔50 ℃）和应变速率0.1、1、10 s^-1,压缩变形程度控制在0.75,以反映材料在加工中的变形情况。采用金相显微镜对变形后试样的微观组织进行观察。结果通过分析不同工艺条件下的流变应力曲线与峰值应力,构建了S34MnV钢的流变应力模型。研究提出了一种新的材料特征参数表达方式,并对现有应变补偿公式进行了优化,从而提高了对应力的预测能力。此外,明确了温度和应变速率对材料微观组织的影响规律。结论优化后的应变补偿模型能够准确预测应力变化。热变形参数对S34MnV钢的成形行为影响显著,在较低应变速率和较高变形温度条件下,材料更易发生动态再结晶,有利于降低流动应力并提升晶粒均匀性。

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.

导出引用

刘璇, 李洪杰, 景红, 张震, 胡成亮. S34MnV钢的热变形行为及微观组织演变研究[J]. 精密成形工程. 2026, 18(6): 218-227 https://doi.org/10.3969/j.issn.1674-6457.2026.06.020

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

中图分类号： TG142.71

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