Fe–27.34Mn–8.63Al–1.03C轻质钢热变形行为研究

陆海涛; 李大赵; 李思远; 陈永安

doi:10.1007/s12613-022-2531-3

Volume 30 Issue 4

Apr. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(4): 734-743

Haitao Lu, Dazhao Li, Siyuan Li, and Yong’an Chen, Hot deformation behavior of Fe–27.34Mn–8.63Al–1.03C lightweight steel, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 734-743. https://doi.org/10.1007/s12613-022-2531-3

Cite this article as:

Haitao Lu, Dazhao Li, Siyuan Li, and Yong’an Chen, Hot deformation behavior of Fe–27.34Mn–8.63Al–1.03C lightweight steel, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp. 734-743. https://doi.org/10.1007/s12613-022-2531-3

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研究论文

Fe–27.34Mn–8.63Al–1.03C轻质钢热变形行为研究

中北大学材料科学与工程学院，太原 030051，中国

通讯作者:
李大赵 E-mail: lidazhao@nuc.edu.cn

文章亮点

(1) 阐明了峰值应力与临界应力之间的关系，建立了动态再结晶动力学模型。

(2) 基于微观组织，分析了热变形温度和应变速率对动态再结晶行为的影响。

(3) 根据热加工图，确定了Fe–27.34Mn–8.63Al−1.03C轻质钢的合理热加工工艺。

中文摘要

近年来，Fe–Mn–Al–C轻质钢以其优异力学性能和较低密度等优点而备受关注。然而，对于热轧态Fe–Mn–Al–C轻质钢的热变形行为特征还缺乏深入研究，特别是该钢种的动态再结晶行为对其热变形过程中的流动稳定性影响尚不明确。本文探究了Fe–27.34Mn–8.63Al–1.03C轻质钢的热变形行为，运用Gleeble-3800热模拟机，在900–1150°C温度范围及0.01–5 s⁻¹应变速率范围内进行了热压缩测试。结果表明，热变形过程中试验钢的流变应力随变形温度的降低和应变速率的增加而增加；本研究构建了试验钢本构方程，得出其热变形激活能为422.88 kJ·mol⁻¹；阐明了临界应力σ_c与峰值应力σ_p之间的关系，建立了动态再结晶动力学模型；根据动态再结晶动力学模型，理清了应变速率和变形温度对动态再结晶体积分数的影响，并结合微观组织分析了试验钢不同变形温度和应变速率下的动态再结晶行为；绘制了各变形量下的热加工图，明确了试验钢热变形时失稳区域；基于微观组织和热加工图结果，论述了热变形过程中试验钢发生流动失稳与动态再结晶程度相关性，最终总结出试验钢优化热加工工艺为0.01 s⁻¹低应变速率下于1010–1100°C温度范围内加工。

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Research Article

Hot deformation behavior of Fe–27.34Mn–8.63Al–1.03C lightweight steel

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Abstract

Abstract

Hot compression tests were performed to investigate the hot deformation behavior of Fe–27.34Mn–8.63Al–1.03C lightweight steel and optimize the hot workability parameters. The temperature range was 900–1150°C and the strain rate range was 0.01–5 s⁻¹ on a Gleeble-3800 thermal simulator machine. The results showed that the flow stress increased with decreasing deformation temperature and increasing strain rate. According to the constitutive equation, the activation energy of hot deformation was 422.88 kJ·mol⁻¹. The relationship between the critical stress and peak stress of the tested steel was established, and a dynamic recrystallization kinetic model was thus obtained. Based on this model, the effects of strain rate and deformation temperature on the volume fraction of dynamically recrystallized grains were explored. The microstructural examination and processing map results revealed that the tested steel exhibited a good hot workability at deformation temperatures of 1010–1100°C and strain rate of 0.01 s⁻¹.
- Fe–Mn–Al–C steel;
- hot deformation;
- activation energy;
- microstructural evolution;
- processing map

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