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Fe-15Mn-15Al-5Ni-1C低密度钢热压缩的微观结构与本构方程

Microstructure and Constitutive Equation of Hot Compressive Fe-15Mn-15Al-5Ni-1C Low-Density Steel.

作者信息

Wang Yingjie, Hu Fengya, Wang Zhongjun, Fu Kuijun, Li Weijuan, Wang Jiaji, Guo Jing

机构信息

School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China.

State Key Laboratory of Metal Material for Marine Equipment and Application, Ansteel Group Corporation, Anshan 114009, China.

出版信息

Materials (Basel). 2022 Apr 7;15(8):2721. doi: 10.3390/ma15082721.

DOI:10.3390/ma15082721
PMID:35454416
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9025885/
Abstract

The hot deformation behavior and dynamic recrystallization (DRX) of Fe-15Mn-15Al-5Ni-1C low-density steel in the as-cast state was investigated via hot compression experiments over temperature and strain rate ranges of 925 to 1150 °C and 0.01 to 10 s, respectively. A constitutive equation and a critical DRX model of the Fe-15Mn-15Al-5Ni-1C low-density steel were also constructed. The results showed that higher strain rates resulted in significant work hardening and subsequent rapid softening of the Fe-15Mn-15Al-5Ni-1C low-density steel, while lower strain rates resulted in predominantly steady-state flow behavior. The activation energy of deformation for the Fe-15Mn-15Al-5Ni-1C low-density steel was Q = 540 kJ mol and the stress index was n = 4. The hot deformation mechanism was solute dragging and dislocation climbing, which was controlled by the strain rate. Increasing the deformation temperature or strain rate reduced the critical stress value σ of the DRX of the Fe-15Mn-15Al-5Ni-1C low-density steel and contributed to the DRX of austenite and δ-ferrite. The Fe-15Mn-15Al-5Ni-1C low-density steel after the hot compression deformation was mainly composed of austenite, ferrite, and κ carbide phases.

摘要

通过在925至1150°C温度范围和0.01至10 s -1应变率范围内进行热压缩实验，研究了铸态Fe-15Mn-15Al-5Ni-1C低密度钢的热变形行为和动态再结晶（DRX）。还构建了Fe-15Mn-15Al-5Ni-1C低密度钢的本构方程和临界DRX模型。结果表明，较高的应变率导致Fe-15Mn-15Al-5Ni-1C低密度钢显著加工硬化并随后快速软化，而较低的应变率导致主要为稳态流动行为。Fe-15Mn-15Al-5Ni-1C低密度钢的变形激活能为Q = 540 kJ/mol，应力指数为n = 4。热变形机制为溶质拖拽和位错攀移，受应变率控制。提高变形温度或应变率会降低Fe-15Mn-15Al-5Ni-1C低密度钢DRX的临界应力值σ，并促进奥氏体和δ-铁素体的DRX。热压缩变形后的Fe-15Mn-15Al-5Ni-1C低密度钢主要由奥氏体、铁素体和κ碳化物相组成。

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