Fe-18Mn-8Al-1C轻质钢的组织性能及变形机制

doi:10.13251/j.issn.0254-6051.2025.03.029

金属热处理 ›› 2025, Vol. 50 ›› Issue (3): 183-188.DOI: 10.13251/j.issn.0254-6051.2025.03.029

Fe-18Mn-8Al-1C轻质钢的组织性能及变形机制

马若曦, 尹宇彬, 邓超, 李子瑜, 张哲临, 丁桦

东北大学材料科学与工程学院, 辽宁沈阳 110819

收稿日期:2024-10-22 修回日期:2025-01-15 出版日期:2025-03-25 发布日期:2025-05-14
通讯作者: 丁桦,教授,博士生导师,E-mail:dingh@smm.neu.edu.cn
作者简介:马若曦(2003—),女,学士,主要研究方向为轻质钢的微观组织与性能,E-mail:neu25mrx@163.com。
基金资助:
大学生创新创业训练计划(231171)

Microstructure, mechanical properties and deformation mechanism of Fe-18Mn-8Al-1C lightweight steel

Ma Ruoxi, Yin Yubin, Deng Chao, Li Ziyu, Zhang Zhelin, Ding Hua

School of Materials Science and Engineering, Northeastern University, Shenyang Liaoning 110819, China

Received:2024-10-22 Revised:2025-01-15 Online:2025-03-25 Published:2025-05-14

摘要/Abstract

摘要： 对Fe-18Mn-8Al-1C轻质钢进行950 ℃退火1 h,并对退火后的试验钢进行不同变形量(ε=5%,15%,25%,35%)的拉伸试验。采用金相显微镜、电子背散射衍射、电子通道衬度像以及透射电镜等手段对其组织性能及变形机制进行了研究。结果表明,试验钢经950 ℃退火处理后获得了优异的综合力学性能。试验钢的变形过程呈现出典型的平面滑移特征,其塑性变形机制可归结为:位错单/多系滑移→泰勒晶格→显微带。几何必需位错密度的增加能够显著提升材料的应变硬化能力,而显微带的演化和发展能够诱发显微带诱导塑性(Microband induced plasticity,MBIP)效应,两者的共同作用使得试验钢在获得高强度的同时亦具有优异的伸长率。

关键词: Fe-Mn-Al-C轻质钢, 微观组织, 力学性能, 变形机制, 显微带诱导塑性, 泰勒晶格

Abstract: Fe-18Mn-8Al-1C lightweight steel was annealed at 950 ℃ for 1 h and tensile deformation with different tensile strain (ε=5%, 15%, 25%, 35%) was conducted. The microstructure, mechanical properties and deformation mechanism of the Fe-18Mn-8Al-1C lightweight steel were investigated by means of optical microscope, electron backscattered diffraction, electron channeling contrast imaging and transmission electron microscope. The results show that an excellent combination of high strength and adequate total elongation is obtained of the tested steel annealed at 950 ℃. A typical deformation mode, i.e., planer glide, is observed in the tested steel. The deformation mode can be concluded as: dislocation gliding in single/multiple slipping system →Taylor lattices →microband. The strain hardening ability can be significantly enhanced as a result of the increase in the geometrically necessary dislocation, while the effect of microband induced plasticity can be activated by the development of microband, leading to a simultaneous enhancement in the strength and elongation of the tested steel.

Key words: Fe-Mn-Al-C lightweight steel, microstructure, mechanical properties, deformation mechanism, microband induced plasticity, Taylor lattice

中图分类号:

TG156.21

马若曦, 尹宇彬, 邓超, 李子瑜, 张哲临, 丁桦. Fe-18Mn-8Al-1C轻质钢的组织性能及变形机制[J]. 金属热处理, 2025, 50(3): 183-188.

Ma Ruoxi, Yin Yubin, Deng Chao, Li Ziyu, Zhang Zhelin, Ding Hua. Microstructure, mechanical properties and deformation mechanism of Fe-18Mn-8Al-1C lightweight steel[J]. Heat Treatment of Metals, 2025, 50(3): 183-188.

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Fe-18Mn-8Al-1C轻质钢的组织性能及变形机制

Microstructure, mechanical properties and deformation mechanism of Fe-18Mn-8Al-1C lightweight steel

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