固溶温度对Fe-Mn-Al-C奥氏体低密度钢组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.07.003

金属热处理 ›› 2025, Vol. 50 ›› Issue (7): 18-23.DOI: 10.13251/j.issn.0254-6051.2025.07.003

固溶温度对Fe-Mn-Al-C奥氏体低密度钢组织与性能的影响

张皓月¹, 唐正友^1,2, 崔峰¹, 张瀚文¹, 王镇轩¹

1.东北大学材料科学与工程学院, 辽宁沈阳 110819;
2.辽宁省轻量化用关键金属结构材料重点实验室, 辽宁沈阳 110819

收稿日期:2025-02-10 修回日期:2025-05-16 出版日期:2025-07-25 发布日期:2025-07-28
通讯作者: 唐正友,教授,博士生导师,E-mail:tangzy@smm.neu.edu.cn
作者简介:张皓月(1999—),女,硕士研究生,主要研究方向为Fe-Mn-Al-C低密度钢,E-mail:zhle03270219@163.com。
基金资助:
国家自然科学基金(51874088)

Effect of solution treatment temperature on microstructure and properties of Fe-Mn-Al-C austenitic low density steel

Zhang Haoyue¹, Tang Zhengyou^1,2, Cui Feng¹, Zhang Hanwen¹, Wang Zhenxuan¹

1. School of Materials Science and Engineering, Northeastern University, Shenyang Liaoning 110819, China;
2. Liaoning Provincial Key Laboratory of Lightweight Metallic Structural Materials, Shenyang Liaoning 110819, China

Received:2025-02-10 Revised:2025-05-16 Online:2025-07-25 Published:2025-07-28

摘要/Abstract

摘要： 采用光学显微镜(OM)、X射线衍射(XRD)和透射电镜(TEM)分析了固溶温度(900、950、1000和1050 ℃)对Fe-Mn-Al-C奥氏体低密度钢组织与力学性能的影响,以及经950 ℃固溶处理后的试验钢在不同应变量(5%、10%、25%和45%)下的微观组织特征。结果表明,试验钢经固溶处理后的组织为单一奥氏体。随着固溶温度由900 ℃升至1050 ℃,奥氏体平均有效晶粒尺寸从39 μm增大至135 μm,晶界逐渐平直化,且屈服强度和抗拉强度逐渐下降,断裂总延伸率上升。经950 ℃×30 min固溶处理后的抗拉强度为880 MPa,断裂总延伸率为64%,强塑积达到最大,为56.3 GPa·%。随着拉伸应变量的增加,与位错滑移相关的子结构不断发展,如平行位错段、泰勒晶格、泰勒晶格畴边界和微带。微带交叉实现了强度和延展性的出色结合。

关键词: Fe-Mn-Al-C奥氏体低密度钢, 固溶处理, 力学性能, 显微组织, 位错滑移

Abstract: Effect of solution treatment temperature (900, 950, 1000 and 1050 ℃) on microstructure and mechanical properties of a Fe-Mn-Al-C austenitic low density steel was analyzed by means of optical microscope (OM), X-ray diffractometer (XRD) and transmission electron microscope (TEM), and the microstructure characteristics of the tested steels under different strains (5%, 10%, 25% and 45%) were studied. The results indicate that the microstructure of the tested steel after solution treatment is single phase austenite. As the solution treatment temperature rises from 900 ℃ to 1050 ℃, the average effective grain size of the austenite increases from 39 μm to 135 μm and the grain boundary gradually becomes flat, meanwhile, the yield strength and tensile strength gradually decrease, and the total elongation increases. After solution treatment at 950 ℃ for 30 min, the tensile strength is 880 MPa, the total elongation is 64%, and the product of strength and elongation reaches the maximum value of 56.3 GPa·%. With the increase of tensile strain, the substructures relate to dislocation slip continue to develop, such as parallel dislocation segments, Taylor lattice, Taylor lattice domain boundaries, and microbands. The microband crossover provides an excellent combination of strength and ductility.

Key words: Fe-Mn-Al-C austenitic low density steel, solution treatment, mechanical properties, microstructure, dislocation slippage

中图分类号:

TG156.94

张皓月, 唐正友, 崔峰, 张瀚文, 王镇轩. 固溶温度对Fe-Mn-Al-C奥氏体低密度钢组织与性能的影响[J]. 金属热处理, 2025, 50(7): 18-23.

Zhang Haoyue, Tang Zhengyou, Cui Feng, Zhang Hanwen, Wang Zhenxuan. Effect of solution treatment temperature on microstructure and properties of Fe-Mn-Al-C austenitic low density steel[J]. Heat Treatment of Metals, 2025, 50(7): 18-23.

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固溶温度对Fe-Mn-Al-C奥氏体低密度钢组织与性能的影响

Effect of solution treatment temperature on microstructure and properties of Fe-Mn-Al-C austenitic low density steel

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