Fe-30Mn-9Al-0.85C轻钢搅拌摩擦处理和后时效处理的组织与拉伸性能

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-04-12 DOI:10.1016/j.matchar.2025.115023

Hongyan Lv , Chunyu Wang , Jinghua Zhang , Hongshi Li , Xiaojun He , Huan Li , Ruidong Fu , Yijun Li

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引用次数: 0

摘要

本研究系统研究了经过摩擦搅拌加工（FSP）和时效后处理的 Fe-30Mn-9Al-0.85C 轻质钢的微观结构和机械性能。在加工速度为 40 mm/min 时，转速分别为 400 rpm、500 rpm 和 600 rpm 时，加工区（PZ）无宏观缺陷。PZ 中出现了晶粒细化，并且在 FSP 之后，基体金属中的初始 κ 碳化物溶解了。在 500 ℃ 和 600 ℃ 下进行的后时效处理促进了 κ 碳化物的析出，但并未引起 PZ 中的晶粒长大。PZs 的老化微观结构呈现出不完全再结晶状态，存在大量残余变形位错。晶界和位错强化对屈服强度的贡献有限，而κ-碳化物的沉淀强化在老化处理前后控制 PZs 拉伸性能方面发挥了重要作用。采用 500 rpm 和 40 mm/min 的加工参数，然后在 600 °C 下进行 1 小时的后时效处理，可获得最佳拉伸性能。

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Microstructures and tensile properties of Fe-30Mn-9Al-0.85C lightweight steel by friction stir processing and post-aging treatment

In this study, the microstructures and mechanical properties of Fe-30Mn-9Al-0.85C lightweight steel after friction stir processing (FSP) and post-aging treatment were systemically investigated. The processing zones (PZs) exhibited no macroscopic defects at rotational speeds of 400 rpm, 500 rpm, and 600 rpm with a processing speed of 40 mm/min. Grain refinement occurred in the PZs, and the initial κ-carbides in the base metal dissolved after FSP. Post-aging treatment at 500 °C and 600 °C promoted the precipitation of κ-carbides without inducing grain growth in the PZs. The aged microstructure of the PZs exhibited an incompletely recrystallized state with numerous residue deformation dislocations. Grain boundary and dislocation strengthening had a limited contribution to yield strength, while the precipitation strengthening of κ-carbides played a significant role in controlling the tensile properties of the PZs before and after aging treatment. The optimal tensile properties were achieved using a processing parameter of 500 rpm and 40 mm/min, followed by post-aging treatment at 600 °C for 1 h.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.