时效处理显著提高了Fe-24Mn-8Al-1C奥氏体轻钢的强度

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

Materials Characterization Pub Date : 2025-04-17 DOI:10.1016/j.matchar.2025.115045

Haokun Zhu , Qihan Gao , Yunpeng Tang , Yuming Zou , Hua Ding

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引用次数: 0

摘要

实现强度和延展性的良好结合是高强度钢的一个长期课题，这对新出现的奥氏体轻钢也很重要。在这里，我们报道了一种异质组织Fe-24Mn-8Al-1C奥氏体轻钢，具有异质晶粒尺寸。通过750°C短时间退火5 min，有意将这种异质组织引入轻量化钢中。经过短时间时效处理，异质组织样品的屈服强度得到了显著提高（约230 MPa），几乎是常规时效均匀样品（约50 MPa）的5倍。此外，时效处理后异质组织试样的加工硬化能力没有损失。最终，异质结构样品获得了良好的抗拉强度（1135 MPa）和伸长率（36%）的组合。这项工作的重点是利用κ碳化物来放大异质微结构不同区域之间的不相容。组织内不相容性的增强增强了异质变形诱导硬化（HDI），从而显著提高了材料的力学性能。

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Achieving a significant enhancement of strength in Fe-24Mn-8Al-1C austenitic lightweight steels by aging treatment

Achieving an excellent combination of strength and ductility is a long-term topic for high strength steels, which is also important for the newly emerged austenitic lightweight steels. Here, we report a hetero-structured Fe-24Mn-8Al-1C austenitic lightweight steel with heterogeneous grain size. This type of heterogeneous microstructure was intentionally introduced into the lightweight steel through a short time annealing at 750 °C for 5 min. After short time aging treatment, we achieved a dramatic improvement (about 230 MPa) of yield strength in the aged hetero-structured samples, which is almost 5 times higher than the conventional aged homogeneous samples (about 50 MPa). In addition, the work hardening ability of the hetero-structured samples exhibits no loss after aging treatment. Eventually, a good combination of tensile strength (1135 MPa) and elongation (36 %) was achieved in the investigated hetero-structured samples. The key point of this work is utilizing κ carbides to amplify the incompatibility between different zones of heterogeneous microstructures. The amplified incompatibility within the microstructures enhanced the hetero deformation induced (HDI) hardening which can dramatically strengthen the mechanical properties.

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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.