Dynamic recrystallization, textural evolution, and strengthening mechanism of medium-Mn steel subjected to friction-stir welding (FSW)

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

Materials Characterization Pub Date : 2025-06-22 DOI:10.1016/j.matchar.2025.115307

Hyo-Nam Choi , Hidetoshi Fujii , Seung-Joon Lee

引用次数: 0

Abstract

The present study aims to a comprehensive investigation of the relationship between dynamic recrystallization (DRX) behavior, textural evolution, and strengthening mechanisms in bcc α/α' and fcc γ phases during friction stir welding (FSW) of medium-Mn steel. The α/α' phases with high stacking-fault energy (SFE), predominantly revealed continuous DRX, forming island-type grains with high-angle boundaries within subdivided grains. In contrast, the γ phase with low SFE had discontinuous DRX, characterized by recrystallized regions featuring grain-boundary bulging assisted with limited twinning. Notably, DRX kinetics showed higher activity in α/α' phases compared to the γ phase, leading to two significant outcomes: a reduction in deformation texture (particularly, Trans-Goss component) and hardening in the stir zone center originated from the grain refinement and dislocation accumulation.

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中锰钢搅拌摩擦焊动态再结晶、织构演变及强化机理研究

本研究旨在全面研究中锰钢搅拌摩擦焊接（FSW）过程中bcc α/α′相和fcc γ相动态再结晶（DRX）行为、织构演变和强化机制之间的关系。具有高叠断能（SFE）的α/α′相以连续DRX为主，在细分的晶粒内形成具有高角度边界的岛状晶粒。相反，低SFE的γ相具有不连续的DRX，其特征是晶界胀形辅助的再结晶区和有限的孪生。值得注意的是，与γ相相比，DRX动力学在α/α′相中表现出更高的活性，导致两个显著的结果：变形织构（特别是Trans-Goss成分）的减少和搅拌区中心由晶粒细化和位错积累引起的硬化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.