Microstructure Evolution and Recrystallized Behavior of Friction Stir Welding Twin-Induced Plasticity Steel

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2024-08-13 DOI:10.1007/s40195-024-01750-9

Ke Qiao, Kuaishe Wang, Jia Wang, Zhengyang Hao, Kairui Xue, Jun Cai, Fengming Qiang, Wen Wang

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Abstract

The restoration mechanism of twin-induced plasticity (TWIP) steel during friction stir welding (FSW) changed with the degree of the deformation, and the microstructure evolution and dynamic recrystallization are complex and unclear. In this paper, the electron backscattered diffraction and transmission electron microscopy techniques were used to evaluate the dynamic grain structure of FSW joint of TWIP steel. The results showed that the dynamic recrystallization mechanisms in TWIP steel during FSW contained discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX). The recrystallization mechanism transitioned from DDRX at the initial deformation stage to DDRX and CDRX at the middle deformation stage, eventually becoming primarily CDRX at the end deformation stage. Numerous annealing twin boundaries (ATBs) were formed within the joint, and the straight ATBs primarily resulted from grain growth accidents, while cluster-shaped ATBs were formed through re-excitations and decomposition of specific grain boundaries.

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摩擦搅拌焊接双诱导塑性钢的显微组织演变和再结晶行为

孪晶诱导塑性（TWIP）钢在搅拌摩擦焊（FSW）过程中的修复机理随变形程度的变化而变化，其微观结构演变和动态再结晶复杂而不清晰。本文采用电子背散射衍射和透射电子显微镜技术评估了 TWIP 钢 FSW 接头的动态晶粒结构。结果表明，TWIP 钢在 FSW 过程中的动态再结晶机制包括不连续动态再结晶（DDRX）和连续动态再结晶（CDRX）。再结晶机制从初始变形阶段的 DDRX 过渡到中期变形阶段的 DDRX 和 CDRX，最终在末期变形阶段主要变为 CDRX。接头内形成了许多退火孪晶边界（ATB），直形 ATB 主要由晶粒生长事故造成，而团簇形 ATB 则是通过特定晶界的再激发和分解形成的。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.