Effect of Rapid Cooling on Microstructure and Mechanical Properties in Friction Stir Welded Twin-Induced Plasticity Steel

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-10-15 DOI:10.1007/s12540-024-01811-9

Yong-xin Ding, Yu-qian Wang, Sheng Guo, Guang-ming Xie

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引用次数: 0

Abstract

High Mn twin-induced plasticity (TWIP) steel are widely used because of their outstanding mechanical properties. In the welded joint of high Mn steel, Mn vapor and segregation reduce the quality of the joints. Friction stir welding (FSW) can obtain high-quality, defect-free joints but low yield strength. This work analyzes the microstructure evolution and deformation behavior of TWIP steel FSW joints in different micro-zones based on changing cooling conditions. Compared to the case under air-cooling, a strong shear stress was identified in the stirring zone (SZ) under water-cooling conditions because water-cooling has higher dislocation density and finer grains in the SZ and heat-affected zone (HAZ). Under water-cooling, the highest yield strength of the joint reached 519 MPa, respectively, since the non-uniformity of joint grain size can promote the accumulation of geometrically necessary dislocations (GNDs). In addition, rapid cooling shortens the thermal diffusion distance of HAZ and retains more twin boundaries, which enhances the twin dynamics and leads to twin-induced hardening. The present work provides further insights into the influence of the deformation mechanism of FSW joints of TWIP steel.

Graphical Abstract

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快速冷却对搅拌摩擦焊接双致塑性钢组织和力学性能的影响

高锰双致塑性钢因其优异的力学性能而得到了广泛的应用。在高锰钢焊接接头中，Mn蒸气和偏析降低了接头的质量。搅拌摩擦焊（FSW）可以获得高质量、无缺陷的接头，但屈服强度低。本文分析了不同冷却条件下TWIP钢FSW接头在不同微区组织演变及变形行为。与空冷相比，水冷条件下搅拌区（SZ）存在较强的剪切应力，因为水冷条件下搅拌区（SZ）和热影响区（HAZ）的位错密度更高，晶粒更细。在水冷时，接头的最高屈服强度分别达到519 MPa，这是由于接头晶粒尺寸的不均匀性促进了几何必要位错（GNDs）的积累。此外，快速冷却缩短了热影响区热扩散距离，保留了更多的孪晶边界，增强了孪晶动力学，导致孪晶诱导硬化。本研究对TWIP钢的FSW接头变形机制的影响提供了进一步的认识。图形抽象

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

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.