Microstructure, Texture, and Mechanical Properties of Thin Titanium Plates Jointed by Coaxial Laser-Plasma Hybrid Welding

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-04-02 DOI:10.1007/s12540-024-01659-z

Detao Cai, Ziyi Luo, Weiqing Liu, Shanguo Han, Cong Chen, Khaskin Vladyslav, Yi Zhang

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Abstract

The coaxial laser-plasma hybrid welding provides a novel method for the composition of two heat sources and achieves gently transitional butt joints with wider upper surfaces. The influence of hybrid welding parameters on the weld appearance and composite plasma behaviors had been proved with a significant composite heat source effect previously; the effect of microstructure on its mechanical properties has been investigated and explored in this paper. Finite element computation based on temperature field simulation is conducted to shed more light on the heat distribution characteristics of this novel hybrid welding method. The temperature in the hybrid-dominated region is much higher than that in the laser-dominated region. The tensile strength of the hybrid welded joints is higher than the standard requirement of base metal, and fractured at the base metal with an obvious necking, indicating as ductile fracture. The nanohardness results show the hardness rank order of the weld zone, heat-affected zone and base metal. It is revealed that the grain refinement of acicular α' martensite and fine α_g particles, the increase of distribution of the geometric necessary dislocations and the large angle grain boundary proportion in the weld zone contribute to an increase in hardness, tensile strength of the hybrid welded joint of Ti–6Al–4V. It also discloses the reason why the tensile fracture location is on the base metal. This work provides a theoretical and practical basis for the application of thin titanium alloy welding, especially at high welding speed.

Graphical Abstract

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同轴激光-等离子混合焊接钛薄板的微观结构、纹理和力学性能

同轴激光-等离子混合焊接为两种热源的组合提供了一种新方法，并实现了上表面较宽的平缓过渡对接接头。混合焊接参数对焊缝外观和复合等离子体行为的影响已得到证实，复合热源效应显著；本文研究并探讨了微观结构对其力学性能的影响。基于温度场模拟的有限元计算进一步揭示了这种新型混合焊接方法的热分布特征。混合焊接区域的温度远高于激光焊接区域。混合焊接接头的抗拉强度高于母材的标准要求，并且在母材断裂时有明显的缩颈现象，表明是韧性断裂。纳米硬度结果显示了焊接区、热影响区和母材的硬度等级顺序。结果表明，针状α'马氏体和细αg颗粒的晶粒细化、几何必要位错分布的增加以及焊接区大角度晶界比例的增加有助于提高 Ti-6Al-4V 混合焊接接头的硬度和抗拉强度。它还揭示了拉伸断裂位置在母材上的原因。这项工作为薄钛合金焊接，尤其是高速焊接的应用提供了理论和实践依据。

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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.