Effects of αs and α′ phase contents on the impact toughness of Ti-3Al-2Mo-2Zr alloy welded by electron beam

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2025-07-01 Epub Date: 2025-04-15 DOI:10.1016/j.msea.2025.148353

Yuzhao Lv , Ting Wang , Pengfei Zhao , Guijun Mao

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Abstract

Due to the non-equilibrium nature of the weld metal (WM) solidification process, it is challenging to achieve superior impact toughness in titanium alloy joints. Electron beam welding (EBW) was used to join 30-mm-thick Ti-3Al-2Mo-2Zr titanium alloy plates. The factors contributing to the impact toughness of WM were elucidated. The WM consisted of columnar grains and a few equiaxed grains. Fine acicular colony α′ phase and acicular secondary α (α_s) phase were present in the grains. The top region retained 64 % of the base metal's impact toughness, while the bottom region retained only 36 % of the base metal's impact toughness. Moreover, reducing the welding speed improved the impact toughness of WM. The colony α′ in WM enhanced impact toughness due to its good ability to hinder crack propagation. The α_s phase reduced impact toughness due to its poor resistance to crack propagation. This study provides a reference for optimizing the toughness of titanium alloy EBW joints.

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αs和α′相含量对电子束焊接Ti-3Al-2Mo-2Zr合金冲击韧性的影响

由于焊缝金属凝固过程的非平衡性，使钛合金接头具有优异的冲击韧性是一项挑战。采用电子束焊接（EBW）连接30mm厚Ti-3Al-2Mo-2Zr钛合金板。分析了影响WM冲击韧性的因素。WM由柱状晶粒和少量等轴晶粒组成。晶粒中存在细针状集落α′相和针状次生α (αs)相。顶部区域保留了64%的母材冲击韧性，而底部区域仅保留了36%的母材冲击韧性。降低焊接速度可提高WM的冲击韧性。WM中的菌落α′由于具有良好的抑制裂纹扩展的能力而提高了冲击韧性。αs相由于抗裂纹扩展能力差而降低了冲击韧性。该研究为优化钛合金EBW接头的韧性提供了参考。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.