Why do cracks occur in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment?

Ling Shao; Ling Shao; Ling Shao; Xinyu Zhang; Yingwei Chen; Liu Zhu; Liu Zhu; Sujun Wu; Qijie Liu; Weiwei Li; Weiwei Li; Na Xue; Na Xue; Zhibiao Tu; Zhibiao Tu; Tianle Wang; Jitang Zhang; Jitang Zhang; Sheng Dai; Sheng Dai; Xinxing Shi; Mengliang Chen

doi:10.3389/fmats.2023.1135407

Frontiers in Materials (Mar 2023)

Why do cracks occur in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment?

Ling Shao,
Ling Shao,
Ling Shao,
Xinyu Zhang,
Yingwei Chen,
Liu Zhu,
Liu Zhu,
Sujun Wu,
Qijie Liu,
Weiwei Li,
Weiwei Li,
Na Xue,
Na Xue,
Zhibiao Tu,
Zhibiao Tu,
Tianle Wang,
Jitang Zhang,
Jitang Zhang,
Sheng Dai,
Sheng Dai,
Xinxing Shi,
Mengliang Chen

Affiliations

Ling Shao: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Ling Shao: Taizhou Key Laboratory of Medical Devices and Advanced Materials, Research Institute of Zhejiang University-Taizhou, Taizhou, China
Ling Shao: Taizhou Clean Carbon Technology Company Limited, Taizhou, China
Xinyu Zhang: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Yingwei Chen: Taizhou Key Laboratory of Medical Devices and Advanced Materials, Research Institute of Zhejiang University-Taizhou, Taizhou, China
Liu Zhu: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Liu Zhu: Taizhou Clean Carbon Technology Company Limited, Taizhou, China
Sujun Wu: School of Materials Science and Engineering, Beihang University, Beijing, China
Qijie Liu: Taizhou Key Laboratory of Medical Devices and Advanced Materials, Research Institute of Zhejiang University-Taizhou, Taizhou, China
Weiwei Li: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Weiwei Li: Taizhou Clean Carbon Technology Company Limited, Taizhou, China
Na Xue: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Na Xue: Taizhou Clean Carbon Technology Company Limited, Taizhou, China
Zhibiao Tu: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Zhibiao Tu: Taizhou Clean Carbon Technology Company Limited, Taizhou, China
Tianle Wang: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Jitang Zhang: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Jitang Zhang: Taizhou Clean Carbon Technology Company Limited, Taizhou, China
Sheng Dai: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Sheng Dai: Taizhou Clean Carbon Technology Company Limited, Taizhou, China
Xinxing Shi: Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou, China
Mengliang Chen: School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou, China

DOI: https://doi.org/10.3389/fmats.2023.1135407
Journal volume & issue: Vol. 10

Abstract

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Ultrasonic pulse frequency tungsten inert gas welding technology was adopted to join Ti-22Al-25Nb alloy. There were some cracks in the Ti-22Al-25Nb alloy weld joint after post-weld heat treatment. The hardness and Young’s modulus of α2, O, and β/B2 phases in Ti-22Al-25Nb alloy were examined with an in situ nanoindentation technique. The phase transition stresses of three different phases in the weld joint of Ti-22Al-25Nb alloy were analyzed to explain why cracks occur in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment. The results show that mean hardness is highest for the α2 phase, second-highest for the O phase, and lowest for the β/B2 phase; the mean Young’s modulus has the same trend in Ti-22Al-25Nb alloy. Phase transition stress results in cracks in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment. By improving post-weld heat treatment, the ultimate strength of the Ti-22Al-25Nb alloy weld joints reaches 750 MPa, which is 72.5% that of the base material.

Published in Frontiers in Materials

ISSN: 2296-8016 (Online)
Publisher: Frontiers Media S.A.
Country of publisher: Switzerland
LCC subjects: Technology
Website: https://www.frontiersin.org/journals/materials

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