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Microstructure and Mechanical Properties of Hydrogenated Ti-0.3Mo-0.8Ni Alloy Gas Tungsten Arc Welding Joints

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Abstract

Microstructure, tensile property, microhardness and fracture behavior of the hydrogenated Ti-0.3Mo-0.8Ni alloy gas tungsten arc welding (GTAW) joints were investigated. The results show that the microstructure of the hydrogenated 0.21 wt.% H weld zone were composed of alternating lamellar alpha/needle-like transformed beta and the hydride. Transformed beta was secondary decomposed into the short rod-shaped secondary alpha and lamellar residual beta. The “Pinning” effect of the hydride and more difficult dislocations cross slip directly led to the increased ultimate tensile and yield strength. Average hardness of weld zone, heat affected zone and base metal for the hydrogenated specimens were 196, 177 and 169 HV respectively. Hardness of the former was greater than that of the latter two, hydrogen-induced hardness of the welded joint was significantly increased. Fracture mode of the hydrogenated welded joints changed from the single ductile fracture to mainly brittle fracture with a few dimples fracture. Main cracks that propagated alternately to the original beta grain boundary resulted in local fracture of the microstructure, the interconnected local fractures finally led to the overall fracture of the hydrogenated welded joint.

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Acknowledgments

The authors would like to gratefully acknowledge that of this work was supported by China Postdoctoral Science Foundation (Grant No. 2020M672306) and Innovation Scientists and Technicians Troop Projects of Henan Province (Grant No. ZYQR20180030). At the same time, the authors also would like to thank the researcher at China Aeronautical Manufacturing Technology Research Institute, Y. Q. Wang for thermohydrogen processing, the researcher at Xi’an University of Architecture and Technology, M. Yang for fruitful discussion.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou, People’s Republic of China

    Quanming Liu, Weimin Long & Sujuan Zhong

  2. Shaanxi Key Laboratory of Friction Welding Technologies and State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, People’s Republic of China

    Quanming Liu & Li Fu

  3. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, People’s Republic of China

    Zhaohui Zhang

  4. Institute of Titanium Alloy Research, Northwest Institute for Nonferrous Metal Research, Xi’an, People’s Republic of China

    Haiying Yang

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  1. Quanming Liu
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Liu, Q., Long, W., Fu, L. et al. Microstructure and Mechanical Properties of Hydrogenated Ti-0.3Mo-0.8Ni Alloy Gas Tungsten Arc Welding Joints. J. of Materi Eng and Perform 30, 1022–1029 (2021). https://doi.org/10.1007/s11665-020-05417-1

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