Abstract
To reveal the influence of hydrogen on the characteristics of defect-free titanium alloy welded joints, the effects of hydrogen addition on the precipitation behavior in the hydrogenated 0.12 wt.%H weld zone of Ti-0.3Mo-0.8Ni alloy argon-arc-welded joints have been investigated. The results showed that lamellar δ-hydride (face-centered cubic) could only precipitate from α-lamellae, but not from the transformed β-phase due to the high hydrogen solubility in β-phase. Formation of δ-hydride was the result of the αH-phase separation reaction: αH → α (H-lean region) + δ (H-rich region). The formation mechanism of the relatively massive δ-hydride in the αH-matrix was mainly based on the combined effects of harsh stress field states and stringent hydrogen content requirements. A sharp drop in elongation and a slight increase in weld zone hardness of the hydrogenated welded joint were associated with δ-hydride precipitation.
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Acknowledgements
The authors would like to gratefully acknowledge support of this work by the National Nature Science Foundation of China under Grant No. 51671152, Northwest Institute for Non-ferrous Metal Research. The authors would also like to acknowledge Y.Q. Wang, a researcher at China Aeronautical Manufacturing Technology Research Institute, for high-temperature hydrogen charging.
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Liu, Q.M., Zhang, Z.H., Yang, H.Y. et al. Hydride Precipitation in the Hydrogenated 0.12 wt.%H Weld Zone of Ti-0.3Mo-0.8Ni Alloy Argon-Arc-Welded Joints. JOM 70, 1902–1907 (2018). https://doi.org/10.1007/s11837-018-2978-x
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DOI: https://doi.org/10.1007/s11837-018-2978-x