Quick Search:       Advanced Search
张朝晖,刘全明,刘世锋,杨海瑛.置氢0.12%H对Ti-0.3Mo-0.8Ni氩弧焊接接头组织演变影响[J].稀有金属材料与工程(英文),2019,48(1):104~110.[Zhang Zhaohui,Liu Quanming,Liu Shifeng and Yang Haiying.Effect of 0.12wt.% hydrogen addition on microstructural evolution of Ti-0.3Mo-0.8Ni alloy argon-arc welded joints[J].Rare Metal Materials and Engineering,2019,48(1):104~110.]
Effect of 0.12wt.% hydrogen addition on microstructural evolution of Ti-0.3Mo-0.8Ni alloy argon-arc welded joints
Download Pdf  View/Add Comment  Download reader
Received:July 20, 2017  Revised:November 16, 2017
DOI:
Key words: titanium alloy  welded joints  hydrogenation  microstructure  δ hydride  dislocation distribution
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Zhang Zhaohui,Liu Quanming,Liu Shifeng and Yang Haiying  
Hits: 64
Download times: 2
Abstract:
      The effects of hydrogen addition (0.12 wt.% H) on microstructural evolution in Ti-0.3Mo-0.8Ni alloy argon-arc welded joints have been investigated using optical microscope (OM), X-ray diffraction (XRD) and transmission electron microscopy (TEM) to reveal the influence of hydrogen on the characteristics of defect-free titanium alloy welded joints. The results show that hydride precipitation changed the initial microstructure of the welded joints, the increase of hydrogen content was more favorable for the beta phase precipitation. Face centered cubic δ hydride evenly distributed in the hydrogenated 0.12 wt.% H welded joints, the lamellar δ hydride could only precipitate from the lamellae alpha, and not from the transformed beta phase. Formation of δ hydride was associated with the result of αH phase separation reaction: αH→α (H lean region) + δ (H rich region), and H rich regions finally transformed to the δ phase. The dislocation distribution was heterogeneous and there was a relatively high density of dislocations in the vicinity of the precipitated δ hydride, which were caused by the lattice distortion due to the stress field generated by the hydride precipitation.