|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Friction Stir Welding and Processing IX
||Effect of Hydrogenation on Superplastic Behavior of Nugget in Friction Stir Welded Ti-6Al-4V Joints
||Z.Y. Ma, L.H. Wu, B.L. Xiao
|On-Site Speaker (Planned)
The superplastic behavior of the nuggets in friction stir welded joints of Ti-6Al-4V alloy with or without hydrogenation was investigated at temperatures of 700-925oC and at strain rates of 1×10-4~3×10-2 s-1. The nugget without hydrogenation consisted of an ultrafine lamellar microstructure 178 nm in thickness and 7.9 in aspect ratio. A maximum elongation of 740% was achieved at 925oC and 1×10-3 s-1, which were mainly attributed to the globularization of the lamellae during annealing and superplastic deformation. The hydrogenated nugget also consisted of ultrafine lamellar microstructure within lots of martensites and hydrides, which showed a much lower optimum temperature and flow stress compared to the un-hydrogenated nugget. The enhanced superplastic deformation abilities of the nugget with hydrogenation were likely attributed to the hydrogen-induced effect. The enhancing mechanism was discussed in detail.
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