Effect of process parameters on stir zone microstructure in Ti–6Al–4V friction stir welds
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The effects of the main process variables on the stir zone microstructure in friction stir welds were investigated for Ti–6Al–4V. Welds were produced by employing varying welding speeds under a constant rotation speed or different rotation speeds at a constant welding speed. The stir zone microstructure was examined by optical microscopy and transmission electron microscopy. It was found that the stir zone microstructure was determined by the parameters controlling temperature and deformation history during the friction stir welding. A bimodal microstructure characterized by primary α and transformed β with lamellar α + β or a full lamellar microstructure composed of basket-weave α + β lamellae could be developed in the stir zone. The microstructural evolution mechanism in the stir zone was discussed.
KeywordsRotation Speed Titanium Alloy Friction Stir Welding Welding Speed Heat Affected Zone
The research was sponsored by the National Key Technology Research and Development Program No. 2006BAF04B09, Ministry of Science and Technology, P.R. China, and was supported by the Program of Excellent Team in Harbin Institute of Technology, P.R. China.
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