Abstract
Similar friction stir (FS) welds were produced for three titanium alloys with identical rotational and traverse speeds. Defect free welds were obtained under adopted processing conditions; 300 RPM and 100 mm/ min. The base material (BM) consist of typical α and β phases in all three alloys. For ATI-425, TIMET-54M, and Ti-6Al-4V the BM microstructure is, primary α infused with intergranular β; equiaxed α; and equiaxed α respectively. FSW produced Widmanstätten morphology in the weld nugget (WN) for all cases except Ti-6Al-4V, demonstrating the temperatures reaching par β transus in WN. The heat affected zone (HAZ), and thermo-mechanically affected zone (TMAZ) for TIMET-54M, and Ti-6Al-4V consist of refined bimodal, and equiaxed α grains respectively. HAZ, for ATI-425 results in refined equiaxed α infused with β. The hardness has increased in the WN for all the cases; however, the presence of HAZ is marked by the drop in the hardness values because of recrystallized grains in the HAZ. The fracture occurred in the WN, for ATI-425; in the base material for TIMET-54M; and in the retreating side HAZ/TMAZ for Ti-6Al-4V in this study.
Published Version
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