Friction Stir Welding of Austenitic Stainless Steel (AISI-\ud 316) To Ti-6Al-4V and Its Joint Analyses

In this project, possibility of joining dissimilar AISI-316 stainless steel to Ti-6Al-4V\ud by friction stir welding was studied. Firstly, similar plates of AISI-316 stainless steel\ud were welded using PCBN tool. Secondly similar plates of Ti-6Al-4V were welded\ud using the same tool. All welds were mechanically tested by tensile strength,\ud hardness measurement and microstructural studies had been carried using optical\ud microscopy and EBSD analysis.\ud A defect free weld of AISI-316 was obtained with welding parameters of rotation\ud speed 1100 RPM and welding speed of 8 mm/min. Ultimate tensile strength of this\ud welded sample was obtained just above the base material with an increase in\ud hardness in the nugget zone. In EBSD analysis of stir zone C {001} <110> shear\ud component in the stir zone (except for B {hkl} <110> partial fiber in Region 2) in\ud the present low stacking fault stainless steel indicates predominant shear texture\ud along the <110> direction