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

Meshram, M P (2014) Friction Stir Welding of Austenitic Stainless Steel (AISI- 316) To Ti-6Al-4V and Its Joint Analyses. Masters thesis, Indian Institute of Technology Hyderabad.

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Abstract

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

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