TWI

Haynes Alloy 282 (Ni, 19.45%Cr, 10.28%Co, 8.55%Mo) was deposited onto Inconel 600 substrates (Ni, 16.69%Cr, 9.36%Fe) using a cold-wire TIG process, subjected to additive friction stir processing (AFSP) to create gamma-strengthened surface layers, and the resulting microstructure and microhardness characteristics were investigated. Shallow weld overlays of Alloy 282 were deposited at a welding speed of 1.27 mm/s, current of 105 A, voltage of 9.8 V and wire feed speed of 6.56 mm/s. Friction stir processing was performed on an Accustir gantry-style friction stir welding machine using a water-cooled W-Re tool. Specimen microstructures and precipitate distributions were observed by SEM and electron backscatter diffraction. Microhardness mapping was conducted using an automated hardness tester. The effect of post-AFSP ageing heat treatments is discussed.

9th International Symposium, 15-17 May 2012, Session 5B: FSP, Paper 01