Wear of cobalt-based alloy tool during friction stir welding of Ti-6Al-4V alloy
- Sato Y.S. ,
- Susukida S. ,
- Kokawa H. ,
- et al
- Sato Y.S. ,
- Susukida S. ,
- Kokawa H. ,
- Omori T. ,
- Ishida K. ,
- Imano S. ,
- Park S.H.C. ,
- Sugimoto I. and
- Hirano S.
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An investigation was undertaken into the wear mechanism and dominant material factors in relation to friction stir welding (FSW) tools made from precipitation strengthened, cobalt based alloys during FSW of Ti, 6%Al, 4%V alloys. Various gamma-gamma' cobalt based alloys with different chemical compositions were produced by induction melting followed by heat treatment. High temperature strength was examined by compression tests on cylindrical specimens, room-temperature Vickers hardness was measured under a load of 9.8 N and the gamma' solvus temperature was determined by differential scanning calorimetry. FSW tools were machined from heat treated ingots and welding trials were conducted at a rotational speed of 150 rpm and travel speed of 1 mm/s. Wear behaviour was assessed by performing repeated FSW trials. Reaction layers at the Co alloy/Ti-6Al-4V interface and repeated sticking and separation of Ti-6Al-4V on the tool surface are discussed.
11th International Symposium, 17-19 May 2016, Session 8A: High Temperature II, Paper 01
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