Friction stir processing of Ti-6Al-4V for grain size reduction in fusion welds and base metals
- Livingston J.J. ,
- Rodelas J.M. and
- Lippold J.C.
- Livingston J.J. ,
- Rodelas J.M. and
- Lippold J.C.
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Description
Friction stir processing (FSP) experiments were undertaken to modify the microstructure of Ti-6%Al-4%V parent metal specimens, in both alpha/beta and beta processed conditions, and TIG weld overlays deposited onto Ti, 6%Al, 4%V alloy using matching filler metal. FSP was performed at temperatures above and below the beta-transus on an Accu-Stir machine using a travel speed of 50.8 or 76.2 mm/min, spindle speed of 150 or 450 rpm and a plunge depth of 0.61 or 0.76 mm. In situ thermal and force measurements were used to determine processing temperatures and forces. Microstructure was observed by optical microscopy and SEM. Issues discussed include weld metal grain diameter reduction after FSP above the beta-transus and the use of process force control to establish FSP process parameters.
9th International Symposium, 15-17 May 2012, Session 11B: High Temperature FSW II, Paper 02
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