Physical simulation of friction stir weld microstructure of a high-strength, low alloy steel (HSLA-65)
- Sinfield M.F. ,
- Lippold J.C. and
- Alexandrov B.T.
- Sinfield M.F. ,
- Lippold J.C. and
- Alexandrov B.T.
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Modified Gleeble hot torsion testing was used to simulate four microstructure regions in HSLA-65 steel (0.07%C, 0.24%Si, 1.5%Mn, 0.14%Cr, 0.34%Ni, 0.25%Cu, 0.06%Mo) joints fabricated by friction stir welding (FSW) and the results were verified by optical microscopy observations and Vickers microhardness measurements. Bead-on-plate partial penetration FSW joints were made on HSLA-65 plate (thickness 12.7 mm). Modified Gleeble hot torsion testing was conducted under a vacuum of 0.021 torr followed by double back purging with argon. The microstructure regions studied were a coarse grained stir zone, a transition region between stir zone and HAZ, an inner HAZ and an outer HAZ. Issues discussed include strain rate evolution, microstructure thermomechanical history and cooling rate effects.
7th International Symposium, 20-22 May 2008, 6B: Steel 2, Paper 03
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