Abstract
Cracking and coarse textured grains are responsible for insufficient mechanical properties of laser beam welded TiAl alloys. Conventional method for grain refinement such as addition of boride is suppressed by high cooling rate during laser welding. This article delineates texture refinement by laser beam oscillation for TiAl alloy. Large textured grains are formed with no beam oscillation. When the oscillation increases to 300 Hz, the vortex and turbulence severely disturb the welding pool solidification and cause reduction of grain size down to 41% of the size without oscillation. The size of textured grain does not show a further reduction with 500 Hz oscillation. Both ultimate tensile strength and elongation are improved with refined grain size.
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