Abstract
An effect of heat treatment on bending angle in laser forming of pure titanium foils was examined. Since metal sheets and foils are deformed by the thermal stress due to the volume expansion in laser forming, the bending angle is affected by the microstructure such as grain size and phase transformation with volume change. As the grain size increases, the bending angle becomes greater and when the grain size exceeds the thickness of specimen, the bending angle increases dramatically and then, it becomes almost constant. The bending angles are different by changing the initial microstructure and laser power, although the final microstructures are made same by annealing.
