The microstructure and mechanical properties of Ti-63 pancakes were investigated under different heat-treatment modes. Pancake No. 1, with an as-forged bimodal structure, was β annealed at 930℃ for 1 h. Its structure was changed to a Widmanstatten structure with continuous grain boundary α phase and long lamellar α phase. The pancake showed a good combination of strength, ductility and fracture toughness. Pancake No.2, with an as-forged bimodal structure, was aged at 540℃ for 8 h after annealing at 930℃ for 1 h. Other than the fine secondary α precipitates, it showed a similar mierostructure to that of pancake No.1. The fine precipitates can enhance the pancake's strength while reducing the ductility and fracture toughness. Pancake No.3, with an as-forged basket-weave structure, was annealed at 750℃ for 1 h. Its structure was nearly unchanged and it achieved a better ductility but a slightly lower fracture toughness than pancake No.1.
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