| 摘要 |
PURPOSE:To manufacture a large-sized turbine blade preventing perfectly deformation and residual stress by successively subjecting a turbine blade die-forged in a horizontal state to twisting, forced restraint leveling and heat treating. CONSTITUTION:A Ti-6Al-4V ingot is broken down and rough-forged to form a large-sized turbine blade 1. This blade 1 is die-forged in the (alpha+beta) range from the direction of an arrow with dies for keeping the whole blade 1 from the root 2 to the tip 3 in a horizontal state. The root 2 is then fixed and the blade 1 is successively subjected to hot twisting in the (alpha+') range at a prescribed angle over the full length, forced restraint leveling, cooling to <=about 300 deg.C in the restrained state and annealing at about 700-750 deg.C. A large-sized turbine blade 1 twisted to a complex three-dimensional shape is manufactured.
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