| 摘要 |
PURPOSE:To manufacture a Ti-alloy rolled plate excellent in mechanical strength and flatness by subjecting previously Ti-alloy rolled plates to stress relief annealing so as to straighten rolling stress and by laminating the above plates by means of spacers keeping air spaces so as to undergo solution heat treatment. CONSTITUTION:A beta-type Ti alloy such as the one of Ti-15V-3Cr-3Sn-3Al, etc., is hot-rolled at 950 deg.C to be formed into hot-rolled plates. Since these hot-rolled plates have stress such as camber H due to rolling, etc., and are not flat, five of these hot-rolled plates are piled one upon another and put between steel plates, which is heated at 700 deg.C for 2hr to undergo stress relief annealing, so that the Ti-alloy plates are flattened. Then the spacers 2 to which square pipes 2a made of steel and steel bars 2b are attached into lattice-like state are put between respective Ti alloy plates 1, which is heated at 800 deg.C for 15min and water-cooled to undergo solution heat treatment. In this way, Ti-alloy plates being flat, free from residual stress, and having high mechanical strength can be obtained.
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