| 摘要 |
PURPOSE:To manufacture a sheet metal of undermentioned alloy excellent in mechanical properties and having fine and uniform structure only by applying practically ordinary rolling-reduction ratio, by subjecting a pack rolling slab in which core material prepared by applying prescribed heat treatment to an (alpha+beta)-type Ti-alloy plate to specific hot-pack rolling. CONSTITUTION:The above alloy plate is heated up to Tbeta (beta-transformation point) or above and cooled down to <=400 deg.C at >=50 deg.C/min cooling rate so as to be formed into a core material 1. After subjected to surface grinding, proper number of sheets of the above material 1 are combined, and covering materials 2 are laminated and the periphery is seam-welded in weld zones 3, so that a pack rolling slab is prepared. This slab is heated to a temp. between (Tbeta-180) deg.C and (Tbeta-50) deg.C and then rolled in >=2.5 rolling-reduction ratio and in <=1.6 cross ratio. In this way, the sheet metals excellent in material characteristics, particularly in strength and ductility, can be manufactured.
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