MANUFACTURE OF ROLLED TITANIUM ALLOY PLATE

摘要

PURPOSE:To obtain a rolled Ti alloy plate of high reliability by carrying out recrystallization annealing in a rolling stage and cross rolling before and after the annealing so as to prevent the formation of a locally isometric crystal structure and to reduce the amount of alpha-phase. CONSTITUTION:The ingot of an alpha- or (alpha+beta)-Ti alloy is broken down and cross rolled (A) in the alpha+beta range at >=1.2 draft and 0.6-1.4 cross ratio. The resulting plate is subjected to recrystallization annealing (B) at the beta transformation point -20 deg.C--100 deg.C, and it is cross rolled (C) in the (alpha+beta) range at >=1.6 draft and 0.6-1.4 cross ratio. The stages B, C may be repeated once or more. By this method a Ti alloy plate having the isometric alpha-crystal structure with no anisotropy can be obtd. The Ti alloy plate has superior strength and ductility.