COLD ROLLING METHOD FOR TI-6AL-4V SHEET

摘要

PURPOSE:To efficiently manufacture the Ti-6Al-4V cold rolled sheet having no surface crack and working distortion by combining cold rolling total rolling reduction rate, annealing temp. and holding time so as to satisfy a specified equation in case of manufacturing a Ti-6Al-4V sheet. CONSTITUTION:The total rolling reduction rate (rt) in cold rolling, the annealing temp. (Temp) of a batch type annealing furnace and holding time (Time) are combined so as to satisfy an equation in case of manufacturing a Ti-6Al-4V sheet by using a cold rolling stage and batch type annealing stage. In the equa tion rt0.5, 750 deg.CTemp950 deg.C, 3minTime120min and X1 are taken. The working distortion of the cold rolled Ti-6Al-4V sheet is thus completely removed, the generation of a surface crack due to cold rolling is prevented and yet the heat treatment can thus be efficiently executed at low cost.