| 摘要 |
PURPOSE:To produce an alpha type titanium alloy hot rolled plate having less hot rolling cracks and having excellent quality by hot retaining the alpha type titanium alloy to a beta transus temp. or above, thereafter cooling the alloy, furthermore heat retaining it to the beta transus temp. or below and then hot rolling said alloy. CONSTITUTION:The alpha type titanium alloy or near alpha type titanium alloy is heated to the beta transus temp. of the alloy - beta transus temp. +150 deg.C, is subjected to a solution heat treatment and is furthermore heat retained at this temp. to uniformly convert the components into a solid solution. Said alloy is then cooled to <=500 deg.C at >=10 deg.C/sec cooling ratio to obtain an alpha phase which has less inclination of the components. Said alloy is thereafter heat retained between the beta trunsus temp. of the alloy -150 deg.C-beta transus temp. -150 deg.C, is successively hot rolled at >=30% total draft ratio, by which both of the hard a phase and soft beta phase are finely and closely distributed therebetween and the beta phase is transformed into the alpha phase. A hot rolled plate or a hot coil for cold rolling made of the alpha type and near a type titanium alloy having small material anisotropy, having good quality and having no cracks on the both end faces of the hot rolled plate is thereby obtd. in a high yield.
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