HOT DEFORMATION CHARACTERISTICS AND MICROSTRUCTURE DEVELOPMENT OF Ti-6AI-4V BAR UNDER FORGING CONDITIONS

1.Introduction Ti-6Al-4VisadualphasealloyconsistingofaandPphases.Itexhibitsgoodformability,highstrengthtoweightratioaswellashighstrengthatelevatedtemperature.ForgingofTi-6AL4ValloyisgenerallyconductedinthetemperaturerangewhereCh fiorPmicrostructureexists.ExtensiveresearchonmicrostructuresofTi--alloyafterthermalmechanicaltreatmentshasbeenreported1--3].Thesequenceofdeformationandthermaltreatmentduringtheforgingprocessdeterminethemicrostructureoftheforgedparts415]andthiscanresultinsigni…