HOT DEFORMATION AND MODELING OF FLOW-STRESS FOR A TI-CONTAINING HSLA STEEL

Single-stage and double-stage interrupted hot compression tests for si mulating hot rolling have been carried out for a Ti-containing HSLA st eel (10Ti). Physical simulation of hot rolling was in progress utilizi ng a Thermecmastor-Z simulator in 850 similar to 1150 degrees C and st rain rate of 0.1 similar to 60 s(-1) A model for residual strain ratio lambda was designed, and a model of flow stress considering residual strain has been obtained. sigma = 8.176(epsilon + Delta epsilon(i)) .( epsilon) over dot(5.69x10-5T)..exp(3634/T) Delta epsilon(i) = lambda(i )[epsilon(0(i-1))+ lambda((i-1))(epsilon(0(i-2)))+ lambda((i-2))(epsil on(0(i-3)))+ ...] The hot deformation behaviour at various strain rate s has been studied.