Microstructural simulation in hot rolling of aluminium alloys

Within the present work, the modelling of hot working and microstructure evolution of different aluminium alloys during multistage hot rolling is carried out. In order to determine material data for the formulation of the stress-strain behaviour, hot compression tests are carried out. By use of interrupted compression tests, information on static softening is obtained. Furthermore, analyses were carried out to distinguish between effects of static recovery and static recrystallisation. Herewith, a quantitative formulation of static recrystallisation kinetics on the basis of the Avrami-equation was facilitated. Grain size evolution due to static recrystallisation was determined by optical microscopy employing the hot compression samples used for stress-strain-curve measurement. The constitutive equations derived from experimental work are incorporated into a microstructural model and linked to the plastomechanic simulation. By use of this tool laboratory hot rolling trials are simulated.