Prediction of the kinetics of the phase transformations and the associated microstructure during continuous coolingin the Ti17
Résumé
The aim of this paper is to present recent experimental results and related simulation about the $\beta$ -> $\alpha$GB + $\alpha$WGB and -> $\alpha$WI transformations which occur in the Ti17 alloy during the thermal treatments following the heating in the $\beta$ phase field. These phase transformations were experimentally studied under isothermal conditions in samples with negligible thermal gradients. The IT diagram was obtained, on the basis of electrical resistivity measurements and microstructural SEM observations. The kinetics of the phase transformation was further numerically simulated for continuous cooling on the basis of a formerly developed model giving the amount of each morphology ($\alpha$WGB, $\alpha$WI). Experimental and calculated results are compared.