Rheological model for microalloyed steels in a wide range of temperatures By Maciej Pietrzyk and Roman Kuziak
Flow stress, inverse analysis, rule of mixture, microalloyed steel
The objective of the present work is development of a constitutive model for microalloyed niobium steels deformed in a wide range of temperatures between 550 °C and 1100 °C. Three models of various complexity were considered and the identification of parameters of these models was performed on the basis of results of uniaxial compression tests. This objective is reached in two steps. The coefficients in the flow stress models were evaluated using the inverse analysis of the performed plastometric tests. The flow stress models were determined independently for austenite and ferrite phases. The two models were combined and the rule of mixture was applied in modelling metal flow in the two-phase region. The results of predictions of loads during compression of samples in the two-phase region were compared with the experimental data obtained by conducting the deformation tests on the Gleeble 3800 simulator. Predictive capabilities of the models were evaluated.
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