Modelling Semi-Solid Behaviour and Brittle Temperature Range
In this paper, a new elastic viscoplastic micromechanical modelling is proposed to represent the semi-solid behaviour and predict the ductile-brittle transition of the C38LTT near the solidus. It is based on a viscoplastic modelling previously presented in . The originality of the new model comes from three main enhancements: the transition between the solid state and the semi-solid state was included meaning that the material properties were taken temperature-dependent, the elastic properties was taken into account similarly as  and the evolution of the internal variable describing the degree of agglomeration of the solid phase was enhanced. The model was implemented in the commercial software FORGE©. Tensile tests representing the experimental thermal conditions and obtained using a GLEEBLE© machine were simulated. The comparison of the predicted and experimental results shows that, for the first time to our knowledge, the three steps of the load-displacement response and ductile-brittle transition were successfully described.
Qiang Zhu, Ahmed Rassili, Stephen P. Midson and Xiao Gang Hu
K. Traidi et al., "Modelling Semi-Solid Behaviour and Brittle Temperature Range", Solid State Phenomena, Vol. 285, pp. 361-366, 2019