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Micromechanical modeling of damage behavior in heat treated and non-heat treated Ti6Al4V Superalloy

By Ali Cheloee Darabi (Shahid Rajaee Teacher Training University)
Co-authors: Shima Rastgordani (Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran)
Javad Kadkhodapour (Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran)
Ali Pourkamali Anaraki (Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran)
Siegfried Schmauder (Institute for Materials Testing, Materials Science and Strength of Materials (IMWF), University of Stuttgart, Stuttgart, Germany)


Ti–6Al–4V is one of the most critical super alloys due to its duel phase microstructure consisting α and β phases that effects on its wide applications in biomedical science, aerospace and etc. Many studies have already tried to develop the simulation methods for predicting the effect of microstructural morphology in mechanical properties and failure mechanism of this alloy, but little is known about micromechanical simulation of its damage mechanism. Therefore, this study investigates the damage initiation and growth with the help of the flow curves of two heat-treated and non-heat treated of Ti–6Al–4V superalloy. To describe the ductile damage in the α phase, the Gurson-Tvergaard-Needleman (GTN) damage model was used with the failure in the β phase being ignored. Micromechanical damage analysis were validated by the experimental result behavior prediction of material like the evidences that were observed during the tensile test. The stress-strain curve, damage mechanism obtained from 2D micromechanical models were also compared with the experimental results and the good correlation of them shows that how efficient this proposed model could be for Ti–6Al–4V damage mechanism prediction. Keywords: Micromechanical modeling, Ti–6Al–4V, GTN damage model, Damage mechanism.

Ⓒ Photos:Toerisme Leuven