Analysis Of Deformation And Microstructural Evolution In The Hot Forgingof The Ti-6Al-4V Alloy

Abstract

The paper presents the analysis of the three-dimensional strain state for the cogging process of the Ti-6Al-4V alloy using the finite element method, assuming the rigid-plastic model of the deformed body. It reports the results of simulation studies on the metal flow pattern and thermal phenomena occurring in the hot cogging process conducted on three tool types. The computation results enable the determination of the distribution of effective strain, effective stress, mean stress and temperature within the volume of the blank. This solution has been complemented by adding the model of microstructure evolution during the cogging process. The numerical analysis was made using the DEFORM-3D consisting of a mechanical, a thermal and a microstructural parts. The comparison of the theoretical study and experimental test results indicates a potential for the developed model to be employed for predicting deformations and microstructure parameters.

Mechanical and Microstructural Response of Near Beta Ti Alloys to Hot Tensile Testing

“…Despite the controversies over the mechanism of dynamic softening in beta [7][8][9][10][11], it has been approved that this phase can afford large deformations and lead to a safe shape change in Ti alloys. However, it is obvious that the chemical composition of beta phase has a strong effect on its mechanical properties and formability at high temperatures.…”