Table of Contents
Journal of Metallurgy
Volume 2012 (2012), Article ID 989834, 6 pages
http://dx.doi.org/10.1155/2012/989834
Research Article

Prediction of Microstructure Evolution in Hot Backward Extrusion of Ti-6Al-4V Alloy

1Special Alloys Group, Korea Institute of Materials Science, 531 Changwondaero, Changwon 641-831, Republic of Korea
2Department of Materials Science and Engineering, POSTECH, San 31, Hyojadong, Namgu, Pohang 790-784, Republic of Korea

Received 28 September 2011; Accepted 21 October 2011

Academic Editor: Enrico Evangelista

Copyright © 2012 Jong-Taek Yeom et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Microstructure evolution of Ti-6Al-4V alloy during hot backward extrusion process was simulated with the combined approaches of finite element method (FEM) and microstructure prediction model. From experimental analysis, it can be found that the change of microstructure during hot forming process of titanium alloy has a close relation to α/β phase transformation and grain growth behaviour. A microstructure prediction model was established by considering the change of volume fractions and grain size of both phases varying with process variables and then implemented into the user-defined subroutine of FEM analysis. In order to demonstrate the reliability of the model, the volume fraction and grain size of primary α phase during the hot backward extrusion process of Ti-6Al-4V alloy were simulated. The simulation results were compared with the experimental ones.