A hot deformation model for two-phase titanium alloys based on an internal state-variable approach

Mulyadi, M.; Rist, M.; Edwards, L.; Brooks, J. W. and Wilson, A. F. (2007). A hot deformation model for two-phase titanium alloys based on an internal state-variable approach. In: Niinomi, M.; Akiyama, S.; Ikeda, M.; Hagiwara, M. and Maruyama, K. eds. Ti-2007 Science and Technology, Volume 1. Sendai, Japan: The Japan Institute of Metals, pp. 315–318.

URL: http://www.sendai.kopas.co.jp/METAL/NEWBOOK/n-b_00...

Abstract

A quantitative description applicable to hot forging of alpha/beta titanium alloys that takes account of both deformation history and the two-phase nature of the material is presented. Experiments have been conducted to determine the flow behaviour of samples of single-phase alpha, single-phase beta and two-phase Ti-6Al-4V at temperatures (925-975°C) and strain rates (0.003-0.3 /s) relevant to hot forging. Semi-empirical, history-dependent constitutive equations, based on the evolution of an internal microstructural variable, are used to model the full stress-strain behaviour of the individual phases and of the two-phase material. It is found that the macroscopic behaviour of acicular Ti-6Al-4V can be predicted from that of the individual phases using a modified iso-strain approach. This takes account of temperature-dependent changes in phase volume fractions, flow properties and gross interaction mechanisms between the alpha and beta phases.

Viewing alternatives

Look up in Google Scholar
No digital document available to download for this item

Item Actions

Export

About

CORE (COnnecting REpositories)