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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.

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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.

Item Type: Book Chapter
ISBN: 4-88903-406-4, 978-4-88903-406-6
Extra Information: The book is the Proceedings of Ti-2007, The 11th World Conference on Titanium held in Kyoto on June 3-7, 2007.
Academic Unit/Department: Mathematics, Computing and Technology > Engineering & Innovation
Mathematics, Computing and Technology
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Item ID: 16439
Depositing User: Martin Rist
Date Deposited: 26 May 2009 13:05
Last Modified: 15 Jan 2016 11:26
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