Volume 3, 2016
|Number of page(s)||10|
|Published online||23 September 2016|
Unified constitutive modelling for two-phase lamellar titanium alloys at hot forming conditions
School of Mechanical Engineering, University of Science and Technology Beijing, Beijing
2 Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK
* e-mail: firstname.lastname@example.org
Accepted: 4 September 2016
In this paper, a set of mechanism based unified viscoplastic constitutive equations have been established for two-phase titanium alloys with initial lamellar microstructure, which models the softening mechanisms of the alloys in hot forming conditions. The dislocation density, rotation and globularization of lamellar α-phase and their effects on flow behaviour can also be modelled. The values of material constants in the equation set have been calibrated, according to stress-strain curves and globularization fractions of lamellar α-phase obtained from compression tests at a range of temperatures and strain rates, using a genetic algorithm (GA) based optimisation method. Based on the determined constitutive equations, flow stress and globularization evolution of Ti-17 and TA15 alloys at different temperatures and strain rates were predicted. Good agreements between the experimental and computed results were obtained.
Key words: Hot forming / Unified viscoplastic constitutive equations / Lamellar microstructure / Softening mechanism / Two-phase titanium alloys / Globularization
© L. Yang et al., Published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.