Constitutive analysis of hot deformation behavior of a Ti6Al4V alloy using physical based model

Souza, Paul M., Beladi, Hossein, Singh, Rajkumar, Rolfe, Bernard and Hodgson, Peter D. 2015, Constitutive analysis of hot deformation behavior of a Ti6Al4V alloy using physical based model, Materials science and engineering A, vol. 648, pp. 265-273, doi: 10.1016/j.msea.2015.09.055.

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Title Constitutive analysis of hot deformation behavior of a Ti6Al4V alloy using physical based model
Author(s) Souza, Paul M.
Beladi, HosseinORCID iD for Beladi, Hossein
Singh, Rajkumar
Rolfe, BernardORCID iD for Rolfe, Bernard
Hodgson, Peter D.
Journal name Materials science and engineering A
Volume number 648
Start page 265
End page 273
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-11-11
ISSN 0921-5093
Keyword(s) EBSD
Thermomechanical processing
Titanium alloys
Summary The effect of deformation parameters on the flow behavior of a Ti6Al4V alloy has been studied to understand the deformation mechanisms during hot compression. Cylindrical samples with partially equiaxed grains were deformed in the α+β phase region at different thermo-mechanical conditions. To develop components with tailored properties, the physically based Estrin and Mecking (EM) model for the work hardening/dynamic recovery combined with the Avrami equation for dynamic recrystallization was used to predict the flow stress at varying process conditions. The EM model revealed good predictability up to the peak strain, however, at strain rates below 0.01s-1, a higher B value was observed due to the reduced density of dislocation tangles. In contrast, the flow softening model revealed higher value of constants a and b at high strain rates due to the reduction in the volume fraction of dynamic recrystallization and larger peak strain. The predicted flow stress using the combined EM+Avrami model revealed good agreement with the measured flow stress resulted in very low average absolute relative error value. The microstructural analysis of the samples suggests the formation of coarse equiaxed grains together with the increased β phase fraction at low strain rate leads to a higher flow softening.
Language eng
DOI 10.1016/j.msea.2015.09.055
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
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Document type: Journal Article
Collections: Institute for Frontier Materials
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