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Hot deformation behavior and processing maps of Ti–6Al–4V alloy with starting fully lamellar structure

Published online by Cambridge University Press:  17 September 2018

Wenjing Zhang ,
Hua Ding ,
Jingwei Zhao ,
Bo Yang  and
Wenjing Yang
Wenjing Zhang
Affiliation:
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Hua Ding*
Affiliation:
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Jingwei Zhao
Affiliation:
School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, NSW 2522, Australia
Bo Yang
Affiliation:
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
Wenjing Yang
Affiliation:
School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
*
a)Address all correspondence to this author. e-mail: hding@263.net
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Abstract

The hot deformation behavior of Ti–6Al–4V alloy with starting fully lamellar microstructure was investigated by conducting isothermal hot compression tests at the temperature of 700–1000 °C and strain rate of 0.001–10 s−1. The deformation activation energy is calculated to be 342 kJ/mol at temperatures from 750 to 850 °C, whereas the higher apparent activation energy of 610 kJ/mol is obtained at a high temperature regime of 900–1000 °C. The relationship between the dynamic softening behavior and deformation parameters was analyzed by power dissipation efficiency η, which shows an increasing trend as the deformation temperature increases and strain rate decreases, respectively. Processing maps were constructed. The instability flow is dominated by the presence of adiabatic shear bands, and the dynamic softening is mainly caused by a combination effect of dynamic recrystallization and dynamic recovery. Moreover, straining is found to have a positive effect on lowering the phase transformation temperature.

Keywords

Ti–6Al–4V alloyhot deformationactivation energypower dissipation efficiencyprocessing map
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 22 , 28 November 2018 , pp. 3677 - 3688
Copyright
Copyright © Materials Research Society 2018 

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