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The effect of heat treatment on the mechanical properties of Ti–6Al–4V alloy produced by consolidating a high impurity blended powder mixture using a combination of powder compact hot pressing and extrusion

Published online by Cambridge University Press:  26 February 2019

Ajit Pal Singh Open the ORCID record for Ajit Pal Singh [Opens in a new window] ,
Fei Yang ,
Rob Torrens  and
Brian Gabbitas
Ajit Pal Singh*
Affiliation:
Waikato Centre for Advance Materials, School of Engineering, University of Waikato, Hamilton 3240, New Zealand
Fei Yang
Affiliation:
Waikato Centre for Advance Materials, School of Engineering, University of Waikato, Hamilton 3240, New Zealand
Rob Torrens
Affiliation:
Waikato Centre for Advance Materials, School of Engineering, University of Waikato, Hamilton 3240, New Zealand
Brian Gabbitas
Affiliation:
Waikato Centre for Advance Materials, School of Engineering, University of Waikato, Hamilton 3240, New Zealand
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this study, a rapid powder consolidation method combining powder compact hot pressing and extrusion was utilized to consolidate relatively cheap, high impurity blended powder mixture Ti–6Al–4V alloy. The purpose of this work was to investigate whether a suitable microstructure deriving from a particular heat treatment balance out or compensate for the presence of high interstitial impurity contents. From mechanical property data attained, it was clear that annealing in high α–β region gave a much better combination of mechanical properties: impact toughness (14 J), yield strength (878 MPa), ultimate tensile strength (1092 MPa), and ductility/plastic strain (6.2%) compared to as-extruded material despite the presence of 0.44 wt% oxygen. Therefore, it can be concluded that optimization of microstructures provides improvement to the fracture related properties and Ti–6Al–4V produced in this way is suitable for less demanding applications. For further enhancement in properties, utilization of low oxygen starting powders is vital.

Keywords

powder metallurgymicrostructurefracture
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 8 , 29 April 2019 , pp. 1426 - 1438
Copyright
Copyright © Materials Research Society 2019 

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