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Investigations on the effect of heating temperature and cooling rate on evolution of microstructure in an α + β titanium alloy

Published online by Cambridge University Press:  03 April 2018

Aman Gupta Open the ORCID record for Aman Gupta [Opens in a new window] ,
Rajesh Kisni Khatirkar Open the ORCID record for Rajesh Kisni Khatirkar [Opens in a new window] ,
Amit Kumar Open the ORCID record for Amit Kumar [Opens in a new window]  and
Manendra Singh Parihar Open the ORCID record for Manendra Singh Parihar [Opens in a new window]
Aman Gupta
Affiliation:
Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur-440010, Maharashtra, India
Rajesh Kisni Khatirkar*
Affiliation:
Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur-440010, Maharashtra, India
Amit Kumar
Affiliation:
Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur-440010, Maharashtra, India
Manendra Singh Parihar
Affiliation:
Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur-440010, Maharashtra, India
*
a)Address all correspondence to this author. e-mail: rajesh.khatirkar@gmail.com, rajeshk@mme.vnit.ac.in
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Abstract

In the present work, the effect of cooling rate on the evolution of the microstructure and mechanical properties of an α + β titanium alloy has been systematically investigated. Titanium alloy samples were heated to 1066 °C (above the β transus), 930 °C (just below the β transus), and 850 °C (well below the β transus) followed by oil quenching, air cooling, and furnace cooling, respectively. Primary alpha (αp), lamellar alpha (αL), and martensite (α′) were the dominant features of the microstructures for all the samples heated below the β transus. Furnace-cooled samples showed variation in the size and shape of the αp and fraction of αL according to the heating temperature. At slower cooling rates, the thickness of the αL increased with the increase in temperature. Transmission electron microscopy and X-ray diffraction confirmed the presence of α′ in all the quenched samples. The volume fraction and size of the αp decreased with the increase in temperature but was independent of the cooling rate. The microhardness was relatively unaffected by the cooling rate for heating just below the β transus, i.e., 930 °C. The modulus of elasticity was found to be extremely sensitive to the microstructure.

Keywords

microstructuremartensiteEBSDtransmission electron microscopy (TEM)grain shapealloyTi
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 8 , 27 April 2018 , pp. 946 - 957
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

b)

Present address: Tata Research Development and Design Centre, Pune-411013, Maharashtra, India.

Contributing Editor: Jürgen Eckert

References

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