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

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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.

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ACKNOWLEDGMENTS

The authors are thankful to the Director of VNIT Nagpur for providing the necessary facilities and constant encouragement to publish this paper. The authors would like to acknowledge the use of National Facility for Texture and OIM (A DST-IRPHA project), IIT Bombay for EBSD measurements. One of the authors RKK wishes to acknowledge Science and Engineering Research Board (SERB) for financial assistance (grant no. EEQ/2016/000408 dated 08/02/2017) to carry out this work.

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  1. Manendra Singh Parihar

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

Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology (VNIT), Nagpur, Maharashtra, 440010, India

    Aman Gupta, Rajesh Kisni Khatirkar, Amit Kumar & Manendra Singh Parihar

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  1. Aman Gupta
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Correspondence to Rajesh Kisni Khatirkar.

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Gupta, A., Khatirkar, R.K., Kumar, A. et al. Investigations on the effect of heating temperature and cooling rate on evolution of microstructure in an α + β titanium alloy. Journal of Materials Research 33, 946–957 (2018). https://doi.org/10.1557/jmr.2018.54

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