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Effect of heating temperature and cooling rate on the microstructure and mechanical properties of a Mo-rich two phase α + β titanium alloy

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Abstract

In this work, influence of heating temperature and cooling rate on microstructure and mechanical properties of a Ti–6Al–1V–4Mo–Si alloy was investigated. The samples were heated to β (1020 °C) and α + β (950 °C and 850 °C) phase field followed by furnace cooling, air cooling and oil quenching. Basketweave morphology was witnessed for samples furnace cooled from β phase field, while Widmanstatten microstructure was observed for most air-cooled samples. For samples oil quenched from β phase field, HCP martensite (αʹ) was formed, while for samples heated in α + β phase field, lamellar α with α′ was observed. Oil quenching from the β phase field resulted in high strength and low elongation. The strength decreased and elongation increased with reduction in the heating temperature. Highest elongation (~ 16%) was obtained for samples heated to 850 °C followed by furnace cooling. The elastic modulus displayed a wide range of values (70–150 GPa) depending on the processing conditions.

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Acknowledgments

The authors would like to thank The Director, VNIT Nagpur for providing the necessary facilities and constant encouragement to publish this paper. The authors would also like to acknowledge the use of ‘National Facility of Texture & OIM’ (a DST-IRPHA facility), IIT Bombay for EBBSD measurements. One of the authors, RKK, wishes to acknowledge Science and Engineering Research Board (SERB) for financial assistance to carry out this work (Grant No. EEQ/2016/000408).

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

    Diksha Mahadule, Rajesh Kisni Khatirkar & Aman Gupta

  2. Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India

    Ranjeet Kumar

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  1. Diksha Mahadule
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Correspondence to Rajesh Kisni Khatirkar.

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Mahadule, D., Khatirkar, R.K., Gupta, A. et al. Effect of heating temperature and cooling rate on the microstructure and mechanical properties of a Mo-rich two phase α + β titanium alloy. Journal of Materials Research 36, 751–763 (2021). https://doi.org/10.1557/s43578-020-00100-6

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