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Melting and Microstructure Analysis of β-Ti Alloy Ti–5Al–5Mo–5V–1Cr–1Fe With and Without Boron

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Abstract

β-Titanium alloys form one of the most versatile classes of structural materials due to their high specific strength, good hardenability, crack propagation resistance and substantial ductility. β-Titanium alloy with a composition (in wt%) of Ti–5Al–5Mo–5V–1Cr–1Fe was processed by double vacuum arc remelting route. In the present work, the effect of boron addition (up to 0.12 wt%) on the as-cast microstructure and β-transus (Tβ) of the alloy was studied using characterization tools like optical microscopy, electron back scattered diffraction, scanning electron microscopy, differential scanning calorimetry (DSC) and dilatometry. It was observed that boron addition has resulted in refinement of the as-cast microstructure due to precipitation of titanium boride whiskers along the grain boundaries. The DSC and dilatometry studies on the as-cast alloy revealed significant effect of boron addition on thermal stability of the alloy.

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Acknowledgments

The authors are grateful to Director, VSSC, India and Chairman & Managing Director, M/s. Midhani, India for granting permission to publish this work. The authors express their sincere thanks to the management of MME, VSSC for the support and encouragement provided during this work. The authors are also grateful to the support extended by Titanium shop and Development teams of M/s. Midhani, Hyderabad MCD, VSSC, RE/RQS-HWC,VSSC and OIM lab team at IIT Bombay. The authors would also like to acknowledge the support received from Centre of Excellence for Steel Technology (CoEST), IIT Bombay for carrying out dilatometry studies.

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Authors and Affiliations

  1. Materials & Mechanical Entity, Vikram Sarabhai Space Centre, ISRO, Trivandrum, India

    V. Anil Kumar, S. V. S. N. Murty & R. K. Gupta

  2. Titanium Shop, Mishra Dhatu Nigam Limited, Hyderabad, India

    R. Ramesh Babu

  3. Department of Metallurgical Engineering & Materials Science, Indian Institute of Technology Bombay, Mumbai, India

    V. Anil Kumar & M. J. N. V. Prasad

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  1. V. Anil Kumar
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  2. S. V. S. N. Murty
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Correspondence to V. Anil Kumar.

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Anil Kumar, V., Murty, S.V.S.N., Gupta, R.K. et al. Melting and Microstructure Analysis of β-Ti Alloy Ti–5Al–5Mo–5V–1Cr–1Fe With and Without Boron. Trans Indian Inst Met 68 (Suppl 2), 207–215 (2015). https://doi.org/10.1007/s12666-015-0561-5

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  • DOI: https://doi.org/10.1007/s12666-015-0561-5

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