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Microstructure Evolution during Hot Working of Nb-10Hf-1Ti Refractory Alloy

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Abstract

Microstructure evolution during hot working of Nb-10Hf-1Ti (C-103) alloy has been studied at various temperatures (1273–1473 K) and strain rates (0.01–10 s−1) using a Gleeble™ thermo-mechanical simulator. Flow behavior of the material has been analyzed, processing maps were generated and correlated with the microstructures. Flow stress variation with increasing temperature and decreasing strain rate has been very minimal except in the higher temperature and lower strain rate regime. Enrichment of Hf, C and N was observed at the second phase particle- grain boundary interface in samples deformed at lower strain rate and high temperature. Presence of Hf(C,N) was confirmed through SEM–EDS and these second phase particles may result in high resistance to deformation at this regime depending on their size and distribution. Lower temperature working in combination with static recrystallization or higher temperature working with inherent dynamic recrystallization can be employed for deformation. Strain rate of 0.1–0.01 s−1 and temperature range of 1373–1473 K is identified as a safe working zone for this alloy under a protective atmosphere.

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Code availability

The code used for development of processing maps is written in MATLAB and is available with one of the co-authors.

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Acknowledgements

The authors are thankful to DD, MME for valuable suggestions during this work and Director, VSSC for granting permission to publish this work. The authors are also thankful to MCD, VSSC and HWMD, VSSC for microscopy support; SAIL-RDCIS, Ranchi for Gleeble facility support and National facility for Texture and OIM, IIT Bombay for EBSD support.

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This work did not receive any funding from any external funding agency.

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Correspondence to V. Anil Kumar.

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Gupta, R.K., Kumar, V.A., Venkateshwaran, T. et al. Microstructure Evolution during Hot Working of Nb-10Hf-1Ti Refractory Alloy. Trans Indian Natl. Acad. Eng. 6, 111–121 (2021). https://doi.org/10.1007/s41403-020-00194-8

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