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Melting, Processing and Characterization of Nb-10W-2.5Zr (Cb-752) Alloy

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Abstract

Niobium based alloys are most promising materials for high temperature aerospace and defence applications at temperature above the use of nickel base superalloys (1100 °C). Cb-752 (Nb-10W-2.5Zr) alloy pancakes were prepared by non-consumable arc melting process under argon atmosphere using thoriated tungsten electrode. In view of the very high melting point of tungsten as compared to niobium, it was found necessary to melt the pancake multiple times to ensure complete dissolution of tungsten in the alloy. The temperature of hot forging as well as method for oxidation protection during hot forging was optimised. It was observed that the alloy could be hot forged at 1300 °C. It was further found that the silicide and aluminide coatings, and evacuated stainless steel jacket protected the alloy from oxidation during hot forging. The forged pancakes were cold rolled to 1.5 mm thick sheets. The room temperature mechanical properties of Cb-752 alloy sheet produced from the pancakes were comparable to the data reported in literature.

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Acknowledgments

The authors are sincerely thankful to DRDO for financial assistance through project DMR-295 for carrying out these studies. The authors wish to thank Dr. S. V. Kamat, Director, DMRL for his keen interest and encouragement. The authors also would like to thank the staff members of ERG, PMG, ACG and SFAG for their help in experimentation.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, Telangana, 500058, India

    M. Sankar, V. V. Satya Prasad, R. G. Baligidad & A. A. Gokhale

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  1. M. Sankar
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  2. V. V. Satya Prasad
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  3. R. G. Baligidad
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  4. A. A. Gokhale
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Correspondence to M. Sankar.

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Sankar, M., Satya Prasad, V.V., Baligidad, R.G. et al. Melting, Processing and Characterization of Nb-10W-2.5Zr (Cb-752) Alloy. Trans Indian Inst Met 70, 1055–1062 (2017). https://doi.org/10.1007/s12666-016-0894-8

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  • DOI: https://doi.org/10.1007/s12666-016-0894-8

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