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Tensile and Fracture Properties of Commercially Pure Titanium (CP-70) Hemispherical Forgings

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Abstract

Commercially pure (CP-70) titanium is used as the metallic liner for composite overwrapped pressure vessels used in satellite launch vehicles. The metallic liner is fabricated from domes machined out of CP-70 titanium forgings. During the hot closed-die forging of CP-70 domes from billets, the amount of deformation varies location to location, due to the non-uniform flow of material in the die cavity. This non-uniform strain distribution in the hemispherical dome results in microstructural variations along the forging axis which will remain even after annealing. The aim of the present work is to study the tensile properties, impact strength and fracture toughness of CP-70 hemispherical forging in annealed condition from top end to bottom end of domes in radial and circumferential directions with a view to understand the variation in mechanical properties to asses the design margin. Study revealed significant amount of the work-hardening difference within a forged dome even after annealing.

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Acknowledgements

The authors wish to thank Director, VSSC for his permission to publish this work.

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Authors and Affiliations

  1. Materials and Metallurgy Group, Materials and Mechanical Entity, VSSC, Trivandrum, India

    P. Manikandan, G. Sudarshan Rao, Pravin Muneshwar, S. V. S. Narayana Murty, P. Ramesh Narayanan & Bhanu Pant

  2. Materials and Mechanical Entity, VSSC, Trivandrum, India

    Roy M. Cherian

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  1. P. Manikandan
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  2. G. Sudarshan Rao
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  3. Pravin Muneshwar
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  4. S. V. S. Narayana Murty
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  5. P. Ramesh Narayanan
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  7. Roy M. Cherian
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Correspondence to P. Manikandan.

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Manikandan, P., Rao, G.S., Muneshwar, P. et al. Tensile and Fracture Properties of Commercially Pure Titanium (CP-70) Hemispherical Forgings. Trans Indian Inst Met 72, 1469–1473 (2019). https://doi.org/10.1007/s12666-019-01593-4

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  • DOI: https://doi.org/10.1007/s12666-019-01593-4

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