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Metallurgical Analysis on Leaked XH-43 Superalloy LH2 Exhaust Casing Investment Casting

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Abstract

Ni–Fe-based superalloy XH-43 is extensively used in aerospace applications due to high creep resistance, oxidation resistance and retention of its mechanical properties at higher temperatures. Complex geometrical components like LH2 exhaust casings are made through investment casting process. In the present case, leakage was observed in an exhaust casing casting during helium leak check after the high temperature–pressure test. Investigation through detailed X-ray microscopy analysis and optical microscopy revealed interconnected micro-shrinkage porosities opening to the surface at a corner location. The cause of leakage is attributed to the presence of longer through-thickness interconnected shrinkage porosities in the casting.

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Acknowledgements

Authors wish to place on record their deep sense of gratitude Deputy Director, Materials and Mechanical Entity for their encouragement and support during the course this work. Authors wish to thank SAC, Ahmadabad team for X-ray microscopy support. Director, VSSC for permission to publishing work.

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Authors and Affiliations

  1. Materials and Mechanical Entity, Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram, Kerala, India

    Yerrinaidu Lagudu, Alok Agarwal, Sushant K. Manwatkar, Rohit Kumar Gupta & Govind Bajargan

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  1. Yerrinaidu Lagudu
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  2. Alok Agarwal
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  3. Sushant K. Manwatkar
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  4. Rohit Kumar Gupta
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Correspondence to Yerrinaidu Lagudu.

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Lagudu, Y., Agarwal, A., Manwatkar, S.K. et al. Metallurgical Analysis on Leaked XH-43 Superalloy LH2 Exhaust Casing Investment Casting. J Fail. Anal. and Preven. 23, 1265–1274 (2023). https://doi.org/10.1007/s11668-023-01660-5

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  • DOI: https://doi.org/10.1007/s11668-023-01660-5

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