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Effect of Cyclic Oxidation Exposure on Tensile Properties of a Pt-Aluminide Bond-Coated Ni-Base Superalloy

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Abstract

The tensile behavior of a directionally solidified (DS) Ni-base superalloy, namely, CM-247LC, was evaluated in the presence of a Pt-aluminide bond coat. The effect of the thermal cycling exposure of the coated alloy at 1373 K (1100 °C) on its tensile properties was examined. The tensile properties were evaluated at a temperature of 1143 K (870 °C). The presence of the bond coating caused an approximately 8 pct drop in the strength of the alloy in the as-coated condition. However, the coating did not appreciably affect the tensile ductility of the substrate alloy. The bond coat prevented oxidation-related surface damage to the superalloy during thermal cycling exposure in air at 1373 K (1100 °C). Such cyclic oxidation exposure (up to 750 hours) did not cause any further reduction in yield strength (YS) of the coated alloy. There was a marginal decrease in the ultimate tensile strength (UTS) with increased exposure duration. Because of the oxidation protection provided by the bond coat, the drastic loss in ductility of the alloy, which would have happened in the absence of the coating, was prevented.

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Acknowledgments

The authors acknowledge the technical assistance provided by the SFAG, EMG, and MBG groups of DMRL. They are thankful to the director, DMRL, for his permission to publish the present work. This research work was sponsored by the Defence Research and Development Organization (DRDO).

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Authors and Affiliations

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

    Md. Zafir Alam (Scientist), N. Hazari (Scientist) & Dipak K. Das (Scientist)

  2. Centre for Military Airworthiness & Certification, Bangalore, 560093, India

    Vijay K. Varma (Scientist)

Authors
  1. Md. Zafir Alam
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  2. N. Hazari
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  3. Vijay K. Varma
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  4. Dipak K. Das
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Correspondence to Md. Zafir Alam.

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Manuscript submitted January 2, 2011.

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Zafir Alam, M., Hazari, N., Varma, V.K. et al. Effect of Cyclic Oxidation Exposure on Tensile Properties of a Pt-Aluminide Bond-Coated Ni-Base Superalloy. Metall Mater Trans A 42, 4064–4074 (2011). https://doi.org/10.1007/s11661-011-0803-z

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