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Role of Ti on Phase Evolution, Oxidation and Nitridation of Co–30Ni–10Al–8Cr–5Mo–2Nb–(0, 2 & 4) Ti Cobalt Base Superalloys at Elevated Temperature

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Abstract

Titanium is an important alloying addition to γ/γ′ cobalt-based superalloys that enhances the high temperature microstructural stability and make the alloys lighter. In this work, we probe the role of Ti composition on the phase stability and oxidation behavior of Co–30Ni–10Al–8Cr–5Mo–2Nb superalloys. With Ti addition, the γ′-solvus temperature is enhanced and the γ′-precipitate shape changes from spherical to rounded cuboids. Addition of 4 at. pct Ti to the alloy promotes topologically-close-packed (TCP) phase formation that are rich in Co, Cr, and Mo. During oxidation at 900 °C, Ti was found to facilitate the early formation of passivating oxide layers (spinel CoCr2O4/CoAl2O4) on the exposed surfaces, however, it was not effective in reducing the oxidation-induced mass gain. Microstructural analysis reveals that Ti delays the Al2O3 layer formation eventually leading to faster oxidation kinetics. Additionally, we also found formation of (Ti,Nb)N in the γ′ denuded zones near the alloy-oxide interface.

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Acknowledgments

The authors would like to acknowledge the microscopy facility available at the Advanced Facility for Microscopy and Microanalysis (AFMM) center, Indian Institute of Science, Bangalore. KC is grateful for the financial support from the Department of Science and Technology (DST) in the form of a SERB Distinguished Fellowship. KC also acknowledges the Gas Turbine Materials and Processes (GTMAP) program of the Aeronautics Research and Development Board, DRDO, Government of India for the financial support.

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Authors and Affiliations

  1. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India

    Apurba Roy, Saurabh Mohan Das, Surendra Kumar Makineni & Kamanio Chattopadhyay

  2. Interdisciplinary Center of Energy Research, Indian Institute of Science, Bangalore, 560012, India

    Mahander Pratap Singh & Kamanio Chattopadhyay

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  1. Apurba Roy
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Manuscript submitted April 27, 2021; accepted August 21, 2021.

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Roy, A., Singh, M.P., Das, S.M. et al. Role of Ti on Phase Evolution, Oxidation and Nitridation of Co–30Ni–10Al–8Cr–5Mo–2Nb–(0, 2 & 4) Ti Cobalt Base Superalloys at Elevated Temperature. Metall Mater Trans A 52, 5004–5015 (2021). https://doi.org/10.1007/s11661-021-06445-9

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