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The Effect of Microstructure on the Type II Hot Corrosion of Ni-Base MCrAlY Alloys

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Abstract

Alloys of compositions (in wt%) Ni–31.5Cr–11.5Al–0.6Y and Ni–20.9Co–19.2Cr–12.5Al–0.5Y–0.4Si–0.3Hf were prepared using three different processing routes and exposed to Type II (700 °C) hot corrosion conditions in order to evaluate the influence of microstructural scale on degradation resistance. The alloys were prepared in bulk form by drop casting (DC) and injection casting (IC), and as a coating by low-pressure plasma spraying (LPPS) on a René N5 superalloy substrate. The resulting microstructures became coarser in the order LPPS < IC < DC for the NiCoCrAlY, and IC < LPPS < DC for the NiCrAlY. The DC and LPPS NiCrAlY displayed very good resistance to Type II hot corrosion; however, rapid Type II attack was observed when the alloy was prepared by the IC process. The LPPS and IC NiCoCrAlY formed more protective scales than the DC NiCoCrAlY, i.e., Type II hot corrosion resistance increased with microstructural refinement. Pre-oxidation of a cast NiCoCrAlY alloy greatly reduced the amount of Type II attack for the exposure times studied. The localized attack of the pre-oxidized specimens was found to initiate at reactive-element-rich regions in the pre-formed scale.

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Acknowledgments

The authors gratefully acknowledge the financial support for this work by the Office of Naval Research through Grant No. N00014-10-1-0661 (Dr. David A. Shifler, Technical Monitor).

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  1. M. N. Task

    Present address: Pratt and Whitney, Materials and Processes Engineering, 400 Main St., East Hartford, CT, 06108, USA

Authors and Affiliations

  1. Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, USA

    M. N. Task, B. Gleeson, F. S. Pettit & G. H. Meier

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  1. M. N. Task
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  2. B. Gleeson
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  3. F. S. Pettit
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  4. G. H. Meier
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Correspondence to M. N. Task.

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Task, M.N., Gleeson, B., Pettit, F.S. et al. The Effect of Microstructure on the Type II Hot Corrosion of Ni-Base MCrAlY Alloys. Oxid Met 80, 125–146 (2013). https://doi.org/10.1007/s11085-013-9405-z

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  • DOI: https://doi.org/10.1007/s11085-013-9405-z

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