Authors: Das, D. K.; Gleeson, B.; Murphy, K. S.; Ma, S.; Pollock, T. M.

Source: Materials Science and Technology, Volume 25, Number 2, February 2009 , pp. 300-308(9)

Publisher: Maney Publishing

Abstract:

Several Ru bearing experimental single crystal superalloys were coated with β-NiAl and Pt–Hf modified γ–γ′ coatings and subjected to elevated temperature exposure. The microstructure, oxidation resistance and the propensity for the formation of secondary reaction zones (SRZ) were investigated for these coatings. The presence of significant amounts of Ru in the superalloys did not prevent the cellular transformation leading to the formation of SRZ beneath the β-NiAl coating. Cyclic oxidation exposure of the β-NiAl coated alloys at 1100°C led to a significant further growth of the SRZ. In contrast, the γ–γ′ coating did not induce the undesirable cellular transformation, even after prolonged high temperature exposure. The γ–γ′ coating also provided good oxidation resistance to the superalloys. The driving forces for SRZ formation in case of the β-NiAl coating as compared to the γ–γ′ coating are discussed.

Keywords: PLATINUM ALUMINIDE COATING; RU CONTAINING SUPERALLOY; ?-NIAL COATING; SECONDARY REACTION ZONE; ???? COATING

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328408X382352

Publication date: 2009-02-01

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