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Effects of MAR-M247 substrate (modified) composition on coating oxidation coating/substrate interdiffusionThe effects of gamma+gamma' Mar-M247 substrate composition on gamma+beta Ni-Cr-Al-Zr coating oxidation and coating/substrate interdiffusion were evaluated. These results were also compared to a prior study for a Ni-Cr-Al-Zr coated gamma Ni-Cr-Al substrate with equivalent Al and Cr atomic percentages. Cyclic oxidation behavior at 1130 C was investigated using change in weight curves. Concentration/distance profiles were measured for Al, Cr, Co, W, and Ta. The surface oxides were examined by X-ray diffraction and scanning electron microscopy. The results indicate that variations of Ta and C concentrations in the substrate do not affect oxidation resistance, while additions of grain boundary strengthening elements (Zr, Hf, B) increase oxidation resistance. In addition, the results indicate that oxidation phenomena in gamma+beta/gamma+gamma' Mar-M247 systems have similar characteristics to the l gamma+beta/gamma Ni-Cr-Al system.
Document ID
19850010763
Acquisition Source
Legacy CDMS
Document Type
Thesis/Dissertation
Authors
Pilsner, B. H. (Michigan Technological Univ. Houghton, MI, United States)
Date Acquired
September 5, 2013
Publication Date
February 1, 1985
Subject Category
Metallic Materials
Report/Patent Number
NASA-CR-174851
NAS 1.26:174851
Accession Number
85N19073
Funding Number(s)
CONTRACT_GRANT: NAG3-216
PROJECT: RTOP 505-33-62
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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