Hot corrosion studies of four nickel-base superalloys - B-1900, NASA-TRW VIA, 713C and IN738The susceptibility to hot corrosion of four nickel-base superalloys has been studied at 900 and 1000 C in one atmosphere of slowly flowing oxygen. Hot corrosion was induced by coating the samples with known doses of Na2SO4 and oxidizing the coated samples isothermally on a sensitive microbalance. In order of decending susceptibility to hot corrosion, these alloys were ranked: B-1900, 713C, NASA-TRW VIA, IN738. This order corresponds to the order of decreasing molybdenum content of the alloys. Chemical evidence for B-1900 indicates that hot corrosion is instigated by acid fluxing of the protective Al2O3 coating by MoO3.
Document ID
19770057180
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Fryburg, G. C. (NASA Lewis Research Center Cleveland, OH, United States)
Kohl, F. J. (NASA Lewis Research Center Cleveland, OH, United States)
Stearns, C. A. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1976
Subject Category
Metallic Materials
Meeting Information
Meeting: Symposium on Properties of High Temperature Alloys with Emphasis on Environmental Effects