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Effects of surface chemistry on hot corrosion lifeBurner rig tests were conducted under the following conditions: 900 C, hourly thermal cycling, 0.5 ppm sodium as NaCl in the gas stream, and Mach 0.3 velocity. The alloys tested were Udimet 700 (U700) and Rene 80, uncoated and with RT21, Codep, or NiCoCrAlY coatings. The tests, up to 1000 hours, included specimens in the as-processed condition and after aging at 1100 C in oxidizing or inert environments for up to 600 hours. Coil-inductance changes were measured for periodic nondestructive inspection of speciments and found useful in the following course of corrosion. Typical sulfidation observed in all cases was similar to that observed in service-run turbine components. Aging at 1100 C caused severe decrease in the hot corrosion life of RT21 and Codep coatings and a significant but lesser decrease in the life of NiCoCrAlY coatings. The extent of these decreases was much greater for all three coatings on U700 than on Rene substrates. A coating hot corrosion life-predicitin model was proposed. The model requires time/temperature information for a turbine component at takeoff conditions as well as environmental contaminant information.
Document ID
19860018615
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Fryxell, R. E.
(General Electric Co. Cincinnati, OH, United States)
Leese, G. E.
(TRW, Inc. Cleveland, Ohio., United States)
Date Acquired
September 5, 2013
Publication Date
June 1, 1986
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
NASA-CR-179471
R86AEB361
NAS 1.26:179471
Accession Number
86N28087
Funding Number(s)
PROJECT: RTOP 533-04-11
CONTRACT_GRANT: NAS3-23926
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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