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Oxidation and corrosion resistance of candidate Stirling engine heater-head-tube alloysSixteen candidate iron base Stirling engine heater head tube alloys are evaluated in a diesel fuel fired simulator materials test rig to determine their oxidation and corrosion resistance. Sheet specimens are tested at 820 C for 3500 hr in 5 hr heating cycles. Specific weight change data and an attack parameter are used to categorize the alloys into four groups; 10 alloys show excellent for good oxidation and corrosion resistance and six alloys exhibit poor or catastrophic resistance. Metallographic, X-ray, and electron microprobe analyses aid in further characterizing the oxidation and corrosion behavior of the alloys. Alloy compositions, expecially the reactive elements aluminum, titanium, and chromium, play a major role in the excellent oxidation and corrosion behavior of the alloys. The best oxidation resistance is associated with the formation of an iron nickel aluminum outer oxide scale, an intermediate oxide scale rich in chromium and titanium, and an aluminum outer oxide scale adjacent to the metallic substrate, which exhibits a zone of internal oxidation of aluminum and to some extent titanium.
Document ID
19840020893
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Stephens, J. R.
(NASA Lewis Research Center Cleveland, OH, United States)
Barrett, C. A.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
May 1, 1984
Subject Category
Metallic Materials
Report/Patent Number
E-2028
NASA-TM-83609
NAS 1.15:83609
DOE/NASA/51040-53
Accession Number
84N28962
Funding Number(s)
PROJECT: RTOP 778-35-03
CONTRACT_GRANT: DE-AI01-77CS-51040
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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