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Record 4 of 233
Oxidation of low cobalt alloys
Author and Affiliation:
Barrett, C. A.(NASA Lewis Research Center, Cleveland, OH, United States)
Abstract: Four high temperature alloys: U-700, Mar M-247, Waspaloy and PM/HIP U-700 were modified with various cobalt levels ranging from 0 percent to their nominal commercial levels. The alloys were then tested in cyclic oxidation in static air at temperatures ranging from 1000 to 1150 C at times from 500 to 100 1 hour cycles. Specific weight change with time and X-ray diffraction analyses of the oxidized samples were used to evaluate the alloys. The alloys tend to be either Al2O3/aluminate spinel or Cr2O3/chromite spinel formers depending on the Cr/Al ratio in the alloy. Waspaloy with a ratio of 15:1 is a strong Cr2O3 former while this U-700 with a ratio of 3.33:1 tends to form mostly Cr2O3 while Mar M-247 with a ratio of 1.53:1 is a strong Al2O3 former. The best cyclic oxidation resistance is associated with the Al2O3 formers. The cobalt levels appear to have little effect on the oxidation resistance of the Al2O3/aluminate spinel formers while any tendency to form Cr2O3 is accelerated with increased cobalt levels and leads to increased oxidation attack.
Publication Date: Oct 01, 1982
Document ID:
19830003021
(Acquired Nov 13, 1995)
Accession Number: 83N11291
Subject Category: METALLIC MATERIALS
Document Type: Conference Paper
Publication Information: COSAM (Conserv. Of Strategic Aerospace Mater.) Program Overview; p 89-94; (SEE 19830003012)
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: NASA Lewis Research Center; Cleveland, OH, United States
Description: 6p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ALUMINUM OXIDES; CHROMIUM OXIDES; COBALT ALLOYS; OXIDATION; SPINEL; OXIDATION RESISTANCE; TEMPERATURE GRADIENTS; WEIGHT REDUCTION; X RAY DIFFRACTION
Imprint And Other Notes: In its COSAM (Conserv. Of Strategic Aerospace Mater.) Program Overview p 89-94 (SEE N83-11282 02-26)
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