Study Of The Hot Corrosion Of Superalloys

Item

Title
Study Of The Hot Corrosion Of Superalloys
Date
1967
Index Abstract
Coming Soon
Photo Quality
Complete
Report Number
AFML TR 67-297
Creator
Walters, J. J.
Corporate Author
Avco Lycoming Div Stratford CT
Laboratory
Air Force Materials Laboratory
Extent
159
Identifier
AD0822779
Distribution Classification
1
DTIC Record Exists
No
Distribution Change Authority Correspondence
USAF ltr
Distribution Change Action Date
8/30/2004
Date Modified
Scanned by request 11/28/2005 submitted by Chromalloy Gas Turbine Corporation (Aerospace Industry - Domestic)
Abstract
The effect of operating environment and alloy composition on the nature and extent of oxidation-sulfidation attack was studied with the aid of the Lycoming environmental test rig, which operates at one atmosphere pressure. Sulfidation attack was produced by burning JP-4, JP-4R, and JP-5 fuels (sulfur contents of .02, .16, and .16 weight percent respectively) while ingesting synthetic sea water at controlled rates to yield salt/air ratios of 4ppm and 8ppm. Specimens of 11 nickel base and one cobalt base alloy were subjected to cyclic temperatures, holding at peak temperatures of 1600 F or 1750 F for ten minutes per cycle. The temperature range over which sulfidation occurred and the depth of attack increased with increasing salt-to-air ratios and with time of exposure. Good resistance to attack was generally associated with higher chromium content but high chromium alone did not guarantee good resistance to attack. Microprobe and x-ray investigations indicated that chromium-rich surface oxides provide good resistance to sulfidation and that high aluminum-titanium ratios provide good oxidation resistance.
Report Availability
Full text available
Date Issued
1967-09
Provenance
Lockheed Martin Missiles & Fire Control
Type
report
Format
1 online resource
Media
AFMLTR67-297.pdf