The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Study Of The Hot Corrosion Of Superalloys

Report Number: AFML TR 67-297
Author: Walters, J. J.
Corporate Author: Avco Lycoming Div Stratford CT
Laboratory: Air Force Materials Laboratory
Date of Publication: 1967-09
Pages: 159
AD Number: AD0822779

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.

Lockheed Martin Missiles & Fire Control
Download this report

(PDF, 53.71 MB, 159 pages)

Other options for obtaining this report

Via the Defense Technical Information Center (DTIC):
A record for this report, and possibly a full-image download of the report, exists at DTIC

Via National Technical Information Service:
This report may have been digitized and made freely available for public download, or made publicly available for purchase by the National Technical Information Service through their online database, the National Technical Reports Library

Indications of Public Availability
No digital image of an index entry indicating public availability is currently available
There has been no verification of an indication of public availability from an inside cover statement