Environmental Effects on the High-Temperature Corrosion of Superalloys in Present and Future Gas Turbines

[+] Author and Article Information
S. Y. Lee, W. E. Young

R & D Center, Westinghouse Research Laboratories, Pittsburgh, Pa.

C. E. Hussey

Westinghouse Gas Turbine Division, Westinghouse Electric Corporation, Lester, Pa.

J. Eng. Power 94(2), 149-153 (Apr 01, 1972) (5 pages) doi:10.1115/1.3445652 History: Received August 03, 1971; Online July 14, 2010


Effects of temperature and contaminant levels on the high-temperature corrosion of superalloys used in gas turbines were investigated using pressurized passages which simulate the operating conditions of present-day gas turbines. The alloys were tested in a cooled configuration realistically simulating the air-cooled vanes and blades of a gas turbine. Conclusions are drawn as to the permissible level of contaminants and the effect of metal cooling on high-temperature corrosion. It is shown that the surface temperature of a blade or vane rather than the gas-stream temperature is the critical factor in determining the amount of attack to be expected at a given contaminant level and the amount of attack is an exponential function of this temperature. Furthermore, in a dynamic-type test no decrease in corrosion rate is noted at higher temperatures. It was concluded that the use of a 5 ppm Na/2 ppm V fuel would result in an excessive amount of attack with a metal surface temperature of 1500 deg F.

Copyright © 1972 by ASME
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