Service Temperature Estimation of Turbine Blades Based on Microstructural Observations

[+] Author and Article Information
J. M. Aurrecoechea, W. D. Brentnall, J. R. Gast

Solar Turbines Incorporated, San Diego, CA 92138

J. Eng. Gas Turbines Power 113(2), 251-260 (Apr 01, 1991) (10 pages) doi:10.1115/1.2906556 History: Received January 14, 1990; Online April 24, 2008


Optical and electron metallographic (SEM) examination was performed on MARM-421 samples subjected to controlled furnace exposures, to quantify the microstructural changes associated with the prolonged high-temperature exposures. Gamma prime size measurements were used to generate a mathematical model, based on diffusion-controlled kinetics, designed to estimate temperatures. This computational technique was utilized to estimate exposure temperatures of turbine blades that had seen service in land-based gas turbine engines. The engines had accumulated from 1200 to more than 98,000 hours, operating under a variety of conditions. The procedure is generally applicable to commonly used gamma prime strengthened nickel-base superalloys.

Copyright © 1991 by The American Society of Mechanical Engineers
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