Lifetime Prediction Under Constant Load Creep Conditions for a Cast Ni-Base Superalloy

[+] Author and Article Information
R. Castillo

Product Reliability Department, Turbine and Generator Division, Westinghouse Canada Inc., Hamilton, Ontario, Canada L8N 3K2

A. K. Koul

Structures and Materials Laboratory, National Research Council, Ottawa, Ontario, Canada K1A 0R6

E. H. Toscano

Centra Ceramico—Bologna, 40138 Bologna, Italy

J. Eng. Gas Turbines Power 109(1), 99-106 (Jan 01, 1987) (8 pages) doi:10.1115/1.3240013 History: Received February 28, 1986; Online October 15, 2009


Creep and stress-rupture properties of cast IN-738LC turbine blades have been analyzed to review the suitability of the Monkman-Grant relationship as a reliable life prediction method where tr ε̇s m = C and m and C are material constants. The constants m and C in the Monkman-Grant relationship are temperature dependent and the relationship predicts lives within a factor of ±4 relative to the observed values. A modified form of this relationship is derived where (−b tr n1 + tr ) ε̇s m1 = K and b, n, m1 , and K are material constants. The modified relationship is more accurate and predicts lives within a factor of 2 relative to the observed values. The constants b, n, m, and k are independent of stress and temperature.

Copyright © 1987 by ASME
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