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

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Abstract
Creep and stress-rupture properties of cast IN738LC turbine blades have been analyzed to review the suitability of the Monkman-Grant relationship as a reliable life prediction method where t r ε . s 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 t r n 1 + t r ε . s m 1 = 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.

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