Fatigue crack growth behaviour of several nickel-, cobalt-, and iron-base alloys at temperatures from 297 to 977K were investigated using the fracture mechanics approach. Little or no differences in crack growth rates among the alloys were found at room temperature even though yield strengths varied over a wide range. However, at elevated temperatures some differences were observed. In an effort to account for the increase in growth rate with temperature the data were normalized with the modulus of elasticity and yield stress. Specimen fracture surfaces were examined by scanning electron microscopy.
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