Creep crack growth tests have been conducted on a plain carbon manganese steel, aluminium alloy 2519 and titanium alloy 6242 at 360, 135 and 500°C, respectively, at conditions where only limited creep deformation was observed. The results have been analysed using ASTM Standard E1457-92 which was developed for describing creep crack growth in the presence of extensive creep. It has been found that the creep fracture mechanics parameter C* defined in E 1457 can also be used to interpret the data 1 2 generated in this investigation but that it is necessary for certain restrictions imposed in the Standard to be relaxed to allow the data to be assessed.

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