Elastic plastic fracture mechanics (EPFM) based single compact tension (CT) specimen has beenused to determine the J1C value for ductile crack growth behavior of austenitic Alloy 617 as afunction of temperature. Alloy 617 showed fairly constant resistance to fracture from ambienttemperature up to 500~0 C for duplicate testing satisfying EPFM criteria. The same trend has beenobserved for the evaluation of the tearing modulus (T). In addition, efforts have been made tocalculate the values of K_(1C) and crack tip opening displacement (CTOD) for this alloy. Finally, indepth analysis of fracture morphology in the loading and unloading sequences has been analyzedby scanning electron microscopy (SEM).
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