Analysis of Fracture Toughness Data for Modified SA508 Cl2 in the Ductile-to-Brittle Transition Region
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Published:1990
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Fracture toughness testing of steels in the ductile-to-brittle transition region is complicated by a large amount of data scatter. There are many available methods of analyzing transition region toughness data with the objective of reducing the data scatter and arriving at a representative value for the lower bound toughness. Ten 1T and five 4T compact specimens of SA508 C12 pressure vessel steel given a special heat treatment were tested in the transition region, and the data were analyzed according to six of the available methods. Of three purely statistical methods, one based on a large collection of pressure vessel and rotor steel data is preferred. Of three analytical methods, one which subtracts the contributions of plasticity and crack growth from measured toughness is preferred.