Abstract
The present paper deals, at length, with a number of aspects of the novel usage of miniature disc specimens to ascertain the loss of toughness in certain critical engineering components which operate at elevated temperatures. This type of test is commonly known as the small punch, SP, test. Details of the experimental methodology are introduced together with a critical appraisal of the relationship between SP transition temperature, T SP, and the more conventional Charpy fracture appearance transition temperature, FATT, obtained from large test specimens. Essentially it was demonstrated that a non-linear expression better described the T SP–FATT trends published in the literature, viz. FATT=C/ T SP 2 When the T SP–FATT trends of the various steel classes were concerned separately an encouraging picture emerged in that a reasonable amount of the reported data exhibited good agreement with the predicted effects of grain size. Finally, the fractographic characteristics of the SP test and the Charpy test were compared and contrasted.
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