Abstract
Delayed crack initiation and propagation behavior from a notch of poor penetration in a weldment of HT80 steel of 31 mm thickness has been investigated, to apply a fracture mechanical technique to a evaluation of the susceptibility to delayed cracking. Three points bend specimen of 70 mm width with weld defect of poor penetration were welded, and the tip of the notch was located on a fusion line in modified-Vee joints. Crack opening displacement and Acoustic Emission signals given off have been recorded as a function of time. Results can be summarized as follows:(1) Fracture mode of the presure vessel at proof loading, that is the transition behavior from delayed cracking to unstable cleavage fracture, can be easily reappeared by the laboratory test proposed in this report.(2) The susceptibility to delayed cracking of the weldment of HT80 steel can be successfully evaluated as a function of stress intensity factor or COD.(3) Specimen actively emits Acoustic Emission accompanying delayed crack growth.
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