Crack Initiation and Propagation Properties of HY 130 Steel Weldments Following Temper Embrittlement

摘要

Elastic-plastic fracture mechanics (EPFM) may be applied to engineering problems to determine material properties related to crack initiation and propagation. Specifically, these concepts have been applied to a study of the as welded and temper embrittled weldments of HY 130 steel. The property relating the energy requirement for ductile crack initiation, JIc or KIc, is seen to be similar in both instances, although previous Charpy V-notch testing results have indicated large differences in toughness. The sensitivity to embrittlement is reflected, however, by a large difference in the crack propagation property, the tearing modules, T. The data are also compared to crack initiation and crack propagation energies measured during instrumented impact tests. (Author)