Creep rupture, in the form of cavities and reheat cracks at the prior austenite grain boundaries, has been examined in the heat-affected zone and weld metal of a CrMoV steel weldment. The surfaces of the cavities and cracks were observed by electron fractography using carbon extraction replicas. The cavities appeared to be polyhedral and were associated with particles of V4C3, 200–600 Å in dia. It is possible that the cavities were nucleated heterogeneously at the particles. There was no evidence of cavity nucleation at the usual nonmetallic inclusions. The surfaces of cavities and cracks were thermally faceted. The faceting of the crack surfaces had undulations corresponding to the size of the prior cavities.
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