In Fig. 5 the micrograph of a crossweld specimen from a welded pipe made of Alloy 617 mod ruptured after
long term creep (26,700 h at 700°C/140 MPa) is shown. Different zones of the specimen are shown: base
material, heat effected zone and weld metal. The crack appeared in the weld metal, formation of creep cavities
on grain boundaries could be observed in HAZ, near the fusion line, perpendicular to the direction of loading.