Abstract
The dislocation substructure produced by elevated temperature fatigue crack propagation in annealed Type 316 stainless steel was surveyed by post-test transmission electron microscopy. Both un-irradiated and neutron irradiated specimens were examined. The results for the unirradiated specimens show that dislocation cell formation was limited to within approx. 1 mm of the fracture surface. The dislocation cell size within this region was found to reflect the test temperature and effective stress level. No evidence of dislocation cell formation was observed m the neutron irradiated fatigue specimens. It was concluded that dislocation cell formation, if it occurs in neutron irradiated specimens, is confined to within approx. 0.75 mm of the fracture surface.
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