The elementary mechanisms of deformation under fatigue stresses were analysed, for a stainless steel bicrystals, by means of transmission electron microscopy. Attention was paid to the interaction between lattice dislocations and a ferrite/austenite interface whose orientation was very close to the Kurdjumov-Sachs relationship. The results depended upon whether the notch was located in the α phase or in the γ phase. Only for bicrystals which were notched in the α-phase was transmission of dislocations, across the interface and into the γ-phase observed.

Interaction of Lattice Dislocations with the α-γ Interphase Interface in a Stainless Steel Bicrystals. A.Taisne, B.D.Ecamps, L.Priester: Philosophical Magazine A, 2002, 82[15], 2791-804