The widths of extended dislocations in a monocrystal of low-C 19Cr-12wt%Ni stainless steel were measured after subjecting samples to 3 different treatments. These included deformation at 523 or 673K (treatment 1), deformation at room temperature (treatment 2) or annealing at 523K after room-temperature deformation (treatment 3). Thermal cycling experiments were also carried out. The room-temperature widths of extended dislocations were smallest after treatment 2, and largest after treatment 1. During in situ thermal cycling experiments, the width decreased with increasing temperature in a reversible manner. These features were explained by assuming that the Suzuki segregation of solute atoms towards the stacking fault ribbon of an extended dislocation was significantly enhanced during deformation at high temperatures.

Y.Kaneko, K.Kaneko, A.Nohara, H.Saka: Philosophical Magazine A, 1995, 71[2], 399-407