Evolution of the cyclic plastic response of Sanicro 25 steel cycled at ambient and elevated temperatures

Surface Relief and Internal Structure in Fatigued Stainless Sanicro 25 Steel

“…[10] The dislocation structure of the bands corresponding to the extrusions and intrusions on the surface also differs from that found previously in interior grains of fatigued Sanicro 25. [30,31] However, a more detailed study of the dislocation structures in fatigued Sanicro 25 steel [32] indicates appreciable variability of the dislocation arrangement. Both thin bands and ladder-like structures can be found [31,32] in favorably oriented grains.…”

“…[30,31] However, a more detailed study of the dislocation structures in fatigued Sanicro 25 steel [32] indicates appreciable variability of the dislocation arrangement. Both thin bands and ladder-like structures can be found [31,32] in favorably oriented grains. It is thus probable that the difference in the dislocation structure close to the surface ( Figure 4) and in interior grains [30,31] is not due to the different procedures in the preparation of the thin foil (standard electrochemical polishing vs. FIB thinning) but due to diversity of the dislocation arrangement.…”

Creep and Fatigue Interaction Behavior in Sanicro 25 Heat Resistant Austenitic Stainless Steel

“…Recently cyclic straining conducted on Sanicro 25 at 700 °C has been reported to result in pronounced cyclic hardening due to enhanced cross slip and more homogeneous cyclic deformation [7,8] assisted by nano-clusters [8]. Figure 3 a. and c., where no dwell time is applied, shows cyclic hardening.…”

“… Hardening due to rapid increase in dislocation density [7,8].  Hardening due to precipitation and nano-clusters [8].…”

“…Recently the low cycle fatigue (LCF) properties at 700 °C of Sanicro 25 have been reported [7,8]. However, the influence of dwell time in combination with LCF, the creep-fatigue interaction is not yet fully understood.…”