Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-853-C8-856
Effects of In-Situ Proton-Irradiation and Thermal-Pulse on the High-Cycle Fatigue Properties of Low Carbon 316 Stainless SteelsH. Mizubayashi1, K. Tateishi1, H. Tanimoto1 and K. Nakata2
1 Institute of Materials Science, University of Tsukuba, Tsukuba 305, Japan
2 Hitachi Research Laboratory, Hitachi Ltd., Hitachi 317, Japan
For the modifîed 316L stainless steel in which the dislocation interaction governs the fatigue hardening process, the high-cycle fatigue tests were carried out between 300 and 403 K. The in situ irradiation tests and the in situ thermal-pulse tests indicate that dislocation rearrangements due to thermal-pulse give rise to an increase in the areal density of persistent slip bands (PSBs), resulting in elongation of the fatigue life Nf, and an introduction of obstacles to dislocation motions, irradiation induced lattice defects or the fatigue induced precipitates, brings about a decrease in the areal density of PSBs, giving shortening of Nf.
© EDP Sciences 1996