Microstructural characteristics and cracking behavior during fatigue in austenitic stainless steel
- Ishikawajima-Harima Heavy Industries Co., Ltd., Tokyo (Japan)
- Ishikawajima-Harima Heavy Industries Co., Ltd., Kanagawa (Japan)
Microstructural change of type 316 stainless steel during low cycle fatigue deformation was evaluated by positron annihilation (PA) lineshape analysis and transmission electron microscope (TEM) observation. The PA measurements were performed on the surface of the sample and in the bulk. The PA lineshape parameters remarkably increase up to 20 pct of the fatigue life both on the surface and in the bulk. Dislocations increase markedly up to 1 pct of the fatigue life, and subsequently tangle and then rearrange themselves in a cell structure. The chances in PA parameters and dislocation density are well correlated. Slip lines and cracks were observed in replicas taken front the sample surface during the fatigue test. Slip lines are observed even at 0.01 pct of the life, and the density and the surface roughness increase afterward. Microcracks are observed from 20 pct of the life. The crack density also increase gradually till 85 pct of the life and cracks propagate very much after 85 pct to the failure. It is concluded that for fatigue damage in austenitic stainless steels, the microstructural change is dominant in the early stage of the fatigue life followed by crack initiation and propagation in later stages.
- OSTI ID:
- 86155
- Report Number(s):
- CONF-9505104-; ISBN 0-87170-548-6; TRN: IM9534%%227
- Resource Relation:
- Conference: 13. international conference on nondestructive evaluation in the nuclear and pressure vessel industries, Kyoto (Japan), 22-25 May 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the 13. international conference on NDE in the nuclear and pressure vessel industries; Iida, Kunihiro [ed.] [Shibaura Inst. of Technology, Tokyo (Japan)]; Light, G.M [ed.] [Southwest Research Inst., San Antonio, TX (United States)]; Whittle, M.J. [ed.] [John Whittle and Associates, Cheshire (United Kingdom)]; PB: 503 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ultrasonic attenuation peak in steel and aluminum alloy during rotating bending fatigue
Fatigue and Creep-Fatigue Deformation of an Ultra-Fine Precipitate Strengthened Advanced Austenitic Alloy