| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Role of Cyclic Strain Localization in Fatigue Crack Initiation and Growth |
| Author(s) |
Jaroslav Polak, Veronika Mazanova, Tomáš Babinský, Milan Heczko |
| On-Site Speaker (Planned) |
Veronika Mazanova |
| Abstract Scope |
Cyclic strain localization in crystalline materials represents the important aspect in the early evolution of the fatigue damage. Recent results on polycrystalline copper, 316L austenitic steel, Sanicro 25 superaustenitic steel and René 41 superalloy were studied. AFM and SEM with the FIB cuttings are reported to show the true evolution of the persistent slip markings (PSMs). TEM and STEM studies of the foils prepared using FIB from the surface reveal the dislocation structure of persistent slip bands (PSBs) and the relation to the PSMs on the surface. The general model of localized cyclic plastic straining within PSBs and formation of the surface relief is proposed. Substantial role is played by point defects which are continuously produced within PSBs. Migration of point defects leads to mass redistribution and formation characteristic PSMs in the form of extrusions and intrusions. Crack-like intrusions induce localized slip-unslip leading to crack initiation and stage I growth. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, |