| About this Abstract |
| Meeting |
Materials Science & Technology 2011
|
| Symposium
|
Fatigue and Microstructure: A Symposium on Recent Advances
|
| Presentation Title |
Effects of Microstructure in High Temperature Fatigue |
| Author(s) |
Luc REMY |
| On-Site Speaker (Planned) |
Luc REMY |
| Abstract Scope |
The influence of microstructure features is often triggered in metallic alloys exposed to high temperature fatigue, due to interaction with time dependent phenomena such as creep and oxidation. Several examples are shown mainly in superalloys, for crack initiation and early crack growth. While plain specimens are generally used for lifing, specimens with stress or strain gradient are useful to evidence microstructure effects. The solidification microstructure can be shown to have a large influence on the initiation life using wedge specimens of cast alloys submitted to thermal fatigue. Notches in low cycle fatigue can trigger the effect of interdendritic casting pores on life. The growth of short cracks can be rather sensitive to the temperature dependence of slip activity in superalloy single crystals and to coupling effects between slip and oxidation. Experimental results however often require complementary finite element analyses to get more insight in the operating mechanisms. |
| Proceedings Inclusion? |
Definite: A CD-only volume |