About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Understanding Corrosion-Related Cracking
|
| Presentation Title |
Environmentally Assisted Cracking in Ni-based Superalloys |
| Author(s) |
Gordon Tatlock |
| On-Site Speaker (Planned) |
Gordon Tatlock |
| Abstract Scope |
Ni-based superalloys have been pivotal in the development of modern aircraft engines and land-based turbines. Many of the environmentally assisted corrosion problems that remain in turbine blades can be mitigated by the application of coatings or surface treatments. However, questions still remain about the precise corrosion related cracking mechanisms; and these will be explored in this presentation.
In particular, the roles of sulphur, chlorine and other potentially deleterious species will be reviewed in alloy CMSX-4 tested primarily at moderate temperatures (550°C) and stress (~700MPa) after the application of NaCl salt to the surface of the components. The results of high-resolution electron microscopy and analysis of cracks in thin foils extracted from samples by focussed ion beam machining will be presented. |