About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
|
Presentation Title |
On the Path to Understanding Stress Corrosion Crack Initiation of Austenitic Alloys in High Temperature Water |
Author(s) |
Gary S. Was, Drew Johnson, Wejun Kuang, Diana Farkas, Ian Robertson |
On-Site Speaker (Planned) |
Gary S. Was |
Abstract Scope |
The similarity of factors responsible for crack initiation in nickel base alloys and irradiated stainless steels suggests a common mechanism. While a general understanding of the process is emerging, there are several interesting observations that have yet to be incorporated into a complete description of the mechanism. It is now known that the local stress at sites of dislocation channel impingement at grain boundaries in irradiated stainless steel plays a critical role. In nickel-base alloys, preferential internal oxidation plays a key role. In both systems, diffusion induced grain boundary migration, the protective nature of the surface oxide over the grain boundary, and the alloy chromium content appear to be key factors affecting crack initiation., with second phases near grain boundaries and minor elements playing minor roles. This talk will focus on identification and discussion of these processes involved in crack initiation in high temperature water and a possible unifying mechanism. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Other, Other |