About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Functional and Structural Thin Films and Coatings & Honorary Palkowski Session
|
Presentation Title |
Oxidation-induced Cracking in Dissimilar Metal Weld Joins for Steam Boiler Applications |
Author(s) |
Marissa Brennan, Voramon Dheeradhada, Shenyan Huang, Patrick Brennan, Enes Sales, Marija Drobjnak |
On-Site Speaker (Planned) |
Marissa Brennan |
Abstract Scope |
Dissimilar metal welds such as those used in boiler or heat recovery steam generators (HRSG) have exhibited oxidation-induced cracking after long-term exposure at elevated temperatures. Oxidation-induced cracking, also termed oxide notching, occurs at or near the weld interface due to differences in oxidation behaviors at the joint which is exacerbated by local stress. Immature cracking can degrade the power plant operation requiring expensive repair. Thermally sprayed iron-based coatings acted as an oxidation resistance coating providing a barrier to slow the internal attack of oxidizing species. Coating microstructure, chemical analyses, and tensile adhesion data informed the feasibility of this as a preventative solution to oxide notching in the field. Furthermore, the evolution of phase stability over the service lifecycle was evaluated in order to identify anticipated diffusing species across the ferritic/austenitic weld boundaries.
Acknowledgement: This material is based upon work supported by the Department of Energy under Award Number(s) DE-FE0031907. |
Proceedings Inclusion? |
Planned: |
Keywords |
Surface Modification and Coatings, Joining, Environmental Effects |