| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in High-Temperature Oxidation and Degradation of Materials for Harsh Environments: A SMD and FMD Symposium Honoring Brian Gleeson
|
| Presentation Title |
High-Temperature Oxidation Behavior of Dissimilar Metal Weld Joins for Steam Power Applications |
| Author(s) |
Grace de Leon, Mallikarjun Karadge, Voramon Dheeradhada, Marissa Brennan, Sreekar Karnati, Tim Stotler |
| On-Site Speaker (Planned) |
Grace de Leon |
| Abstract Scope |
Boiler and heat generators commonly employ dissimilar metal welds (DMWs). DMWs are known to be more prone to fail earlier than welds between similar materials due to CTE mismatch, creep behavior differences, and welding-induced microstructural changes.
This study focuses on GTAW and RFW of ferritic and austenitic steels pipes, which exhibit accelerated oxidation near, or at the weld line when exposed to high temperatures for extended periods. This phenomenon has been associated with earlier crack initiation, leading to part lifespans shortening. Therefore, this study aims to investigate the effect of different welding techniques of dissimilar materials on oxidation behavior and the role of a thermally sprayed iron-based coatings. As part of the study, microstructural characterization of long-term isothermal and cycling oxidation will be reported. Results of this study will provide valuable insights into the factors that contribute to DMWs failures and the effectiveness of protective coatings in preventing such failures. |