| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Temperature Creep Properties of Advanced Structural Materials
|
| Presentation Title |
Creep Ratcheting of a HP+NbW (MA) Steam Methane Reformer Tube Alloy |
| Author(s) |
Mackenzie Caughey, Milo V. Kral |
| On-Site Speaker (Planned) |
Mackenzie Caughey |
| Abstract Scope |
Centrifugally cast austenitic steels such as ASTM HP+NbW (MA) are commonly used as steam-methane reformer tubes, operating at relatively low stress (15-40 MPa) and high temperature (> 0.5 TM). Traditional creep life assessment techniques based on inverse design approaches (e.g. Larson-Miller) have failed to accurately predict the life under cyclic thermal loading. Monotonic creep tests and cyclic creep ("creep ratcheting") experiments have been completed to provide strain rate data. Interrupted tests and post-mortem microstructural analysis will provide void fraction, size and spatial distribution data at varying stages. A modified Gurson-Tvergaard-Needleman-type model will utilize the strain rate and microstructural data to compare remaining life under cyclic conditions with monotonic conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, |