| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
Creep Resistant Cast INCONEL Alloy 740H using an Alternative Casting Technique |
| Author(s) |
Martin Detrois, Kyle A Rozman, Paul D Jablonski, Jeffrey A Hawk |
| On-Site Speaker (Planned) |
Martin Detrois |
| Abstract Scope |
Increasing performance requirements of power plant designs require the use of Ni-based superalloys to replace steels. To date, Ni-based superalloy INCONEL 740H has been shown to be appropriate for use in A-USC power plants as boiler components in a wrought product. However, using the alloy in its cast form would be significantly valuable in terms of range of component size, geometry and complexity. Previous investigations revealed short creep lives of the cast alloy. Here, an alternative casting route was developed to control the grain size, grain boundary structure and minimize chemistry variability and segregation. More than 30,000 h worth of combined creep testing has been performed to date. A better than 38% increase was obtained for this material in comparison to the creep life obtained from the best performing conventionally cast material. Furthermore, the alternate casting route resulted in the Larson-Miller plot that coincided with that of wrought alloy 740. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |