| 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 |
Elevated Temperature Tribological Behavior of Alloys 800HT and 617 for High Temperature Gas-cooled Reactor Applications |
| Author(s) |
Valentin Pauly, Carter Tesch, Joseph Kern, Malcolm Clark, David Grierson, Oyelayo Ajayi, Dileep Singh, Kumar Sridharan |
| On-Site Speaker (Planned) |
Kumar Sridharan |
| Abstract Scope |
Incoloy 800HT and Inconel 617 have been selected as candidate structural alloys for the high-temperature gas-cooled reactor (HTGR). The impurities contained in the helium coolant (e.g., H2O, CO2, CH4) can induce corrosion reactions at high temperatures, which can affect the tribological behavior of components in sliding contact. In this study, the high-temperature tribological behavior of the two alloys tested using a pin-on-disk tribometer was observed to vary considerably depending on the type of corrosion product layers on the alloys’ surfaces. The formation of a nanostructured glaze oxide layer due to the high-pressure compaction and sintering of the surface oxide reduced friction and wear. Alloy 617 showed superior wear resistance compared to that of alloy 800HT due to the formation of a Cr- and (Ni, Cr)-spinel oxide layer, rather than Fe-containing oxides. The potential for the mitigation of wear by surface treatments such as aluminization and shot peening was also explored. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |