| 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 |
Is the Carbon Content Really an Issue for the LCF Durability of Forged γ/γ′ Ni-based Disk Alloys? |
| Author(s) |
Adele Govaere, Anne-Laure Rouffié, Florence Hamon, Patrick Villechaise, Jean-Michel Franchet, Alexandre Devaux, Coraline Crozet, Paraskevas Kontis, Jonathan Cormier |
| On-Site Speaker (Planned) |
Adele Govaere |
| Abstract Scope |
The nickel-based superalloy AD730TM is considered for turbine disks application. To understand the role of non-metallic inclusions, a carbon-doped version of the material was studied. Thus, the impact of the inclusions chemical compositions, density and size distribution on the low cycle fatigue and tensile properties was investigated. The nature of the particles was obtained by EDS and APT analysis. Their sensitivity to oxidation was examined. Strain-controlled LCF tests were carried out in air at intermediate and high temperature to characterize the cyclic behavior and identify the crack initiation sites for both materials. In order to investigate the influence of the environment, tests were performed on pre-oxidized specimens in vacuum. The results showed that the size of the inclusions appears to be an important parameter in terms of LCF durability, rather than their density. And the cracking due to oxidation of the particles is strongly influenced by their chemical composition. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |