| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Modified Post-processing Thermal Treatments Designed to Relieve Notch Sensitivity in SLM Inconel 718 |
| Author(s) |
Tait Mclouth, Julian Lohser, David Witkin, Glenn Bean, Rafael Zaldivar |
| On-Site Speaker (Planned) |
Tait Mclouth |
| Abstract Scope |
Most accounts of Inconel 718 processed by laser powder-bed fusion have used a range of post-build thermal treatments, but typically employ standardized solution treatment and aging schedules developed for mill products. Although the alloy was designed for high-temperature service, descriptions of resulting mechanical properties are often limited to room-temperature tensile tests. A wider range of tests, including room-temperature tensile, creep rupture and notched stress rupture at 650 C showed that quasi-static properties were similar to wrought material but slower strain rates revealed differences, and in particular high notch sensitivity. To address this sensitivity, heat treatments that target specific aspects of the SLM microstructure are proposed, including high-temperature homogenization and an intermediate heat treatment prior to aging to further enhance δ phase precipitation. Elevated temperature mechanical testing allows for comparisons between typical heat treatments used for SLM IN718 and the novel heat treatments. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |