| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
2023 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-49: Deformation Mechanism Characterization for Bi-modally Distributed γ' Precipitates in Allvac 718plus Superalloy |
| Author(s) |
Geeta Kumari, Carl J Boehlert, S Sankaran, M Sundararaman |
| On-Site Speaker (Planned) |
Geeta Kumari |
| Abstract Scope |
Alloy Allvac 718Plus was developed to improve the properties of the Inconel 718, which resulted in service temperatures up to 704ºC (55ºC more than IN718). The dominant deformation mechanisms change with the change in size and distribution of the γ' precipitates. When the γ' precipitates are larger in size, dislocations tend to loop around them, whereas when the γ' precipitates are smaller, the dislocations tend to shear through them. A bimodal γ’ precipitate distribution was developed using a two-step aging treatment at 720℃ for 10h and 900℃ for 2h, which resulted in 14 nm smaller and 55 nm larger precipitates. After the heat treatment, interrupted tensile deformation experiments were conducted. Transmission electron microscopy was used to study the particle-dislocation interactions. The same set of experiments was repeated on samples having a uni-modal precipitate distribution and the results were compared. This will help develop a model involving multi-modal distribution of precipitates. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
High-Temperature Materials, Characterization, Mechanical Properties |