| About this Abstract |
| Meeting |
10th International Symposium on Superalloy 718 and Derivatives (2023)
|
| Symposium
|
Superalloy 718 and Derivatives
|
| Presentation Title |
(LBN - P5) Phase Evolution and Tensile Deformation of IN718-René41 Graded Superalloy Fabricated by Directed Energy Deposition |
| Author(s) |
Shenyan Huang, Ke An, Chen Shen, Changjie Sun, Alex Kitt |
| On-Site Speaker (Planned) |
Shenyan Huang |
| Abstract Scope |
A compositionally graded material comprised IN718 and René41 (a medium gamma prime superalloy) was fabricated using laser blown-powder directed energy deposition (DED/LB-M). Hot gas path components that require high and low temperature capabilities at different locations may benefit from such graded superalloy, potentially eliminating the use of welded or mechanically joined components. In-situ neutron diffraction experiment coupled with heating/cooling was performed to understand phase evolution up to 1150°C in as-built specimen. A decreasing lattice spacing from IN718 to René41 was observed over the temperature range. Linear expansion and average coefficient of thermal expansion calculated from neutron data upon cooling showed consistency with model prediction. Fraction and solvus temperature of gamma prime increased with compositions approaching René41. In addition, in-situ tensile loading experiment at 650°C was performed to investigate elastic, plastic deformation behavior within the graded composition at grain and phase levels. Diffraction elastic constants and Poisson’s ratios showed small difference between as-built and heat-treated specimens and between gamma and gamma prime phases. The applied heat treatment significantly improved grain-level yield stress for IN718 rich compositions, while small improvement was observed in R41 rich compositions. These results provide insights into optimization of graded superalloy and crucial data for modeling material behavior. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |