| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
2024 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-35: Effects of Liquid Nitrogen Cryogenic Cooling on Nickel Aluminum Bronze Weld Metal Microstructure Manufactured with Directed Energy Deposition Process |
| Author(s) |
Alexey Kuprienko, Sriram Vijayan, Ashton Egan, Carolin Fink |
| On-Site Speaker (Planned) |
Alexey Kuprienko |
| Abstract Scope |
Conventional casting processes of large nickel aluminum bronze (NAB) components used in naval applications lead to inhomogeneous microstructures, high residual stresses and long lead times. Directed energy deposition (DED) is an alternative processing route for manufacturing of large components for the shipbuilding industry. In-situ liquid nitrogen cryogenic cooling technology was implemented to address two key challenges in DED of large deposits: low productivity and microstructure control. Effect of LN2 cooling on microstructure of NAB DED builds was evaluated. Changes to the alpha grain size were observed via light optical microscopy as a function of cryogenic cooling. Transmission electron microscope techniques including energy dispersive spectroscopy were used to identify several types of kappa precipitates. Their size and distribution varied in cryogenic cooled NAB DED as compared to reference builds. The observed microstructural changes with cryogenic cooling resulted in a decrease in microhardness. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Additive Manufacturing, Other, Other |