About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
Presentation Title |
A-29: Process Modification and Alloy Design of Ni-base Superalloys |
Author(s) |
Mohammad Tashfiul A Chowdhury, John M. O'Connell, Nathaniel P. Badgett, Anthony E. Lavelle, Bhaskar S. Majumdar |
On-Site Speaker (Planned) |
Mohammad Tashfiul A Chowdhury |
Abstract Scope |
High temperature Ni-base superalloys, whose application temperatures exceed those of Inconel 718 have been challenging to fabricate defect-free using additive manufacturing (AM). These alloys contain a high volume fraction of gamma-prime phase in the gamma matrix, and also contain refractory elements for strengthening the gamma matrix. These phases/elements provide strength, but simultaneously influence segregation and solidification behavior, and residual stresses that lead to cracking. This work was focused on alloy CM247LC, which has so far resisted crack-free AM. Using CALPHAD and crack susceptibility models along with methods to reduce deleterious carbides, alloy design was carried out, and validated using single laser scans on arc melted buttons. Subsequently, the desired alloy powder was fabricated, and AM studies conducted on them. The microstructure and mechanical properties of these AM fabricated samples will be provided, along with insight on the effects of process parameters. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, High-Temperature Materials, Copper / Nickel / Cobalt |