About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
E-8: Solidification and Crack Defect Formation on the Single Melt-track Scale for High γ' CoNi-base Superalloy Variants |
Author(s) |
Evan B. Raeker, Kira M Pusch, Kaitlyn M Mullin, James Lamb, Ning Zhou, Stephane Forsik, Austin Dicus, Michael M Kirka, Tresa M Pollock |
On-Site Speaker (Planned) |
Evan B. Raeker |
Abstract Scope |
Additive manufacturing enables the fabrication of complex part geometries, and is attractive for advanced aerospace components. Laser powder-bed fusion (LPBF), specifically, is being assessed for manufacturing structural components of gas turbine engines made from high-γ' volume fraction superalloys. However, the formation of crack defects during LPBF of nearly all superalloys within this class has undercut their mechanical performance greatly. This study builds on prior work examining the cracking susceptibility of high-γ' volume fraction superalloys during LPBF by simplifying the LPBF process down to single-track laser melting scans. The CoNi-base alloy GammaPrint-700 is utilized in this study, as the cracking resistance of the alloy can be controlled through the boron content. A means of improving the cracking resistance of the alloy through homogenization treatments prior to laser melting was identified. Characterization of the single-tracks reveals a possible mechanism of crack initiation via liquation cracking of grain boundaries in the substrate material, and propagation via solidification cracking along grain boundaries in the melt pool. Additionally, a protocol for assessing the cracking-resistance while developing new high-γ'volume fractionsuperalloys for additive manufacturing is discussed. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |