About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
Solving Solidification Cracking in Laser Powder Bed Fusion Haynes 230 |
Author(s) |
Jonah Klemm-Toole, Ruben Ochoa, Benjamin Rafferty, Amy Clarke, Jeremy Iten |
On-Site Speaker (Planned) |
Jonah Klemm-Toole |
Abstract Scope |
Haynes 230 is a wrought solid solution strengthened Ni-based alloy that exhibits excellent high temperature strength, oxidation resistance, and weldability with traditional arc welding processes. However, when processed with laser powder bed fusion (LPBF) additive manufacturing (AM), significant solidification cracking is observed. In this presentation, we show how we have eliminated solidification cracking in LPBF Haynes 230 by controlling nucleation and promoting equiaxed dendritic solidification. The crack-free microstructures we produce exhibit excellent strengths and ductilities at elevated temperature, enabling the addition of Haynes 230 to the library of materials processible with LPBF. We discuss our approach in the context of solidification models that predict why Haynes 230 exhibits solidification cracking in LPBF, but not in arc welding, as well as why other Ni-based alloys such as IN718 and Haynes 282 do not exhibit cracking in LPBF. |