About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
Microstructure and mechanical properties of additively manufactured Haynes 230: a comparative study of L-PBF vs. LP-DED |
Author(s) |
Muztahid Muhammad, Rukesh Gusain, Reza Ghiaasiaan, Paul R. Gradl, Shuai Shao, Nima Shamsaei |
On-Site Speaker (Planned) |
Muztahid Muhammad |
Abstract Scope |
This study investigates the microstructure and room temperature mechanical properties of Haynes 230 fabricated via laser powder bed fusion (L-PBF) and laser powder directed energy deposition (LP-DED). The same multiple-step heat treatments (HT); stress-relieving (1066°C for 1.5 hours), followed by hot isostatic pressing (HIP at 1163°C and 103 MPa for 3 hours), and solution annealing (1177°C for 3 hours), are applied to both L-PBF and LP-DED specimens. Microstructural analysis is conducted employing a scanning electron microscope. Uniaxial tensile tests at room temperature are conducted to evaluate the mechanical properties. The microstructures after HT and tensile results for both L-PBF and LP-DED specimens are found to be comparable. Upon post-processing HTs, the micro-segregation and dendritic microstructure observed in non-heat-treated conditions are fully dissolved, and carbide phases (M6C/M23C6) are formed within both grain interiors and grain boundaries. Finally, the failure mechanisms under tensile load are studied and compared by fractography. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |