About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Materials Design and Processing Optimization for Advanced Manufacturing: From Fundamentals to Application
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Presentation Title |
Solidification Behavior of Additively Manufactured Martensitic Precipitation-hardenable Stainless Steels |
Author(s) |
Melanie Buziak, Eric A. Lass |
On-Site Speaker (Planned) |
Melanie Buziak |
Abstract Scope |
The solidification conditions found during additive manufacturing (AM) of metallic alloys leads to compositional heterogeneity, non-equilibrium phase formation, and disparate microstructure that produces material properties unlike those of their wrought counterparts. This is particularly apparent in martensitic precipitation-hardenable stainless steels (PH-SS), where small variations in solidification conditions leads to changes in primary solidification phase (austenite or δ-ferrite), a transition from columnar to equiaxed grain morphology, and different solid-state transformations caused by the variable material composition and cyclic heating/cooling cycles of AM. This work aims to understand the mechanisms of the solidification behavior of laser-powder-bed-fusion (L-PBF) PH-SS through the investigation of powder feedstock chemistry and manipulation of processing parameters. Laser energy density and normalized enthalpy have been found to have an effect on the as-built microstructure and properties. The role of processing parameters on the solidification behavior is explored to gain greater control of the processing-structure-properties relationship of martensitic PH-SS. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Iron and Steel |