| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
| Presentation Title |
Solidification Behavior of Martensitic Precipitation-hardenable Stainless Steels Produced via Additive Manufacturing |
| Author(s) |
Eric A. Lass |
| On-Site Speaker (Planned) |
Eric A. Lass |
| Abstract Scope |
The extreme solidification conditions found in additive manufacturing processing of metallic alloys often lead to significant compositional heterogeneity, non-equilibrium phase formation, and microstructure that look and behavior nothing like those found in their wrought counterparts. Nowhere is this more apparent than in steels, specifically martensitic precipitation-hardenable stainless steels, where small variations in the solidification conditions can lead to changes in primary solidification phase (austenite or -ferrite), a transition from columnar to equiaxed grain morphology, and wildly different solid-state transformations during the cyclic heating/cooling cycles and ultimate cooling to room temperature. This work probes the effects of laser power and scan speed on solidification behavior in laser powder-bed-produces 17-4 PH and 15-5 PH stainless steels. Small changes in composition are find to have profound changes on microstructure for a given set of parameters. Optimization of chemistry and processing parameters to produce tailored microstructures (i.e. homogeneous and fine-grained) is also explored. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Solidification, Phase Transformations |