About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
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Presentation Title |
Controlling the Interplay of Geometry and Microstructure in LPBF of Shell-based Architected Materials Made of 17-4 Precipitation Hardened Stainless Steel |
Author(s) |
Julia T. Pürstl, Brandon Fields, Diran Apelian, Lorenzo Valdevit |
On-Site Speaker (Planned) |
Julia T. Pürstl |
Abstract Scope |
Architected materials, or metamaterials, allow for exquisite tailoring of the mechanical response via careful topological design. A largely unexplored opportunity lies in the design of functionally graded metamaterials, where spatial variations in properties are achieved by either a non-periodic topology or by introducing local variations in the constituent material properties.
Local microstructural control was recently demonstrated in a 17-4 PH stainless steel processed via laser powder bed fusion (LPBF), whereby modulations of the processing parameters introduce significant variations in the martensite to ferrite ratio, at a scale of ~150 microns. Through finite element analysis, microstructural characterization and indentation mapping, this study investigates the influence of these local microstructural variations on the compressive response of gyroid metamaterials. The resulting metamaterial is architected at 3 length scales: unit cell size, shell thickness, and the microstructural voxel. We exploit property variations at these three scales to maximize toughness and energy absorption.
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Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Iron and Steel, Mechanical Properties |