About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Advanced Characterization with Synchrotron, Neutron, and In Situ Laboratory-scale Techniques
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Presentation Title |
Geometric Influences on Residual Stresses in Components Manufactured by Directed Energy Deposition |
Author(s) |
Christopher D'Elia, Michael R. Hill, Nicholas A. Bachus, Michael E. Stender, Christopher W. San Marchi |
On-Site Speaker (Planned) |
Christopher D'Elia |
Abstract Scope |
An assessment of residual stresses that arise naturally in metal additive manufacturing is reported. In additive manufacturing by directed energy deposition (DED), residual stresses develop in components from repeated thermal cycles as each layer is deposited in a series of laser melting paths. Component size and geometry inform laser path planning and influence the local thermal history of material within the additively manufactured component. Rectangular components with various lengths, widths, and heights are fabricated by DED. Residual stresses, at multiple length scales, layer and component scale, are measured in the build direction and build plane using mechanical and diffraction techniques. These measurements are compared to predictions from process simulations within Sandia’s SIERRA computational mechanics code. The simulations also provide information on in-situ strain hardening, which is compared to hardness maps on multiple planes in the builds. The experimental and computational results are interpreted in the context of predicted thermal history. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |