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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Additive Manufacturing of Functional, Energy, and Magnetic Materials
Presentation Title Toward Understanding the Effect of Selective Laser Re-melting on the Mechanical Properties of the SLM Fabricated Nitinol
Author(s) Parisa Bayati, Keyvan Safaei, Mohammadreza Nematollahi, Ahmadreza Jahadakbar, Mohammad Mahtabi, Mohammad Elahinia
On-Site Speaker (Planned) Parisa Bayati
Abstract Scope Although additive manufactured (AM) Nitinol parts exhibits acceptable shape memory and superelasticity in compression loadings, they provide a relatively weak tensile and fatigue properties in comparison to the conventionally manufactured Nitinol. As a solution to improve the mechanical properties of the AM fabricated Nitinol and to reduce the internal microvoids, we have investigated the effect of re-melting during the SLM procedure after fabricating each layer. A series of re-melting process parameters including different scanning speed and laser powers were studied through mechanical testing, DSC, and SEM analysis. We have shown that proper selection of the re-melting process parameters improves the powder bed quality of each layer, increases the density of the fabricated parts by up to %1.5, and reduces the top surface roughness by up to %50. Improving the density and reducing the internal voids may improve the mechanical properties, and it is also being investigated in this work.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, Characterization, Mechanical Properties


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Selective Laser Melting of Defect-free NiTi SMA Parts Using a Process Optimization Framework
Toward Understanding the Effect of Selective Laser Re-melting on the Mechanical Properties of the SLM Fabricated Nitinol

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