About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing and Alloy Design: Bridging Fundamental Physical Metallurgy, Advanced Characterization Techniques, and Integrated Computational Materials Engineering for Advanced Materials
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Presentation Title |
Operando temperature and phase mapping with polarization contrast neutron imaging during laser powder bed fusion of multi-materials |
Author(s) |
Shieren Sumarli, Florencia Malamud, Steven Van Petegem, Steve Gaudez, Antonios Baganis, Matteo Busi, Efthymios Polatidis, Christian Leinenbach, Roland Logé, Markus Strobl |
On-Site Speaker (Planned) |
Shieren Sumarli |
Abstract Scope |
The presence of a ferromagnetic BCC phase in the as-built microstructure of bimetallic stainless steel and Cu alloy, which strengthens the composite, has been commonly observed. However, the volume fraction, spatial distribution, and driving force of the phase transformation have not been investigated. This study utilized polarization contrast neutron imaging technique while manufacturing centimeter-sized specimens of different premixture compositions of 316L and CuCrZr powders using a custom-designed laser powder bed fusion system. These full-field spatially resolved measurements resulted in the quantification of temperature and ferromagnetic phase evolution throughout the volume and the process. It is shown that the ferromagnetic phase fraction and distribution depend particularly on the inter-influence of local chemical composition and thermal history, involving different cooling rates and intrinsic heat treatment throughout the specimens. Ex situ post-built tomography, microstructural analyses (EBSD and EDX), magnetization tests, and thermodynamic calculations further confirmed the findings. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Phase Transformations, Other |