About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing of Metals: Applications of Solidification Fundamentals
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Presentation Title |
Solidification Modes during Additive Manufacturing Thermal Conditions Revealed by High-speed X-ray Diffraction |
Author(s) |
Hans-Henrik Konig, Niklas Holländer Pettersson, A Durga, Steven Van Petegem, Daniel Grolimund, Andrew Chihpin Chuang, Qilin Guo, Lianyi Chen, Christos Oikonomou, Fan Zhang, Greta Lindwall |
On-Site Speaker (Planned) |
Hans-Henrik Konig |
Abstract Scope |
Laser-Powder Bed Fusion (L-PBF) enables manufacturing of complex tool geometries with improved tool performance. During L-PBF high thermal gradients and high solidification velocities occur and determine the solidification mode. To study the impact of the thermal gradients and solidification velocities on the solidification mode in a hot-work tool steel, we used two synchrotron-based, high-speed X-ray diffraction setups. Primary δ-ferrite is observed at a cooling rate of 2.12 × 104 K/s, and at a higher cooling rate of 1.5 × 106 K/s, δ-ferrite is suppressed, and primary austenite is observed. The thermal conditions during the experiments are linked to a solidification model, that is based on the dendrite growth model by Kurz-Giovanola-Trivedi (KGT). The modelling results predict the experimental observations. This work shows how in-situ XRD measurements can be applied to understand the microstructure evolution and to validate computational thermodynamics and kinetics models, facilitating alloy and parameter development for AM processes. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, ICME |