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Instruments / Technical Area	Publication Details	Published	Actions
I12-JEEP: Joint Engineering, Environmental and Processing	In situ X-ray quantification of melt pool behaviour during directed energy deposition additive manufacturing of stainless steel Yunhui Chen , Samuel J. Clark , Yuze Huang , Lorna Sinclair , Chu Lun Alex Leung , Sebastian Marussi , Thomas Connolley , Oxana V. Magdysyuk , Robert C. Atwood , Gavin J. Baxter , Martyn A. Jones , Iain Todd , Peter D. Lee Materials Letters DOI: 10.1016/j.matlet.2020.129205 Diamond Proposal Number(s): [20096] Open Access Show Abstract ▼ Abstract: The Directed Energy Deposition Additive Manufacturing (DED-AM) of SS316L was studied using in situ and operando synchrotron X-ray imaging to quantitively understand the effect of processing parameters on the melt-pool morphology and surface quality. It was found that surface roughness of DED-AM builds can result from melt pool surface perturbations caused by changes in the melt flow and build stage motion perturbations. Process maps are developed that quantitatively correlate build quality to process parameters including powder feed rate, laser power and traverse speed. How the AM process parameters control build efficacy is clarified, and the processing conditions required to dampen surface perturbations leading to roughness were determined.	Dec 2020
I12-JEEP: Joint Engineering, Environmental and Processing	Melt pool morphology in directed energy deposition additive manufacturing process Y. Chen , S. Clark , A. C. L. Leung , L. Sinclair , S. Marussi , R. Atwood , T. Connolley , M. Jones , G. Baxter , Peter Lee Iop Conference Series: Materials Science And Engineering 861 MCWASP XV 2020 DOI: 10.1088/1757-899X/861/1/012012 Diamond Proposal Number(s): [20096] Open Access Show Abstract ▼ Abstract: Directed Energy Deposition Additive Manufacturing (DED-AM) is one of the principal AM techniques being explored for both the repair of high value components in the aerospace industry as well as freeform fabrication of large metallic components. However, the lack of fundamental understanding of the underlying process-structure-property relationships hinders the utilisation of DED-AM for the production or repair of safety-critical components. This study uses in situ and operando synchrotron X-ray imaging to provide an improved fundamental understanding of laser-matter interactions and their influence on the melt pool geometry. Coupled with process modelling, these unique observations illustrate how process parameters can influence the DED-AM melt pool geometry. The calibrated simulation can be used for guidance in an industrial additive manufacturing process for microstructure and quality control.	May 2020

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