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• W2892707598 abstract "Electron beam melting EBM is emerging as a promising manufacturing process where metallic components are manufactured from three dimensional D computer aided design models by melting layers onto layers There are several advantages with this manufacturing process such as near net shaping reduced lead times and the possibility to decrease weight by topology optimization aspects that are of interest for the aerospace industry In this work two alloys Ti Al V and Alloy widely used within the aerospace industry were investigated with X ray microtomography XMT to characterize defects such as lack of fusion LOF and inclusions It was furthermore possible to view the macrostructure with XMT which was compared to macrostructure images obtained by light optical microscopy LOM XMT proved to be a useful tool for defect characterization and both LOF and un melted powder could be found in the two investigated samples In the EBM built Ti Al V sample high density inclusions believed to be composed of tungsten were found One of the high density inclusions was found to be hollow which indicate that the inclusion stems from the powder manufacturing process and not related with the EBM process By performing defect analyses with the XMT software it was also possible to quantify the amount of LOF and un melted powder in vol From the XMT data meshes were produced so that finite element method FEM simulations could be performed From these FEM simulations the significant impact of defects on the material properties was evident as the defects led to high stress concentrations It could moreover with FEM be shown that the as built surface roughness of EBM material is of importance as high surface roughness led to increased stress concentrations" @default.
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• W2892707598 date "2018-05-18" @default.
• W2892707598 modified "2023-09-27" @default.
• W2892707598 title "Defect characterization of electron beam melted Ti-6Al-4V and Alloy 718 with X-ray microtomography" @default.
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• W2892707598 doi "https://doi.org/10.15406/aaoaj.2018.02.00044" @default.
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