Investigations of Microstructure and Mechanical Properties of 17-4 Ph Ss Printed by Markforged Metal X

Akessa, Adugna Deressa; Tucho, Wakshum Mekonnen; Lemu, Hirpa G.; Grønsund, Jørgen

doi:10.2139/ssrn.4086579

Cited by 1 publication

(1 citation statement)

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“…This behavior may be due to a lower internal cohesion of the material, probably caused by the internal structures and the defects generated both during the printing process and in the final sintering stage, generating structures that are not as homogeneous or consistent as those of the electrolytic materials manufactured by casting. Other authors [ 24 , 25 ] already reported defects in parts generated with ADAM technology, highlighting the lack of union between layers and adjacent filaments deposited during the printing process (and not completely resolved during the sintering stage), as well as the internal porosity and orientation effects of the layer structures. As the electrode wears out during the EDM process, these regions with lower adhesion are exposed and released more abruptly (clusters), thus increasing the electrode wear rate compared to the electrolytic copper electrode, which is a more homogeneous material.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of the Performance of Atomic Diffusion Additive Manufacturing Electrodes in Electrical Discharge Machining

2022

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Atomic Diffusion Additive Manufacturing (ADAM) is an innovative Additive Manufacturing process that allows the manufacture of complex parts in metallic material, such as copper among others, which provides new opportunities in Rapid Tooling. This work presents the development of a copper electrode manufactured with ADAM technology for Electrical Discharge Machining (EDM) and its performance compared to a conventional electrolytic copper. Density, electrical conductivity and energy-dispersive X-ray spectroscopy were performed for an initial analysis of both ADAM and electrolytic electrodes. Previously designed EDM experiments and optimizations using genetic algorithms were carried out to establish a comparative framework for both electrodes. Subsequently, the final EDM tests were carried out to evaluate the electrode wear rate, the roughness of the workpiece and the rate of material removal for both electrodes. The EDM results show that ADAM technology enables the manufacturing of functional EDM electrodes with similar material removal rates and rough workpiece finishes to conventional electrodes, but with greater electrode wear, mainly due to internal porosity, voids and other defects observed with field emission scanning electron microscopy.

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Section: Resultsmentioning

confidence: 99%