Speaker
Description
The development and utilization of metal powder for additive manufacturing processes requires deep comprehension about the complete process chain including atomization, processing and recycling of powder material. Using laser powder-bed fusion, a huge amount of the powder feedstock is left after the process. To increase the efficiency of such processes, it is essential to reuse excess material. Therefore it is from high importance to obtain information about the influence of powder recycling.
In this work, the influence of recycling on properties of AISI 904L powder and on printed parts was investigated. The chemical composition as well as morphology and flowability of virgin and recycled powder was analysed. Furthermore printed parts from virgin and recycled powder were investigated. Besides cubic samples for determining porosity and microstructure also samples for tensile tests and notched bar impact test were produced. To obtain best results, the process parameters were initially adjusted in an optimal range to build parts with relative density higher than 99 %.
Particle size distribution and morphology were determined by optical and scanning electron microscopy. The chemical composition of both powder and built samples was analysed with energy-dispersive X-ray spectroscopy and inert gas fusion for carbon, sulphur, nitrogen and oxygen. Flowability of the different powder grades was measured with Revolution Powder Analyser. The microstructure of parts including porosity and grain size was analysed using optical microscope as well as a scanning electron microscope with electron backscatter diffraction.
| Speaker Country | Germany |
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