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Description
In recent years, the method of additive manufacturing has become more and more important in the production of magnetic materials due to higher demands for miniaturization and complex- shaped magnet parts. With the method of Laser beam- powder bed fusion (LB-PBF), an in- situ alloying process for the additive manufacturing of the Fe-Cr-Co system has been developed. With this novel method that has been extensively studied in this work, the production of complex alloys with a composition accustomed to each specific case of application can be achieved directly in the printing chamber by the use of elemental powders or simpler commercial alloy powders as base materials.
First, the influence of different printing parameter on the homogeneity of the element distribution in the as- printed samples has been examined by EBSD measurements coupled with EDS. The homogeneity of element distribution in in- situ alloyed samples is not only of crucial importance for the magnetic properties in this material, but also for materials properties of in- situ alloyed materials in general. Obtaining a homogeneous distribution of elements during the in- situ alloying process without the need for a subsequent heat treatment for homogenization can be of economic benefit for the producer. Therefore, the effectiveness of different methods to increase the homogeneity from parameter variation and variation of particle size distribution has been examined.
With this information in mind, the influence of printing conditions and the elemental homogeneity on the microstructure and magnetic properties of the alloy system has been studied by different methods like SEM/ EBSD, TEM, magnetic characterization and dilatometry.