Speaker
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 miniaturisation 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 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.
In this work, homogeneity of the element distribution in the as- printed samples, which has shown to be of crucial importance for the development of good magnetic properties has been examined by EBSD measurements coupled with EDS. Different chemical compositions of the Fe-Cr-Co alloy system have been studied to show the versatility of this method. For this purpose, the alloy compositions have been chosen in a way to obtain Cobalt- rich and - lean alloys located both in the ridge region as well as farther on the Cr- rich side of the ridge in the Fe/Co- Cr quasi- binary phase diagram. For these alloys, the phase composition at different temperatures and after different heat treatments has been studied to obtain a microstructure most optimal for the magnetic properties.
With this information in mind, the influence of printing conditions and post printing heat treatments on the microstructure and magnetic properties of the alloy system has been studied by different methods like SEM/ EBSD, TEM, magnetic characterisation and dilatometry.
| Speaker Country | Austria |
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