NDLI: Solidification Behavior of Fe-6.5Si Alloy Powder for AM-SLM Processing, as Assessed by Differential Scanning Calorimetry.

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Solidification Behavior of Fe-6.5Si Alloy Powder for AM-SLM Processing, as Assessed by Differential Scanning Calorimetry.

Content Provider	Europe PMC
Author	Steiner Petrovič, Darja Donik, Črtomir Paulin, Irena Godec, Matjaž Vončina, Maja Petrun, Martin
Editor	McFadden, Shaun
Copyright Year	2023
Abstract	Lab-scale investigations on the processing of small powder volumes are of special importance for applications in additive manufacturing (AM) techniques. Due to the technological importance of high-silicon electrical steel, and the increasing need for optimal near-net-shape AM processing, the aim of this study was to investigate the thermal behavior of a high-alloy Fe-Si powder for AM. An Fe-6.5wt%Si spherical powder was characterized using chemical, metallographic, and thermal analyses. Before thermal processing, the surface oxidation of the as-received powder particles was observed by metallography and confirmed by microanalysis (FE-SEM/EDS). The melting, as well as the solidification behavior of the powder, was evaluated using differential scanning calorimetry (DSC). Due to the remelting of the powder, a significant loss of silicon occurred. The morphology and microstructure analyses of the solidified Fe-6.5wt%Si revealed the formation of needle-shaped eutectics in a ferrite matrix. The presence of a high-temperature phase of silica was confirmed by the Scheil-Gulliver solidification model for the ternary model Fe-6.5wt%Si-1.0wt%O alloy. In contrast, for the binary model Fe-6.5wt%Si alloy, thermodynamic calculations predict the solidification exclusively with the precipitation of b.c.c. ferrite. The presence of high-temperature eutectics of silica in the microstructure is a significant weakness for the efficiency of the magnetization processes of soft magnetic materials from the Fe-Si alloy system.
Journal	Materials (Basel)
Volume Number	16
DOI	10.3390/ma16124229
PubMed Central reference number	PMC10302262
Issue Number	12
PubMed reference number	37374411
e-ISSN	19961944
Language	English
Publisher	Molecular Diversity Preservation International (MDPI)
Publisher Date	2023-06-07
Access Restriction	Open
Subject Keyword	Fe-6.5wt%Si powder soft magnetic alloy differential scanning calorimetry oxygen high-temperature phase microstructure eutectics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science

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