High-performance gradient Fe-Si alloy thin sheets fabricated by solid powder siliconizing and diffusion annealing

Chen, Jingqi; Wang, Zhao; Zheng, Xiaofeng; Lu, Rihuan; Guo, Cheng; Chen, Shoudong; Du, Jing; Yu, Chongxiu; Li, Xianghua

doi:10.1016/j.jallcom.2023.169412

Cited by 2 publications

(1 citation statement)

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“…A challenge that needs to be overcome is how to process magnetic materials and components that contain 6.5 wt% Si (11 at% Si) beyond the current technological routes [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. With growing interest in electrification based on clean-energy technologies, the demand for next-generation high-performance magnetic materials has expanded a great deal [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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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.

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