| Abstract Scope |
High silicon steel Fe-6.5Si (wt.%) is considered a candidate for high-speed motors and high-frequency transformers. With a high saturation of 1.8T, Fe-6.5Si has higher resistivity (82 µΩ cm) than traditional 3.2% silicon steel (52 µΩ cm), leading to significantly lower eddy current loss when used at high frequencies (>=400 Hz). However, increased silicon content also makes Fe-6.5%Si too brittle to be processed using the conventional process such as cold rolling. Rapid solidification by melt spinning is a viable route for ductile Fe-6.5%Si manufacturing. In this talk, we will discuss the alloying additions to improve the magnetic properties and processability of high silicon steel. Elements such as B, Co, Ce, and V have been investigated, and their effect on melt pool stability, wetting behavior, magnetic saturation, hysteresis loss, eddy current loss, electrical resistivity, and ductility will be discussed. Funded by USDOE-EERE-VTO-EDT through Ames Lab (contract no. DE-AC02-07CH11358). |