Fe-3 Mass Research Articles

Sn Segregation at Grain Boundary and Interface between MnS and Matrix in Fe-3 mass%Si Alloys Doped with Tin

Grain boundary segregation in Fe-3 mass%Si alloys doped with tin was investigated by Auger electron spectroscopy (AES), in order to shed light on a fact that tin addition modifies secondary recrystallization of Si steels. It was found that in decarburized specimens tin was segregated at grain boundaries and its segregated amount increased with the bulk tin content. The effective grain boundary segregation energy of tin was estimated from the results, and the kinetics of the grain boundary segregation of tin was discussed. As related to a phenomenon that the size of precipitates (inhibitors) in silicon steels becomes smaller by tin addition, interfaces between precipitates and matrix were also examined with AES

Surface Segregation of Chromium in Fe-20 mass%Cr Single Crystal Accompanied with Trace of Nitrogen

Surface Segregation of Chromium in Fe-20 mass%Cr Single Crystal Accompanied with Trace of Nitrogen

Fe-3 mass%Si焼結合金の磁気的性質と組織

The relationship between magnetic properties and structure of Fe-3 mass%Si alloy sintered at various temperatures has been studied. Electrolytic iron powder and Fe-17 mass%Si master-alloy powder were used as the material powder. The compacted Fe-3 mass%Si specimens were sintered over the temperature range between 1173 and 1673 K. Magnetic hysteresis loop, induction at 800 AT/m (B8), maximum permeability (μm) and coercive force (Hc) were measured using a recording fluxmeter, and core loss (W5⁄50) was measured at frequency of 50 Hz and maximum induction of 0.5 T. Structure was examined using an electron probe microanalyzer.The results are summarized as follows:(1) The sintered alloy shows a hysteresis loop suitable for block-shape magnetic cores at the sintering temperature range between 1473 and 1673 K. At this temperature range, B8 increases from 1.22 T to 1.41 T and μm increases from 9×10−3 H/m to 1.5×10−2 H/m linearly with the density of the sintered alloy. On the other hand, Hc decreases from 84 AT/m to 48 AT/m linearly with the density. In this case, round pores are formed in the sintered alloy.(2) W5⁄50 is improved at sintering temperatures higher than 1473 K and is almost constant (25.0 W/kg) at sintering temperatures up to 1673 K.(3) Grain growth of the sintered alloy does not affect the coercive force contrary to expectation, since intermetallic inclusions are formed in the sintered alloy.