Effects of silicon content on properties of gas-atomized Fe-Si-Cr powders
Fe-Si soft magnetic composites, SMC have some advantages such as excellent dc current superimposed permeability and low core loss over ferrite and Fe-Si bulk cores.
Effect of ordering on magnetic properties of 6.5-percent silicon-iron alloy
The effect of ordering on the magnetic properties such as magnetostriction, magnetic anisotropy, permeability, and coercive force of 6.5-percent silicon-iron alloy has been studied. The alloys were heat-treated at various temperature, and then quenched into oil. It was found that magnetostriction decreases with the growth of DO 3 structure and magnetic anisotropy decreases with the growth of B 2 structure. By oil-quenching from 500°C, permeability became a maximum and coercive force became a minimum. The effect is caused by the growth of DO 3 structure. The improvement of the magnetic properties of 6.5-percent silicon-iron alloy was attained by controlling the ordering in this alloy through the double heat treatment. The values obtained were maximum permeability μm = 52 000, initial permeability \mu_{i} = 4000 , and coercive force H c = 0.088 Oe measured at the maximum induction of 10 kG.
A review of ordering phenomena in iron-silicon alloys
Silicon steel is an industrially-desired alloy of iron and silicon, characterised by soft magnetic properties, low eddy-current losses, and low magnetostriction. Silicon steels have narrow hysteresis cycles, making them particularly advantageous in applications using electromagnetic fields, such as transformers, generators, electric motor cores, and few other components in industry. Despite its incontestable industrial value, there is not much agreement on the atomic structure of silicon steel. Gaining better understanding of e.g. ordering processes in Fe-Si alloys could not only explain their magnetic properties, but also open opportunities to reduce their weaker characteristics, such as brittleness that adversely affects silicon steel workability and its associated high production costs. This review summarises the state-of-the-art knowledge about ordering in silicon steel and describes the most relevant experimental techniques used for studying its microstructure. In addition, the process of building the iron rich part of the Fe-Si phase diagram is explained. Lastly, the influence of order on the alloy’s magnetic and mechanical properties is illustrated.