Effect of ordering on magnetic properties of 6.5-percent silicon-iron alloy

Narita, Kozo; Enokizono, Masato

doi:10.1109/tmag.1979.1060174

Cited by 71 publications

(24 citation statements)

References 4 publications

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“…It is well established that D0 3 ordering causes deterioration of magnetic properties in magnetic permeability experiments [98] and as such, high maximum permeability is obtained after rapid quench from 500 o C for Si-contents near 12 at. %, although a strong D03 ordering decreases magnetostriction [41] . Magnetic moment of iron depends on the position in the lattice: for iron atoms surrounded by iron, the value is close to 2.4 m B while for atoms surrounded by iron and silicon atoms (D0 3 configuration), the value drops to approximately 1.3 m B [99] according to neutron diffraction measurements.…”

Section: Influence Of Ordering On Electric and Magnetic Propertiesmentioning

confidence: 98%

“…This superstructure was proposed due to the decrease of the X-ray diffraction (111) line, typical for D0 3 , while the (200) line, typical of B2 order, became stronger after the sample was quenched [37] . TEM and neutron diffraction experiments reported presence of B2 and absence of D0 3 for different thermal treatments on a range of Si-contents [38][39][40][41] . Currently this phase is known in literature as the B2 phase, according to the Strukturbericht-designation.…”

Section: Figura 2 Diagrama De Fases Del Sistema Fe-si Según Kubaschementioning

confidence: 99%

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A review of ordering phenomena in iron-silicon alloys

Villafañe¹,

Houbaert²

2013

REVMETAL

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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. KeywordsOrdering; Iron-silicon alloys; Intermetallic phases; Mechanical properties; Phase diagram. Revisión de fenómenos de orden en aleaciones hierro-silicio ResumenEl acero al silicio es una aleación de importancia industrial, caracterizada por propiedades magnéticas blandas, bajas pérdidas por corrientes de Foucault y baja magnetostricción. Los aceros al silicio tienen ciclo de histéresis estrecho, lo que es una ventaja en aplicaciones con campos electromagnéticos, como transformadores, generadores, núcleos de motores eléctricos y otros componentes industriales. A pesar de su incomparable valor industrial, no hay convenio sobre la estructura atómica del acero al silicio. Obtener mayor conocimiento sobre los procesos de orden no sólo podría explicar las propiedades magnéticas sino que también podría abrir vías para la reducción de sus características más débiles, como su fragilidad, la cual afecta negativamente a la fabricación del acero al silicio y se asocia con altos costes de producción. Esta revisión resume los últimos conocimientos sobre orden en acero al silicio y describe las técnicas experimentales más importantes usadas para estudiar su estructura. Además, se da una explicación sobre la construcción de la parte rica en hierro del diagrama de fases del Fe-Si. Por último se ilustra la influencia del orden en las propiedades magnéticas y mecánicas. Palabras claveOrden; Aleaciones hierro-silicio; Fases intermetálicas; Propiedades mecánicas; Diagrama de fases.

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Section: Influence Of Ordering On Electric and Magnetic Propertiesmentioning

confidence: 98%

Section: Figura 2 Diagrama De Fases Del Sistema Fe-si Según Kubaschementioning

confidence: 99%

A review of ordering phenomena in iron-silicon alloys

Villafañe¹,

Houbaert²

2013

REVMETAL

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“…As the amount of micro-segregation is generally below 2~3 %, ao (≈32 at.%) is much larger than β, and hence the total electrical resistance can be expressed briefly using the approximation ln(1+x)≈x: (8) Therefore, the derivative of electrical resistance by the amplitude of the concentration profile (β) is positive: (9) That means, if a specimen is homogenized, the electrical resistivity decreases.…”

Section: The Effect Of Micro-segregation On Electrical Resistivitymentioning

confidence: 99%

“…In some works [8][9][10][11], a conventional casting process and subsequent heat treatments were used to remove the ordered phases and thereby improve the cold workability of high Si steels. The suppression of ordered phases is strongly affected by the Si level and the cooling rate after heat treatment [10].…”

Section: Introductionmentioning

confidence: 99%

The effects of heat treatment condition and Si distribution on order-disorder transition in high Si steels

et al. 2004

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The decomposition and formation of ordered phases in steels with 5 to 6.5 %Si were investigated by a combined analysis of TEM and electrical resistivity measurements in order to determine the optimal heat treatment conditions for removal of ordered phases. TEM diffraction pattern study revealed that B2 ordered phase in 6.5 %Si steel was sufficiently dissolved by heat treatment at 850 o C for 1 h, and then rapidly re-formed during cooling. The critical cooling rate, above which the suppression of B2 phase formation was possible, increased rapidly with Si content higher than 5.6 %. D0 3 phase appeared only in the case of as-cast samples containing Si content as high as 6.5 %. The measurement of electrical resistivity change during the heat treatment showed that the atomic movement was substantially spurred above 800 o C, resulting in an active order-disorder transition. The removal of solidification segregation is necessary to reduce the amount of B2 ordered phase in the as-cast or hot-rolled state, to lower the heat treatment temperature for dissolution of B2 ordered phase, and to shorten the heat treatment time.

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“…The DO3 phase has been observed only in low cooling rate processing. Narita and Enokisono [9] studied the magnetic properties of a Fe + Si6.5 wt% alloy and concluded that the DO3 ordered structure was more effective in improving the magnetic properties than the B2 ordered phase. However Degauque et al [10] concluded that losses were lower in the Fe + Si6.5 wt% ribbons (which involved B2 ordered phase) than in those involving DO3 ordered structure.…”

Section: Introductionmentioning

confidence: 99%