Magnetic properties of cold-rolled electrical steel after hot-air oxidation

Mes'kin, V. S.; Mishkevich, R. I.; Gauptman, A. G.; Korolev, N. V.

doi:10.1007/bf00819847

Cited by 2 publications

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“…The electrical resistivity of the oxide layer is one of the factors in the research of hot rolling process (9) . Oxidation improves the magnetic properties of hot-rolled electrical steels like transformer steels (10) . For optimization of magnetic properties, investigation of electrical resistivity of the oxide layer is also important.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Electrical Resistivity of Oxide Scale Formed under Different Conditions

Ali

Saka

Tohmyoh

et al. 2010

JMMP

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The nature of direct current potential drop (DCPD) on carbon steel (SS400) having different surface conditions is investigated in this study. The spring-loaded macroscopic DC four-point-probe sensor was used for the measurements of potential drop. Three samples from the same type of carbon steel are prepared under three different conditions, namely, exposures for short and long periods in atmosphere and heat treatment at low temperature of the sample experienced short exposure. In an attempt to verify the repeatability nature of DCPD, the measurements are performed on different locations of the test surface under the same experimental conditions and used for analysis. The natures of potential drop on oxide scale free surface and oxidized surfaces were compared. The effect of oxidized surfaces on DCPD in all the three cases is observed markedly. From these observations, it is worth understanding that the DCPD technique through spring-loaded macroscopic four-point-probe is able to distinguish the oxidized surface from oxide scale free surface. Finally, electrical resistivities of oxide scale in all the three cases were successfully evaluated by using electrical image method with oxidized sample considering as a two-layer structure. The almost unique value of evaluated electrical resistivity of oxide scale in all the cases indicates that the oxide materials are similar in type in respect to electrical resistivity.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Electrical Resistivity of Oxide Scale Formed under Different Conditions

Ali

Saka

Tohmyoh

et al. 2010

JMMP

View full text Add to dashboard Cite

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“…7) Determination of electrical resistivity of oxide scale deposited on metals is essentially important to know about the nature of protectiveness of oxide scale regarding the corrosion resistance. Similarly it is also essential for the magnetic properties of hot-rolled electrical steels 8) and contact potential in the research of hot rolling process. 9) Different methods for evaluation of properties and morphology of oxide films/thin films deposited by sputtering 10) on substrate and due to high temperature were studied previously using TEM, 11) SEM, 12) STM, X-ray diffractometry, 10) and microscopic four-point probe 11) etc.…”

Section: Introductionmentioning

confidence: 99%

Checking Surface Contamination and Determination of Electrical Resistivity of Oxide Scale Deposited on Low Carbon Steel by DC Potential Drop Method

Ali

Saka²,

Tohmyoh³

2010

Mater. Trans.

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This article describes about the nature of potential drops (PDs) on carbon steel (SS400) and stainless steel (SUS304). The experimental results showed the remarkable nature of potential drops on oxidized surface. Direct current PD (DCPD) technique was used to investigate the nature of potential drops on the test surfaces with probe contact time. The nature of PDs on oxidized and oxide scale free surfaces were compared for the same experimental conditions and it is easy to compare the contaminated surface with oxide scale free surface and to decide whether the surface is oxidized or clean. Oxidized test surface is considered as two layers of different resistivities. The effect of two layers on the potential drops was illuminated by electrical image method. Electrical resistivity of oxide scale was determined by DCPD technique on the basis of the two layers of different resistivities model. In an attempt to verify the accuracy and prove the validity of the proposed method, the electrical resistivity is also determined at different probe spacing and all the results are shown to be very proximate to one another.

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Magnetic properties of cold-rolled electrical steel after hot-air oxidation

Cited by 2 publications

References 0 publications

Evaluation of Electrical Resistivity of Oxide Scale Formed under Different Conditions

Evaluation of Electrical Resistivity of Oxide Scale Formed under Different Conditions

Checking Surface Contamination and Determination of Electrical Resistivity of Oxide Scale Deposited on Low Carbon Steel by DC Potential Drop Method

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