Improved Processing Technique for Preparation of Non-Oriented Electrical Steels with Low Coercivity

I. Petryshynetsa, F. Kovaca, J. Marcinb, I. Škorvanekb aInstitute of Materials Research SAS, Watsonova 47, 040 01 Košice, Slovakia bInstitute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia

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In order to improve soft magnetic properties of vacuum degassed NO steels, an adjusted temper rolling process for development of particular textures {100}<0vw> was used. The main idea here relies on a deformation-induced grain growth, which promotes preferable formation of the grains with desired orientation. Two vacuum degassed NO steels were chosen as an experimental material. In both cases, a coarse or columnar grained microstructure, with pronounced intensity of cube and Goss texture components, was achieved during a continuous final annealing. The obtained microstructure leads to a significant decrease of coercivity, measured in DC magnetic field. The coercivity of steel with silicon content 2.4 wt.% decreased from 42 A/m to 17 A/m. Even more remarkable improvement of the soft magnetic properties was observed for the steel with Si 0.6 wt.%, where the coercivity value dropped from 68 A/m to 12.7 A/m.

DOI: 10.12693/APhysPolA.126.182 PACS numbers: 61.72.-y, 61.72.Cc, 81.40.Ef, 75.50.Vv