Abstract

Electrical steel sheets are mainly produced from Fe–Si–C alloys. Non-oriented electrical steels contain, in addition to the important alloying elements Si, Al and Mn, other elements that determine the characteristics of the electrical steel. Al and Mn form the non-metallic inclusions AlN and MnS, which inhibit secondary recrystallization in the steel sheets. This influences both the texture development and the magnetic properties. The aim of this study was to analyze the morphology of the non-metallic inclusions in the non-oriented electrical steel sheet containing copper and selenium additions. The Fe–Si–Al alloy was produced in a laboratory vacuum-induction furnace, hot formed and then finally cold formed into a steel sheet. To achieve the optimum magnetic properties the steel sheet was decarburized in a H 2/H 2O gas mixture. The morphology of the non-metallic inclusions in the steel sheet prior to, and after, decarburization annealing at 840°C and their modification by the addition of the alloying elements Cu and Se were investigated using HRAES.

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