Abstract
An experiment was designed to investigate the feasibility of surface modifying a fully processed, non-oriented, electrical steel sheet with antimony (Sb) using laser surface alloying (LSA). The post-exposure microstructural characterization of the modified steel sheet was performed using light microscopy (LM) and field-emission scanning electron microscopy (FE-SEM/EDS). Microhardness measurements confirmed the differences in the microhardness profile along the depth direction as a result of the applied laser-alloying treatment. The additive nature of the laser treatment and the specific cooling conditions create unique solidification conditions that ensure not only a high microhardness of approximately 400 HV0.1 of the modified layer, but also its fine-structured morphology.
Highlights
Non-oriented electrical steel sheets are soft magnetic materials produced from silicon steels
The positive effect of an Sb addition to silicon steels is reflected in a greater remanent induction and a lower coercive force, which should lead to a smaller area for the demagnetization loop and so to smaller inductive energy losses for nonoriented electrical steel sheet [6] and [7]
The oxidized surface of non-oriented electrical steels is a consequence of the fabrication route, which includes final annealings for decarburization and recrystallization (Figs. 2a and b)
Summary
Non-oriented electrical steel sheets are soft magnetic materials produced from silicon steels. Silicon steels are fundamental to the economy of electrical appliances, and offer the best combination for transmitting and distributing electrical energy. The properties required of these steels are high permeability and induction, low magnetic losses, and low magnetostriction [2]. Steels with a high content of silicon as the main alloying element are brittle and exhibit poor workability. The positive effect of an Sb addition to silicon steels is reflected in a greater remanent induction and a lower coercive force, which should lead to a smaller area for the demagnetization loop and so to smaller inductive energy losses for nonoriented electrical steel sheet [6] and [7]
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