Effects of pulsed laser ablation with various patterns on non-oriented electrical steels magnetic properties

Surface laser treatments can help improving soft magnetic materials properties through iron losses reduction which allows to increase the efficiency of electrical machines comprising Grain-Oriented Electrical Steels (GOES). What about surface laser treated Non-Grain-Oriented Electrical Steels (NOES) that remain very scarcely studied? In this work supported by experimental results, a laser process called ablation created with advanced Ultra-Short Pulse Laser (USPL) is studied and valued. Several sets of laser parameters and dot patterns are tested with the aim to investigate potential laser impacts unlocked by such technology on power losses and magnetic properties of a NOES grade. Experimental measurements are synthetized through a parametric study which led to find the optimized configuration amongst tested ones. The detailed analysis of the latter shows that improvement of magnetic properties of NOES using an USPL process is possible and may be compared to loss reductions obtained on laser treated GOES if absolute values are considered.