Effects of pulsed laser ablation with non-conventional patterns on rotational magnetic properties of grain-oriented electrical steels

Le résumé fourni par la source

Classical laser treatments (irradiation, scribing) are commonly used to improve magnetic properties of Grain-Oriented Electrical Steels (GOES) along their Rolling Direction (RD). Besides them, a new process called ablation performed with UltraShort Pulsed Lasers (USPL) has recently been developed. It can boost GOES's magnetic properties along the RD, along the Transverse Direction (TD) and along other directions providing laser pattern adjustments to optimize performances in each case. However, these enhancements only concern 1-directional alternating fields. In this work, the impacts of an ablation process on GOES's magnetic properties under rotational excitation are investigated. A pattern adapted for RD excitation, several patterns adapted for TD / close to TD excitations and a combination of both types of patterns are used and compared. Experimental results show that the ablation process can also reduce GOES's rotational losses with interesting reduction rates. The necessity of adjusting the laser pattern to excitation conditions is confirmed, especially when the field rotates.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.