Comparison between laser thermal effects and ablation effects with ultrashort pulses laser on GO SiFe electrical steel

Julien Dupuy; Nesser Manar; Olivier Maloberti; Yves Hernandez

doi:10.1117/12.2505326

27 February 2019 Comparison between laser thermal effects and ablation effects with ultrashort pulses laser on GO SiFe electrical steel

Julien Dupuy, Nesser Manar, Olivier Maloberti, Yves Hernandez

Author Affiliations +

Proceedings Volume 10911, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VIII; 1091104 (2019) https://doi.org/10.1117/12.2505326
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

We investigate the influence of different laser parameters on Grain-Oriented electrical silicon steels (GO SiFe). The advanced use of ultra-short laser pulses for scribing steel sheets with magnetic domains refinement and loss reduction purpose is proposed. The GO steel samples are commercial ones, commonly used in transformer cores. We compare laser impact on domains refinement obtained by thermal effects (with CW and long laser pulses), with thermal-free ablation produced by an ultrashort source. The laser scribing conditions (power or pulse energy, speed and pattern geometry, size and orientation) are optimized to have minimal deformation on material surface, while maximizing the influence and benefits on the magnetic properties. The steels used for these experiments have got one fixed composition (Silicon Iron alloy with 3% Silicon), the sheets used have got one thickness of 0.23 mm, very big grains size around 3 mm in average and one preferred lamination direction. The effects of the laser on steel samples are studied with different techniques, in order to show the impact on the surface topography, the metal microstructure and on the scalar magnetic properties. The confocal microscopy is used to probe the surface topography. The MFM (Magnetic Force Microscopy) is used to analyze in detail the formation of magnetic domains in the vicinity of laser patterns at the nanoscopic scale. The MOKE microscopy (Magneto-Optic Kerr Effect) is used to get images of magnetic domains at the microscopic scale. The SST (Single Sheet Tester) and the Epstein frame are used to measure the static and dynamic behavior and the power losses with two or one directional flux at the macroscopic scale. The motivation is to find the best laser treatment and patterns to improve the scalar magnetic properties and to reduce the energy consumption of electrical devices made with this steel.

Citation Download Citation

Julien Dupuy, Nesser Manar, Olivier Maloberti, and Yves Hernandez "Comparison between laser thermal effects and ablation effects with ultrashort pulses laser on GO SiFe electrical steel", Proc. SPIE 10911, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems VIII, 1091104 (27 February 2019); https://doi.org/10.1117/12.2505326

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available