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Hi-B silicon steel; laser scribing; domain refinement; power loss

Non-contact processing technique involving the use of CW and pulsed CO₂ laser irradiation has been used for reducing the core loss of cold-rolled grain-oriented silicon steel. Laser scribing perpendicular to the rolling direction resulted in a refinement of domain wall spacing which subsequently reduced the loss of silicon steel. It was found that laser irradiation was more effective in a specimen with higher magnetic induction (Hi-B) and the loss was reduced by more than 10% under optimum conditions of the laser irradiation and the scribing speed. Since laser processing is a non-contact technique, it can be easily applied to the production line of the silicon steel.

S C Patil¹ G Swaminathan^{1 2} Manoj Kumar^{1 2} P V Sastry^{1 2} S B Ogale¹ S M Kanetkar¹ A Pramanik^{1 2}

1. Centre for Advanced Studies in Materials Science and Solid State Physics, Department of Physics, University of Poona, Pune - 411 007, India
2. Corporate Research and Development Division, Bharat Heavy Electricals Limited, Vikasnagar, Hyderabad - 500 593, India

Published

October 1991

Manuscript received

29 December 1990

Manuscript revised

23 May 1991