A nonconstact technique for reducing the core loss of a grain oriented silicon steel has been developed by the use of Q-switched laser irradiation. Vaporization of the surface layer of the silicon steel by the laser irradiation induced a stress which resulted in a refinement of 180° domain wall spacing. This phenomenon reduced the core loss of the steel. It was found that the laser irradiation was more effective in a specimen with a higher magnetic induction and the core loss reduced by more than 10% under the optimum condition of the laser irradiation. Since the laser processing is a noncontact technique, it is easily applicable to the production line of the silicon steel.
Effects of carbon content on primar)1 recrystallization texture, AIN p recil)itation , grain size and dmwability are investigaled on Fe-A IN alloys qf vmying composition , with A l from less than 0.005% up 10 0.06%, with N from less than 0.002% up to 0. 02°~, and with Cfroln 0.001% Ul) to 0.04%. W ilh increasing carbon content, the amount of grains wilh {11 1} lauice plane I)arallel to the sheet plane decreases, the main component of primary rwystallizalion textu re changes from {ill } (110) to {554} <225>, grain size decreases , grain shape changes from Ihe " I)ancake" 10 Ihe equiaxial type, and the drawability decreases markedly. T hese effects of carbon content on various Inoperties qf Fe-AI-N alloys are rather inconspicuous for up to 0.0 J% but become extTeme!y marked when it exceeds O.Ol~o. They are explained by the effect of carbon conlent on A IN precil)itatioll during jJrecil)ilation treatment I)rior to cold rolling and during heating for the final annealing temperatu re.
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