Effect of the production conditions of rapidly quenched ribbons of alloy Fe-6.5% Si on their structure and magnetic properties

Conclusions Rapid quenching in a protective atmosphere of carbon dioxide at an optimal combination of parameters improves substantially the quality of ribbons of alloy Fe-6.5 Si in comparison with ribbons obtained in air or with the use of helium or argon. Better quality of the ribbons improves substantially the level of their magnetic properties.The dispersity and homogeneity of the microstructure of the ribbons, determined by the cooling rate, depends, in addition to the thermal conductivity of the material of the quenching disk, on its adhesive property, i.e., on the area of actual contact between the melt and the forming ribbon on the one hand, and the disk on the other, and also on the duration of the contact.The ductility of rapidly quenched ribbons of alloy Fe-6.5% Si more than 40 m thick can be improved by their increased cooling rate in contact with the disk, and also by forced cooling after removal from the disk.The results obtained in the present work can be used in practice in the production of other rapidly quenched microcrystalline or amorphous alloys.Translated from Poroshkovaya Metallurgiya, No. 8(332), pp. 30–36, August, 1990.