Effect of VC Nano-Inhibitors and Dynamic Continuous Annealing on the Magnetic Properties of GO Steels

We report on novel approach for the abnormal growth of Goss grains that employs the system of VC nano-precipitates in combination with a phenomenon of the deformation induced grain growth. The laboratory slab of grain oriented steel was subjected to hot rolling with reduction of the thickness of sheet to 2.2 mm. The influence of coiling temperature on the distribution of VC particles was analyzed by TEM. The obtained results have confirmed the presence of VC nanoparticles with a typical size of 5-15 nm located preferentially in the vicinity of grain boundaries. Subsequently, the hot rolled strips were subjected to the cold rolling with the reduction epsilon similar to 84%, followed by primary recrystallization, temper rolling and final annealing in dynamic conditions at 1050 degrees C. This procedure led to evolution of the sufficiently strong {110}< 001 > Goss texture, which follows in the soft magnetic behavior comparable to that obtained in the long-time heat treated industrial GO steels. Thus, the proposed approach allows reach the equal material's quality at significantly shortened manufacturing time and lower energy consumption as compared to the conventional process of GO steel fabrication.