关键词: 取向硅钢, 织构, 夹杂物, 钇微合金化

Abstract: The oriented silicon steel 0.04%-0.05% C, 3.03% -3.10% Si with yttrium contents of 0.026% , 0.058% and 0.14% are prepared in the laboratory by the 50 kg vacuum-induction furnace through conventional process. The composition, morphology, quantity, size and distribution of inclusions in steel are studied by SEM. The microstructure and texture of oriented silicon steel 2.4 mm hot rolled plate, 0.3 mm cold rolled sheet and a nnealed at 830 °C and 1050 °C are analyzed by OM and EBSD. The experimental results show that, with increasing Y content in steel, the size of inclusions becomes larger and the long-bar inclusions change to a spherical shape, their inhabitation becomes weaker. Therefore, the grain size after primary recrystallization gradually increases with increasing Y content. With Y content of 0. 026% silicon steel, the grain size after primary recrystallization is the smallest. The high storage energy of small grains provides a sufficient driving force for the high temperature annealing grain growth. Therefore, the average grain size after high temperature annealing is 115.7 μm, which is the largest. In the silicon steel with Y content of 0.026% , some Goss grains grow abnormally and Goss ( {110} ＜001＞) texture with strength of 5 appears, while a large amount of y texture still existed in silicon steel with Y content of 0.058% and 0.14%. Since the inclusion size in 0.026% Y steel is the smallest, it has a certain pinning effect, which makes the primary recrystallized grain finer. With the increase of Y content, the size of inclusions in 0.058% Y and 0.14% Y steel increase obviously, which weakens its inhibition on grain growth in the primary recrystallization process.

Key words: Oriented Silicon Steel , Texture , Inclusions , Yttrium Microalloying