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.