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采用双辊薄带连铸工艺试制了1.7%Si无取向硅钢铸带,并采用光学显微镜及电子背散射衍射(EBSD)技术研究了其在铸轧及随后的冷轧和退火过程中的组织和织构演变特征。结果表明:铸带表层至中间层为粗大的等轴晶粒,中心层为细小的等轴晶。铸带织构为强的<100>∥ND织构,铸带冷轧后的冷轧组织中存在大量剪切带,冷轧织构由强的<110>//RD和较弱的<111>//ND织构组成。冷轧板经900℃退火后出现强的{001}<130>再结晶织构,再结晶织构的形成可以解释为择优形核和晶粒的择优长大机制。
The production of 1.7% Si non-oriented silicon steel cast strip by twin-roll strip casting was studied. The microstructure and properties of the cast strip during cold rolling and subsequent cold rolling and annealing were studied by optical microscopy and electron backscatter diffraction (EBSD) Texture evolution characteristics. The results show that the superficial equiaxed grains from the surface to the middle of the casting belt are thin equiaxed grains. The texture of the cast strip is a strong <100> ∥ND texture with a large number of shear bands in the cold-rolled microstructure after cold-rolling of the cast strip. The cold-rolled texture consists of a strong <110> // RD and a weaker <111 > // ND texture composition. The strong {001} <130> recrystallization texture of the cold-rolled sheet after annealing at 900 ℃ appears. The recrystallization texture formation can be explained as the preferred nucleation and grain growth mechanism.