| Summary: | 碩士 === 國立雲林科技大學 === 機械工程系 === 104 === Non-oriented electrical steel is an important functional material. Its magnetic properties directly affect the energy efficiency of lamination motors. η-fiber texture is benefit to the magnetic property. On the other hand, γ-fiber texture is deleterious to the magnetic property. In this study, the effect of process parameter, such as hot band annealing by BA process and CA process, temper rolling reduction from 0 to 12% on the microstructure, grain size, texture and magnetic properties of high aluminum bearing non-oriented electrical steel were investigated. It was found that both cold rolled steel sheet annealing temperature and temper rolling reduction had great influence on the microstructure and texture of electrical steel after final annealing. Grain size of steel sheet after final annealing was 10 to 15μm larger thanthat of cold rolled sheet annealing. Furthermore, if steel sheets by BA process were annealed at 600 - 700℃, their η-fiber textures were strong and γ-fiber texture became weak. Therefore, their magnetic properties were better. Moreover, steel sheet by CA process could possess strong η-fiber texture. Steel sheet with 4% temper reduction had weak γ-fiber texture. EBSD was also conducted to measure the grain orientation.
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