| 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. Hot band annealing temperature influences the microstructure, grain size and texture of cold rolled steel sheet after final annealing. For steel, （100）＜uvw＞ texture is benefit to its magnetic properties. Therefore, hot band annealing temperature and various process parameters have close relationship with magnetic properties.
In this study, four heats of non-oriented electrical steels with various aluminum, range from 0.33 to 1.67 wt%, and three hot band annealing temperature at 950℃、1000℃、1050℃ were performed to investigate their effects on the microstructure, texture and magnetic properties of final product. During hot band annealed at 1000oC, it was found that grain size of cold rolled steel sheet after final annealing decreased with increasing aluminum content and reached a valley at 0.88wt% and then went up to a maximum value at 1.30wt%. Finally, it declined. If hot band annealed at 1050℃, grain size monotonically decreased with increasing aluminum content while cold rolled sheet annealed at temperature higher than 975℃. If hot band annealed at 1000oC, flux density monotonically decreased with increasing aluminum after final annealing at temperature higher than 975℃. Furthermore, flux density decreased with increasing final annealing temperature. On the other band, core loss increased with increasing aluminum content while final annealing at temperature lower than 1000℃. Furthermore, core loss increased with increasing final annealing temperature. If hot band annealed at 1000℃ and final annealed at 950℃, the intensity of （001）＜100＞ texture decreased with increasing aluminum content. On contrary, the intensity of （011）＜100＞ intensity increased with increasing aluminum content. However, the intensity of （111）＜uvw＞ texture increased with increasing aluminum content. The magnetic properties were influenced by the combined factors of aluminum content, grain size and texture.
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