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URN etd-0611117-202552
Author Kuan-Hao Lin
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2016
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Investigation of Cold-Rolled and Annealed Texture and Magnetic Properties of 1.24 wt.% Si and 2.54 wt.% Si Non-oriented Electrical Steels
Date of Defense 2017-06-05
Page Count 194
Keyword
  • non-oriented electrical steel
  • recrystallization
  • texture
  • grain growth
  • EBSD analysis
  • magnetic property
  • Abstract This study mainly focuses on the textures and magnetic properties of non-oriented electrical steels (NOES) which were rolled and annealed treatment. Polycrystalline materials usually have preferred orientations after rolling, and different orientations of the grains can affect the magnetic properties differently.
    In order to understand the variation of cold-rolled and recrystallized texture and magnetic properties of NOES hot-rolled which have 1.24 wt.% Si and 2.54 wt.% Si content. This study used NOES which the chemical composition are 1.24 wt.% Si and 2.54 wt.%Si hot-rolled and APL (annealing pickling line) treatment, and then cold rolled to 78% and 85% reduction by many passes, respectively. Infrared light heating furnace was applied to perform annealing experiments at the temperature ranges of 620°C and 900°C on the NOES to investigate the textures in the through-thickness direction, which included the recrystallized and the grain growth stages. By using X-ray diffractometer (XRD) pole figures to measure the macrotexture, and measure the surface layer of specimen. In order to measure the subsurface layer and mid-plane layer of the specimen, removing the surface layer by griding method. Finally, applied to the software and quantified and add up the texture component in each position of the specimen, and the observe the distribution of the texture in through-thickness direction. By using field emission gun scanning electron microscope (FEG-SEM) equipped on backscatter electron diffraction (EBSD) to analyze microtexture, observing the grain and analysing its Kikuchi line which consisted to electron backscatter diffraction pattern on the cross section plane of specimen, applied to software to analyze the grain orientation. And observing the texture distribution of recrystallized grains in annealed specimen. In the magnetic properties experiment, the magnetic induction, B50 and iron loss, W15/50 were measured.
    Theoretically, the texture components which can improve the magnetic properties are Cube-orientation and Goss-orientation. In the results of macro-and micro-texture analyses, the NOES hot-rolled in single phase area has higher Cube and Goss orientation intensities, and has more Cube and Goss orientated grains through the stage of recrystallization and grain growth. The results of the magnetic properties reveal that no matter the measuring direction is along RD or TD of the NOES, the 1.24 wt.% silicon NOES which was hot-rolled in single phase area has the higher magnetic induction. Thus, the NOES hot-rolled in single phase area and followed by the subsequent process has better magnetic properties.
    Advisory Committee
  • Luiwen Chang - chair
  • I-Ching Hsiao - co-chair
  • Po-We Kao - co-chair
  • Pei-Ling Sun - advisor
  • Files
  • etd-0611117-202552.pdf
  • Indicate in-campus at 2 year and off-campus access at 2 year.
    Date of Submission 2017-07-12

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