Title page for etd-0630118-135545


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URN etd-0630118-135545
Author Tzu-hsien Wen
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2017
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Effect of Hot Band Annealing and Strain Mode Change on the through-thickness Texture Evolution in Non-oriented Electrical Steel
Date of Defense 2018-07-24
Page Count 260
Keyword
  • non-oriented electrical steel
  • texture
  • strain mode
  • recrystallization
  • electron backscatter diffraction
  • hot band annealed
  • Abstract This study mainly focuses on the influence of hot band annealing process, which are annealing pickling line (APL) and batch annealing (BA), and the strain mode change of the hot rolled specimen in the following cold rolling (CR) process on the textures and microstructures formation of a non-oriented electrical steel (NOES). Texture evolutions after final annealing treatments on the CR specimens were also observed.
    X-ray diffraction (XRD) was used to analyze the macrotextures, and using the electron backscatter diffraction (EBSD) was used to analyze the microtextures. These two methods were used to observe and understand the influence of the hot band annealed microstructures and textures in the following CR strain mode change on the textures and micrstructures of the non-oriented electrical steel sheets at two different scales.
    According to the results of XRD and EBSD experiments, it was found that the two annealing processes caused different microstructures and texture distributions on the hot-rolled and annealed specimens. After cold rolling, due to microstructures, texture, and strain modes of the hot band annealed microstructure, the microstructures of the specimens show different distributions in the different locations of the specimens. These factors further affect the annealed microstructure of the cold rolled specimens.
    The full recrystallized textures this NOES of both APL and BA hot band annealed followed by CR specimens were obtained after heat treatments. The difference between the two spcimens (APL vs. BA) was found to be mainly the proportions of Goss orientation, in which the NOES sheets produced by BA specimen has a higher Goss orientation after the complete of recrystallization.
    Advisory Committee
  • Liu-wen Chang - chair
  • Po-we Kao - co-chair
  • Pei-ling Sun - advisor
  • Files
  • etd-0630118-135545.pdf
  • Indicate in-campus at 2 year and off-campus access at 99 year.
    Date of Submission 2018-08-03

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