Title page for etd-0701113-004909


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URN etd-0701113-004909
Author Shu-Yu Wu
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Effect of Heating Rate on the Development of Annealing Texture in Nonoriented Electrical Steel
Date of Defense 2013-06-21
Page Count 94
Keyword
  • electron backscattered diffraction (EBSD)
  • nonoriented electrical steels (NOES)
  • recrystallization
  • texture
  • Abstract In this study, two heating rates, 0.5 ℃/s and 15 ℃/s, are applied to the annealing process in the production of nonoriented electrical steels (NOES). The effect of heating rate on the texture evolution is analyzed based on the recrystallized fraction in the recrystallization stage and the grain size in the grain growth stage.
       At the stage of recrystallization, no significant difference is found on the fully-recrystallized texture and the average grain size obtained by the two heating rates. Moreover, the results of macrotexture analysis reveal that the evolution of recrystallized texture is similar on both of the heating rate conditions. It is proposed that the heating rate, in the range of 0.5 ℃/s to 15 ℃/s, might not affect the evolution of the recrystallized texture, which is mainly determined by the cold-rolled microstructure. The orientation image mapping (OIM) of electron backscattered diffraction (EBSD) indicates that the density of high angle boundary in the deformed γ-fiber grains is more intensive than in the deformed α-fiber grains, and most of the new grains nucleate at the deformed γ-fiber matrixes. Accordingly, it is suggested that the recrystallized nuclei in the deformed γ-fiber grains might be the key to the annealing texture.
       At the stage of grain growth, with an increase of average gain size, the Goss component {011}<100> decreases more faster in the condition of 0.5 ℃/s. However, the EBSD data obtained in this study cannot explain this phenomenon. It appears to be worthy of future investigation.
    Advisory Committee
  • Liu-wen Chang - chair
  • Pei-Ling Sun - co-chair
  • Po-We Kao - advisor
  • Files
  • etd-0701113-004909.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2013-08-01

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