Title page for etd-0811117-210131


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URN etd-0811117-210131
Author Jui-Wen Liao
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2017
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Investigation of the Microstructure and Texture Evolution during Isothermal Annealing in a Non-oriented Electrical Steel
Date of Defense 2017-08-24
Page Count 152
Keyword
  • texteure
  • recrystallization
  • EBSD
  • non-oriented electrical steel
  • Annealing time
  • isothermal annealing
  • Abstract The aim of this work is to understand the isothermal annealing behavior of a 2.54 wt% Si non-oriented electrical steel, which was previously cold rolled to a 85% rolling reduction. Isothermal experiments were carried out at three different temperature, 580°C, 600°C and 620°C respectively, and hold with different period of annealing time. The effect of annealing time on the microstructures and textures of the specimens was investigated.
    The macrotextures were analyzed by X-ray diffraction (XRD) pole figures measurements. The results shows that the intensities of {111}<110> of the specimens annealed at 620°C decreases faster than the ones of the specimens annealed at 600°C. The Cube intensity appears after annealing 620°C for 3, 6 minutes and 3 hours. But Rotated cube remains with increasing annealing time. The Goss intensity increases apparently after annealing 600℃ for 10 minutes and 1 hour. The {111}<112> intensity decreases first and then increases at 600℃ and 620℃ isothermal experiment. At 580℃ isothermal experiment, the {111}<112> intensity decreases with 48 hours holding time.
    Ex-situ experiments were carried out by the electron backscattered diffraction (EBSD) to analyze the microstructures and microtextures. The results show that after annealing 620℃ for 9 minutes, the are fraction of Cube become the largest, the area fraction of {111}<112> decreases apparently after 620℃ for 3 hours. When the annealing time is increased, there are two ways to consume the α-fiber grain. The first one is boundaries of recrystallized grains move toward to the interior of α-fiber grains, the second is the SIBM.
    Predicting the potential recrystallization nuclei find that the isothermal experiment carry out orientation nucleation.
    Comparing to isothermal annealing and isochronal annealing, the area fraction, grain size and the ratio of recrystallized grains in four texture component, Cube, Goss, {111}<110>, and {111}<112>, show that the recovery process during the isothermal annealing effect on the texture evolution.
    Advisory Committee
  • Liuwen Chang - chair
  • Po-We Kao - co-chair
  • Pei-Ling Sun - advisor
  • Files
  • etd-0811117-210131.pdf
  • Indicate in-campus at 2 year and off-campus access at 99 year.
    Date of Submission 2017-09-11

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