Title page for etd-0806104-115622


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URN etd-0806104-115622
Author Wei-Zheng Huang
Author's Email Address mit_chemical@yahoo.com.tw
Statistics This thesis had been viewed 5331 times. Download 898 times.
Department Materials Science and Engineering
Year 2003
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Observation of Dislocation Morphologies in Front of Fatigue Crack Tips of IF Steel
Date of Defense 2004-07-26
Page Count 83
Keyword
  • fatigue
  • crack propagation
  • IF steel
  • Abstract IF Steel to be used in this thesis which only have 50ppm carbon is approach Iron. It to be part of BCC. Because BCC material have much slip system when increase the cycle will induce to create multiple slip system. The dislocation structure often to become cell. We observation the same result of SEM and TEM in low cycle fatigue. The cell size is small in high plastic strain amplitude. The cell size is big in low strain amplitude.
    The difference of dislocation structures in front of crack tip which obtained under propagation rates o f 10-4, 10-5, 10-6 and 10-7 mm/cycle is the volume percentage occupied by the dislocation structures viz. misorientation cell, cell, wall, PSBs.
    Advisory Committee
  • Po-We Kao - chair
  • none - co-chair
  • New-Jin Ho - advisor
  • Files
  • etd-0806104-115622.pdf
  • indicate access worldwide
    Date of Submission 2004-08-06

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