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Title page for etd-0808117-113849


URN etd-0808117-113849 Statistics This thesis had been viewed 312 times. Download 0 times.
Author Jhih-Hsiang Ma
Author's Email Address g10407013@gmail.com
Department Materials Engineering
Year 2016 Semester 2
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 99
Title Retained Austenite and its Elimination of the Induction Hardened Case of Gray Cast Irons
Keyword
  • XRD method
  • Retained austenite
  • Induction Hardening
  • Cast Iron
  • Cast Iron
  • Induction Hardening
  • Retained austenite
  • XRD method
  • Abstract Cast iron is mainly used to add a large number of silicon and carbon content greater than 2.1wt% of the iron and carbon alloy, can be widely used in processing machine tools. However, large-scale machine is not easy to heat the whole piece, and the whole heat treatment will lead to increased hardness and strength, brittle damage is usually accompanied by the problem. In the process of induction hardening and quenching, both matensite and with the retained austenite iron were formed the case. Retained austenite was transformed during the application an unstable structure. So it is important to reduce the retained austenite in the hardened structure. In this study, the power and the speed of the coil were changed, to confirm the production of retained austenite of induction harden case of cast iron. The microstructures of the test pieces were observed by X - ray diffraction (XRD) in a cosmic method. The hardening depth curves were measured by Vickers hardness tester. The experimental results show that the lower the hardening speed is during induction hardening treatment for FC350 cast irons, the lower the hardening speed, the higher hardness of the hardened layer is. After the cryogenic treatment, the resulting retained austenite in the hardened cast iron can be effectively eliminated.
    Advisor Committee
  • Liu-Ho Chiu - advisor
  • Cheng-Hsun Hsu - co-chair
  • Heng Chang - co-chair
  • Files indicate in-campus access only
    Date of Defense 2017-07-27 Date of Submission 2017-08-21


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