Title page for ETD etd-12212009-152146


Type of Document Master's Thesis
Author Wu, Chun-Hsien
Author's Email Address will172@vt.edu
URN etd-12212009-152146
Title Microstructure of Flash processed Steel Characterized by Electron Backscatter Diffraction
Degree Master of Science
Department Materials Science and Engineering
Advisory Committee
Advisor Name Title
Reynolds, William T. Jr. Committee Chair
Aning, Alexander O. Committee Member
Lu, P. Kathy Committee Member
Keywords
  • EBSD
  • flash processing
  • grain size
  • Misorientation
  • OIM
Date of Defense 2009-12-07
Availability unrestricted
Abstract
Flash processing is a new heat treatment process being developed to produce steel with

relatively high strength and ductility. It involves rapidly heating steel sheet or strip to a

temperature in the austenite range and quenching; the entire thermal cycle takes place within

15 seconds. The resulting microstructure is fine and difficult to resolve using standard

metallographic techniques. In this investigation, electron backscatter diffraction was used to

measure the grain size, grain orientations, and phase fractions in AISI 8620 samples flash

processed to a series of different maximum temperatures. The combination of high strength

with moderate ductility obtained by flash processing arises from a refined martensitic

microstructure. The morphology of the microstructure depends upon the maximum

processing temperature; a lower maximum temperature appears to produce a finer prior

austenite grain size and an equiaxed martensite structure whereas a higher maximum

processing temperature yields a more conventional lath martensite morphology.

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