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Permanent link (DOI): https://doi.org/10.7939/R3VB02

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Quantitative characterization of microstructure in high strength microalloyed steels Open Access

Descriptions

Other title
Subject/Keyword
Microstructure
TMCP
Texture
EBSD
Microalloyed steel
Rietveld method
Cooling rate
Subgrain size
Coiling temperature
Dislocation density
Retained austenite
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Li, Xiujun
Supervisor and department
Ivey, Douglas (Department of Chemical and Materials Engineering)
Henein, Hani (Department of Chemical and Materials Engineering)
Examining committee member and department
Henein, Hani (Department of Chemical and Materials Engineering)
Xia, Zihui (Mechanical Engineering)
Chen, Weixing (Department of Chemical and Materials Engineering)
Ivey, Douglas (Department of Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2009-08-21T17:22:52Z
Graduation date
2009-11
Degree
Master of Science in Materials Engineering
Degree level
Master's
Abstract
X-ray diffraction (XRD) profile fitting (Rietveld method) was used in this study to characterize the microstructure for seven microalloyed steels, which were produced through thermomechanical controlled processing (TMCP). Microstructure characterization was conducted through the strip thickness. The microstructural variables studied include subgrain size, dislocation density, texture index and weight percent of retained austenite. The subgrain size was also analyzed by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The effects of processing parameters, including coiling temperature, cooling rate and alloying elements, on the microstructure were also investigated. It was found that decreasing the coiling temperature resulted in a finer subgrain size and higher dislocation densities. The texture index was observed to increase with decreasing coiling temperature. The subgrain size decreased and dislocation density increased as the amount of alloying elements (Ni, Mo and Mn) were increased. The amount of retained austenite increased at the strip center with increasing coiling temperature and increasing C and Ni content.
Language
English
DOI
doi:10.7939/R3VB02
Rights
License granted by Xiujun Li (xiujun@ualberta.ca) on 2009-08-20T18:34:04Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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