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Modification of the Stress-Strain Curve for High-Strength Line Pipe Steel Open Access


Other title
microalloyed steel
mechanical properties
Type of item
Degree grantor
University of Alberta
Author or creator
Jonsson, Katherine M.
Supervisor and department
Henein, Hani (Chemical and Materials Engineering)
Examining committee member and department
Henein, Hani (Chemical and Materials Engineering)
Jar, Benjamin (Mechanical Engineering)
Ivey, Douglas (Chemical and Materials Engineering)
Department of Chemical and Materials Engineering
Materials Engineering
Date accepted
Graduation date
Master of Science
Degree level
This thesis presents work performed to improve the work hardening behaviour of an X80 microalloyed steel through various Interrupted Thermal Treatments (ITT). The aim of this work was to determine the relationships between thermal history, microstructure and mechanical properties through both qualitative and quantitative measures. A Continuous Cooling Transformation (CCT) diagram was constructed under no-strain conditions to identify the transformation temperatures and products. The thermal treatments were applied using a Gleeble thermal-mechanical simulator to generate a variety of microstructures in various fractions and morphologies. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to investigate and quantify the microstructures in terms of phase fraction and grain size. The ITT experiments successfully generated microstructures comprising ferrite, bainitic ferrite, martensite and martensite-austenite (M-A) without strain. The effect of cooling rates, interrupt temperature, re-heat temperature and hold times were investigated and the mechanical performance was correlated with the quantified microstructures.
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 these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before 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.
Citation for previous publication
Jonsson, K (2012). The Effect of Microstructure on the Mechanical Properties of X80 Microalloyed Steel. AIST.Jonsson, K (2012). The Effect of Microstructure on Tensile Behaviour of X80 Microalloyed Steel. IPC.Jonsson, K (2011). The Effect of Microstructure on the Mechanical Properties of X80 Microalloyed Steel. MS&T.

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