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Permanent link (DOI): https://doi.org/10.7939/R3N08S

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Ultrasonic Evaluation of Microstructure in Pipe Steels Open Access

Descriptions

Other title
Subject/Keyword
X70
steel
microalloyed steel
L80
Ultrasonic
pipe
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Kennedy, Jacob R
Supervisor and department
Ivey, Douglas (Chemical and Materials Engineering)
Henein, Hani (Chemical and Materials Engineering)
Examining committee member and department
Li, Leijun (Chemical and Materials Engineering)
Ivey, Douglas (Chemical and Materials Engineering)
Henein, Hani (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization
Materials Engineering
Date accepted
2015-02-06T08:44:19Z
Graduation date
2015-06
Degree
Master of Science
Degree level
Master's
Abstract
Traditionally in pipeline steels and welds, ultrasonic testing (UT) has been used for crack and/or flaw detection. The work presented in this Thesis explores the use of this technique to characterize the microstructure of pipe steels. Ultrasonic velocity calculations, for shear and longitudinal waves, done with the stiffness tensor of a 1050 steel showed that shear velocity exhibits a greater difference between structures such as ferrite, mixed ferrite-pearlite, and martensite, than longitudinal velocity. Experiments were carried out, through thickness skelp investigation of L80 and X70 steels, annealing of interstitial free steel and structure variation in L80, 4130 and 5160. The ultrasonic velocity and attenuation of shear and longitudinal waves were measured through the thickness of L80 and X70 pipe skelps and did not vary significantly. XRD was performed through the thickness as well. Interstitial free steel was ultrasonically tested at room temperature after different annealing times. Both shear and longitudinal ultrasonic velocity changed as recrystallization progressed, while attenuation changed during grain growth. Structure variations after heat treatment in L80, 4130 and 5160 all showed a decrease in ultrasonic shear wave velocity in martensite when compared with mixed structure of ferrite and pearlite, confirming the velocity calculation results. The longitudinal velocity did not vary with structure. The attenuation of both shear and longitudinal waves also decreased in martensite compared with mixed ferrite-pearlite. Both shear and longitudinal ultrasonic waves had properties which varied with different structural properties and had the potential to be useful tools in microstructural characterization. The ultrasonic shear velocity showed a decrease from ferrite-pearlite (3268 m/s) to martensite (3207 m/s) as did the longitudinal attenuation (0.25 dB/mm for ferrite-pearlite and 0.17 dB/mm for martensite)
Language
English
DOI
doi:10.7939/R3N08S
Rights
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.
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