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Permanent link (DOI): https://doi.org/10.7939/R3HB0Z

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Microstructure and properties of Ni-alloy and Ni-WC composite overlays Open Access

Descriptions

Other title
Subject/Keyword
NiBSi
dissolution
NiCrBSi
PTA
WC
microstructure
MMC
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Liyanage, Thilan
Supervisor and department
Gerlich, Adrian (Chemical and Materials Engineering)
Examining committee member and department
Nychka, John (Chemical and Materials Engineering)
Mendez, Patricio (Chemical and Materials Engineering)
Grondin, GY (Civil and Environmental Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2010-09-30T16:50:17Z
Graduation date
2010-11
Degree
Master of Science
Degree level
Master's
Abstract
The microstructures and performance of Ni-based alloys and Ni-WC (nickel-tungsten carbide) composite overlays deposited by plasma transferred arc welding have been studied. The Ni-alloy overlays had similar microstructures consisting of Ni dendrites, with interdendritic Ni-based eutectics, borides and carbides. Low hardness alloy overlays contained a smaller fraction of interdendritic phases relative to the high hardness alloys. The interdendritic regions make a significant contribution to the hardness since they are more than twice as hard as primary dendrites. The Ni-WC composites contained similar phases, however WC dissolution was observed leading to the formation of other carbides. Ni-alloys with low carbon and Cr content exhibited the lowest WC dissolution. The Ni-WC overlays produced using these dilute alloys generally performed better in ASTM G65 wear tests. This was likely due to the reduced dissolution which avoided formation of brittle secondary phases, maintaining a short mean free path between WC particles and allowing increased impact energy absorption.
Language
English
DOI
doi:10.7939/R3HB0Z
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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File title: Abstract
File title: Microstructure and Properties of Ni-Alloy and Ni-WC Composite Overlays
File author: thilan
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