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Permanent link (DOI): https://doi.org/10.7939/R3G737H9Q

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Computational Studies on Structure and Mechanical Properties of Carbides in HCCIs Open Access

Descriptions

Other title
Subject/Keyword
simulation
M7C3 carbides
high chromium cast irons
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Cui, Juan
Supervisor and department
Li, Dongyang (Chemical and Materials Engineering)
Examining committee member and department
Nikrityuk, Petr (Chemical and Materials Engineering)
Tang, Tian (Mechanical Engineering)
Li, Dongyang (Chemical and Materials Engineering
Department
Department of Chemical and Materials Engineering
Specialization
Materials Engineering
Date accepted
2017-05-15T09:30:23Z
Graduation date
2017-11:Fall 2017
Degree
Master of Science
Degree level
Master's
Abstract
High Chromium Cast Irons (HCCIs) are widely used in mineral processing, slurry pumping and manufacturing processes, where high resistance to erosion and synergetic erosion-corrosion is required. The excellent performance of HCCIs results from their microstructure, which consists of hard carbides (mainly in hypereutectic HCCI) and ferrous matrix (austenite or martensite ). The matrix helps absorb impact force and enhance toughness of the material, while the hard carbides play a crucial role in withstanding the wearing stress. Due to different processing treatments and chemical compositions, the morphology and mechanical properties of carbides can vary significantly, which affects HCCIs' wear performance. In this study, the effect of core-shell structured carbides on HCCIs' wear performance and the effect of Cr content on M7C3 carbides' mechanical properties are studied by different simulation methods. C++ programming based MSDM method is used to study and optimize the core-shell structured carbides, which have been proved beneficial to HCCIs' wear resistance. By measuring local properties, including Young’s modulus and electron work functions, and conducting first-principles calculations for individual phases, HCCIs' erosion-corrosion performance in slurry are better understood. At last, the correlation between Young's modulus and electron work function is explained by first-principles calculation from an electronic view.
Language
English
DOI
doi:10.7939/R3G737H9Q
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Cui, Juan, et al., A computational study on the benefit of core-shell structured carbides to the erosion resistance of high-Cr cast irons Tribology International, 103 (2016): 432-439  http://www.sciencedirect.com/science/article/pii/S0301679X1630247XJuan
Cui, Liqiu Guo, Hao Lu, D.Y. Li, Understanding effects of Cr content on the slurry erosion behavior of high-Cr cast irons through local property mapping and computational analysis, Wear (2017)

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