February 1, 2015 Thesis Open Access

Asmamaw Dagne

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    <subfield code="a">A Thesis Submitted to the School of Mechanical and Industrial Engineering in Partial Fulfillment of the Requirements for the Degree of Masters of Science in Railway Engineering</subfield>
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    <subfield code="a">&lt;p&gt;Wheel and rail is one of the most important material used to support and guide rail vehicle safely&lt;br&gt;
and smoothly. Since wheel and rail suffers from various interacting mechanical and thermal&lt;br&gt;
forces, friction modifiers, various contaminants and environmental atmosphere, wear poses large&lt;br&gt;
problem on wheel and rail.&lt;br&gt;
Wheel and rail wear can be result in an extensive cost for truck owner, if it is not predicated and&lt;br&gt;
prevented in an efficient way. To limit these costs, one measure is to predicate and prevent wheel&lt;br&gt;
and rail wear through wear modeling.&lt;br&gt;
The purpose of this research is to investigate the influence of heat treating both wheel and rail at&lt;br&gt;
the same time on rolling/sliding wear of wheel and rail.&lt;br&gt;
The rolling/sliding wear of three pair of rollers used to model wheel and rail material is studied&lt;br&gt;
using twin disc rolling/sliding wear testing machine. The three pair of rollers used in this study is&lt;br&gt;
manufactured from carbon steel having similar hardness and chemical composition as that of&lt;br&gt;
standard wheel and rail. Then the two pair of rollers is heat treated in an electric furnace to&lt;br&gt;
improve their hardness. Heat treatment was done by heating the rollers to austenite temperature,&lt;br&gt;
holding at that temperature for 45minutes for uniform temperature distribution. Water or air plus&lt;br&gt;
oil are used as cooling median.&lt;/p&gt;</subfield>
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