The fracture resistance of experimental alloy and Class U carbon steel wrought railroad wheels
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Mechanical and metallographic testing was used to relate fracture toughness to the mechanical properties and the metallurgical characteristics of Class U carbon steel wrought wheels and an experimental alloy wrought wheel. The study was performed to determine how variations in carbon content and alloy addition influenced these relationships. The results of the research suggest the chromium addition found in the experimental alloy and the variation in prior austenite grain size had little effect on toughness. Carbon content reduction and the resulting amount of proeutectoid ferrite in the microstructure were found to be the principal factors controlling fracture toughness of the wrought steel wheels.
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