Effect of Alloying Elements on Thermal Diffusivity of Gray Cast Iron Used in Automotive Brake Disks |
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Authors: | O Maluf M Angeloni DBV Castro WW Bose Filho D Spinelli COFT Ruckert |
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Affiliation: | 1. Materials, Aeronautics and Automotive Engineering Department, Engineering School of S?o Carlos, University of S?o Paulo, S?o Paulo, Brazil
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Abstract: | The purpose of this work was to experimentally investigate the thermal diffusivity of four different gray cast iron alloys,
regularly used to produce brake disks for automotive vehicles. Thermal diffusivity measurements were performed at temperatures
ranging from room temperature to 600 °C. The influence of the thermal conductivity on the thermomechanical fatigue life is
also briefly presented. The measurements were sensitive to the influence of the carbon equivalent and alloying elements, such
as molybdenum, copper and chromium. Molybdenum, unlike copper, lowered the thermal diffusivity of the gray cast iron, and
alloy E (without molybdenum), besides presenting a relatively low carbon equivalent content and an increase in the values
of the thermal diffusivity, presented the best performance during the thermomechanical fatigue. The molybdenum present in
alloys B and C did not fulfill the expectations of providing the best thermomechanical fatigue behavior. Consequently, its
elimination in the gray cast iron alloy for this application will result in a significant economy. |
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