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Effect of Carbon Equivalent on Thermal Conductivity of Titanium-Alloyed Gray Cast Iron

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Abstract:

Gray iron remains the dominant material for automotive brake discs due to its excellent thermal conductivity, wear resistance, castability, and cost-effectiveness. To enhance its performance, this study investigates the effect of varying carbon equivalent (CE) on the thermal conductivity of titanium-alloyed gray iron. Four compositions with CE ranging from 3.89 to 4.77 were cast and analyzed. Microstructural examination revealed a transition from hypoeutectic to hypereutectic structures, with increasing graphite size and reduced dendritic austenite as CE increased. Thermal conductivity measurements, conducted using the Hot Disk Thermal Constant Analyzer, showed that higher CE improved thermal conductivity, attributed to the presence of larger graphite flakes and reduced primary austenite. These results indicate that optimizing CE in Ti-alloyed gray iron can significantly enhance heat dissipation in brake discs, offering improved performance without substantial cost increases.

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Periodical:

Materials Science Forum (Volume 1196)

Pages:

195-200

DOI:

https://doi.org/10.4028/p-0ZuSV1

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Online since:

June 2026

Authors:

Kittirat Worakhut, Worachot Boonyarit, Sirintra Mangmee, Wachira Hansongkhram, Tanaporn Soipornmat, Hathaichanok Khochadklang, Panya Buahombura, Sarum Boonmee*

Keywords:

Brake Disc, Cast Iron, Gray Iron, Thermal Conductivity, Titanium

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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