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Thermal fatigue and wear of compacted graphite iron brake discs with various thermomechanical properties
Time:2024-07-24   Hits:40

Title: Thermal fatigue and wear of compacted graphite iron brake discs with various thermomechanical properties

DOI: https://doi.org/10.1007/s41230-024-4009-6

Author: *Gui-quan Wang, Zhuo Xu, Zhong-li Liu, Xiang Chen, and Yan-xiang Li

Corresponding author: 

*Gui-quan Wang

Male, born in 1985, Ph. D. His research interests mainly focus on the cast alloying materials.

E-mail: wgq19@ytu.edu.cn

Abstract: 

The increase in payload capacity of trucks has heightened the demand for cost-effective yet high performance brake discs. In this work, the thermal fatigue and wear of compacted graphite iron brake discs were investigated, aiming to provide an experimental foundation for achieving a balance between their thermal and mechanical properties. Compacted graphite iron brake discs with different tensile strengths, macrohardnesses, specific heat capacities and thermal diffusion coefficients were produced by changing the proportion and strength of ferrite. The peak temperature, pressure load and friction coefficient of compacted graphite iron brake discs were analyzed through inertia friction tests. The morphology of thermal cracks and 3D profiles of the worn surfaces were also discussed. It is found that the thermal fatigue of compacted graphite iron discs is determined by their thermal properties. A compacted graphite iron with the highest specific heat capacity and thermal diffusion coefficient exhibits optimal thermal fatigue resistance. Oxidization of the matrix at low temperatures significantly weakens the function of alloy strengthening in hindering the propagation of thermal cracks. Despite the reduced hardness, increasing the ferrite proportion can mitigate wear loss resulting from low disc temperatures and the absence of abrasive wear.

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