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- Title
Thermal fatigue and wear of compacted graphite iron brake discs with various thermomechanical properties.
- Authors
Gui-quan Wang; Zhuo Xu; Zhong-li Liu; Xiang Chen; Yan-xiang Li
- 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.
- Subjects
THERMAL fatigue; THERMOMECHANICAL properties of metals; DISC brakes; GRAPHITE; SPECIFIC heat capacity
- Publication
China Foundry, 2024, Vol 21, Issue 3, p248
- ISSN
1672-6421
- Publication type
Article
- DOI
10.1007/s41230-024-4009-6