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The microstructure of cast iron brake disc (enlarged ×100): a -not etched; b -etched.
Source publication
The features of graphite formation in hypoeutectic and hypereutectic gray cast iron are considered. It is shown that this process in hypoeutectic gray cast irons is easier to control than in hypereutectic, because the formation of a predominantly rectilinear uniformly distributed graphite with a smaller size range and the presence of other distribu...
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Citations
... The core hardness of the Disc 1 material was lower than that of the Disc 2 material. In principle, with the same brake pads, Disc 1 would suffer from poorer wear resistance than Disc 2 [19][20][21][22][23][24][25]. ...
The brake system of Melbourne’s High-Capacity Metro Train (HCMT) suffers from consistently extended braking distances after repeating a set of high-speed tests and the commission process. The degradation of brake system performance affects the safety of rolling stock and its conformance to the design standard. In this paper, the root cause leading to the degraded brake performance was analyzed. The brake discs and brake pads of the affected train and another train with normal working conditions were removed and a series of examinations was to determine the reason for the change of friction coefficient between friction surfaces. The results revealed that brake disc samples from the affected TS02 trainset suffered from changed transfer film and surface morphology after multiple consecutive high-speed braking applications. The factors that may affect the brake system performance were analyzed in the laboratory. It was found the brake disc surface had a lower hardness level, coefficient of friction, and smaller contacting area with the brake pad when compared to the brake disc and pad samples from another trainset. These factors harmed the performance of the braking system, and the decrease in the braking effort led to a longer braking distance than expected and failed braking tests.
... These are caused by the high contact pressures (up to 10 MPa) and intense frictional heating (up to 600 ° C), regarding dry abrasive friction [1][2][3][4]. An obstacle to further optimization of the materials in the manufacture of the "brake disc -pad" pair is the lack or insufficient information on the influence of the composition and technological factors on the operational properties of the friction pair parts, as well as the information on the mechanisms of friction and wear in the "brake disc -pad" pair [5][6][7][8][9]. ...
Wear and crack resistance are important operational characteristics of brake discs. The paper presents the most optimal concentration of sulfur in cast iron, which ensures its least wear, and discusses the implementation of the front brake discs manufacture from Gh190 cast iron having 0.11 ... 0.13% sulfur content at contrast to the 0.01 ... 0.03% sulfur content, and proves the change leads to a significant increase in wear and frictional properties of the discs. In the course of research, it is found that the increase in the crack resistance of brake discs is possible due to the improvement of the thermophysical properties of cast iron with the increase in the carbon content (up to 3.55 ... 3.60%) and the decrease in the silicon content (up to 1.45 ... 1.50%), while the carbon equivalent is constant.
