내열 주강 디스크의 마찰특성: 열전도도 영향
Tribological Properties of Heat-resistant Cast Steel Discs: Effect of Thermal Conductivity
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The temperature-dependent tribological properties of brake discs for a train were examined in thisstudy. The discs were produced using heat-resistant alloy steel, which showed different thermal conductivityafter the heat treatments. A commercial brake friction material was used to evaluate the friction effectiveness,and the friction tests were carried out using a 1/5 scale dynamometer under various initial braking temperatureconditions. The results showed that the tribological property of the disc was strongly affected by the heat treatmentschedule. At low temperatures (below 250oC), the friction coefficient increased as a function of disc temperature,indicating that frictional heat increased the adhesion between the disc and pad. In addition, fade wasobserved at high temperatures (above 250oC); it was pronounced in the case of the disc with low thermal conductivity. The different fade resistances observed in the discs with different heat treatment schedules appear tobe influenced by microstructural changes such as carbide redistribution occurring during the heat treatments,which affected the thermal conductivity.
Abstract
The temperature-dependent tribological properties of brake discs for a train were examined in thisstudy. The discs were produced using heat-resistant alloy steel, which showed different thermal conductivityafter the heat treatments. A commercial brake friction material was used to evaluate the friction effectiveness,and the friction tests were carried out using a 1/5 scale dynamometer under various initial braking temperatureconditions. The results showed that the tribological property of the disc was strongly affected by the heat treatmentschedule. At low temperatures (below 250oC), the friction coefficient increased as a function of disc temperature,indicating that frictional heat increased the adhesion between the disc and pad. In addition, fade wasobserved at high temperatures (above 250oC); it was pronounced in the case of the disc with low thermal conductivity. The different fade resistances observed in the discs with different heat treatment schedules appear tobe influenced by microstructural changes such as carbide redistribution occurring during the heat treatments,which affected the thermal conductivity.
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