초록 열기/닫기 버튼
A pin-on-disk test is performed to measure the wear volume of a ductile cast iron (DCI) roll when it wears down using a high carbon steel and two alloy steels at different sliding velocities between the roll and the material (steel). Normal pressure is set as constant and test temperatures are 400, 500 and 600 oC. In addition, thermal softening behavior of the DCI roll is examined using a high-temperature micro-hardness tester and the surface hardness variation of the DCI roll is expressed in terms of temperature and heating time. Based on experimental data, a wear coefficient used in Archard’s wear model for each material is obtained. The wear volume is clearly observed when the test temperature is 400 oC and sliding velocity varies. However, it is not measured at temperatures of 500 oC and 600oC even with variations in sliding velocity. From the optical photographs of the pin and disk, the abrasive wear is observed at 400 oC clearly, but no at 500 oC and 600 oC. At higher temperatures, the pin surface is not smooth and has many tiny caves distributed on it. It is found that wear volume is dependent on the carbon contents rather than alloy contents. Results also reveal that the variations of wear coefficients are almost linearly proportional to the carbon contents of the material.
키워드열기/닫기 버튼
wear coefficient, archard wear model, thermal softening, wear volume, ductile cast iron roll
