变温条件下石墨形态对缸套铸铁磨损性能的影响

Effect of graphite morphology on wear performance of cylinder liner cast iron under variable temperature

为了研究缸套铸铁材料石墨形态对其磨损过程的影响,选取了灰铸铁、蠕墨铸铁和球墨铸铁3种具有不同石墨形态的铸铁材料为研究对象,分别在不同温度下对其进行了干摩擦磨损实验。结果表明:灰铸铁的摩擦系数及磨损量随温度的上升而上升,而蠕墨铸铁及球墨铸铁随温度的上升呈现先上升后下降的变化趋势;常温下灰铸铁的摩擦系数及磨损量最大,耐磨性能最差;高温时灰铸铁的摩擦系数及磨损量仍然最大,蠕墨铸铁的摩擦系数大于球墨铸铁,但磨损量最小,耐磨性能最优。

In order to study the effect of graphite morphology on wear process of cylinder liner cast iron,three cast iron materials with different graphite morphology,gray cast iron,vermicular graphite cast iron and ductile cast iron,were selected as the research objects,and the dry friction and wear experiments of the three cast iron materials were carried out at different temperatures.The results show that with the increase of the temperature,the friction coefficient and the wear mass loss of the gray cast iron increase,while the friction coefficient and the wear mass loss of the vermicular cast iron and the ductile cast iron increase first and then decrease.The friction coefficient and the wear mass loss of the gray cast iron at room temperature are the largest and the wear resistance is the worst;the friction coefficient and wear mass loss of the gray cast iron at high temperature are still the largest,and the friction coefficient of the vermicular cast iron is larger than that of the ductile cast iron,but the wear mass loss is the smallest and the wear resistance is the best.