不同成分灰铸铁制动盘的性能研究

Study on Performance of Gray Cast Iron Brake Disc with Different Compositions

以制动盘用高碳当量灰铸铁和普通灰铸铁为研究对象,通过扫描电镜和DSC热分析仪,研究两种灰铸铁的断口形貌、切削加工性能及导热性能。结果表明,高碳当量灰铸铁和普通灰铸铁拉伸试样的断裂方式均为解理断裂和沿晶断裂复合机制,其中高碳当量灰铸铁穿晶解理断面较大;机加工后高碳当量灰铸铁表面粗糙度为0.4,普通灰铸铁表面粗糙度为1.18,高碳当量灰铸铁的加工刀具磨损程度更小,加工性能更好;对比分析DSC曲线,高碳当量灰铸铁的共析和共晶转变峰值高于普通灰铸铁,导热性能更好。

The fracture morphology, machinability and thermal conductivity of high carbon equivalent gray cast iron and common gray cast iron for brake disc were studied by SEM and DSC thermal analyzer. The results show that the fracture modes of tensile samples of high carbon equivalent gray cast iron and ordinary gray cast iron are the combined mechanism of cleavage fracture and intergranular fracture. After machining, the surface roughness of high carbon equivalent gray cast iron is 0.4, and that of ordinary gray cast iron is 1.18. High carbon equivalent gray cast iron has lower tool wear and better machining performance. DSC curves show that the eutectoid and eutectic transition peaks of high carbon equivalent gray cast iron are higher than that of ordinary gray cast iron, and the thermal conductivity is better.