【摘要】 通过对失效汽车制动鼓的分析,发现普通灰铸铁制动鼓的材料强度、硬度较低,易出现磨损严重或热疲劳裂纹情况,已不能满足现在汽车高负荷、高速度的要求。由于石墨具有高的热传导性,采用高C铸铁将会改善抗热疲劳性,但石墨的增加会使铸件强度下降,在高C合金中加入合金元素(Cr、Mo、Cu、Sn等)可使铸件强度和抗热疲劳性等性能得到兼顾,从而使制动鼓的使用寿命得到大幅度提高。更多还原

【Abstract】 Through the failure analysis of automotive brake drum,it was found that common gray cast iron has low strength and hardness,occurs easily severe wear or thermal fatigue crack,can not satisfy the requirement of high load and high speed automobiles.Because of the high thermal conductivity of graphite,high carbon cast iron can improve the thermal fatigue resistance,whereas the strength of cast iron decreases with the increase of carbon content,adding alloy element such as Cr ?Mo ?Cu?Sn,etc,the castings with both high strength and high thermal fatigue resistance can be obtained,and the life of brake drum can be improved remarkably.更多还原