废旧轮胎内钢丝对合成灰铸铁制动盘性能的影响

介绍了采用不同配比的废旧轮胎内钢丝和回炉料作为主要原材料,使用增碳剂进行增碳,使用75硅铁孕育剂和硅钡钙铝长效孕育剂进行随流孕育,并加入Cr、Cu等合金元素进行组织强化。在相同铸造工艺下,制备化学成分基本相同的灰铸铁制动盘和准30 mm的单铸试棒,然后对试件的金相组织、硬度、抗拉强度进行检测分析。结果表明,不同的原材料配比对金相组织中的石墨的类型、长度以及珠光体的片间距有着较大的影响,珠光体含量未发生明显变化;对硬度和抗拉强度影响较大,当废旧轮胎内钢丝的加入比例由70%变为80%时,抗拉强度与硬度变化明显。随着废旧轮胎内钢丝的比例不断增加,A型石墨的比例不断升高,由93.7%增长至99.2%;珠光体含量由95.3%增长至99.1%,珠光体石墨与珠光体逐渐细化,抗拉强度及硬度逐渐升高,满足了高性能制动盘的性能要求。

Effect of Scrap Tire Inner Steel Wire on Performance of Synthetic Gray Cast Iron Brake Disc

The steel wire inside waste tires and the return charge of different ratio were used as the main raw materials, the carburizing agent was used for carburizing, 75 ferrosilicon inpregnant agent and Si-Ba-Ca-Al long-acting inpregnant agent were used for in-stream inpregnant, and Cr, Cu and other alloy elements were added for microstructure strengthening.Under the same casting process, the preparation of basically the same chemical composition of gray cast iron brake disc and Φ 30 mm single cast test bar, then the microstructure, hardness, tensile strength of the specimens for detection analysis. The results show that different ratio of raw materials has a great influence on the type, length and sheet spacing of pearlite, and the pearlite content does not change significantly. The influence on the hardness and tensile strength is great,when the proportion of steel wire in the waste tire is changed from 70% to 80%, the change of tensile strength and hardness is obvious. With the increase of the proportion of steel wire in waste tires, the proportion of A-type graphite increases from 93.7% to 99.2%. Pearlite content increased from 95.3% to 99.1%, pearlite graphite and pearlite gradually refined, tensile strength and hardness gradually increased, meeting the performance requirements of high-performance brake disc.