石墨蠕化率对蠕墨铸铁受热变形趋势的影响

通过模拟蠕墨铸铁制动受热变形试验,采用薄片试样,模拟列车蠕墨铸铁制动盘使用时的受力情况,设计受热变形试验工装,给予试样两端一个相同的、较小的变形量(弹性变形范围内),模拟列车制动工况温度150℃,加热保温30 h,自然冷却后,在自由状态下测量试样的永久变形量,对试验数据进行统计分析,通过重复做多组试验来研究不同石墨蠕化...

Effect of graphite creep rate on thermal deformation

The thermal deformation test of vermicular graphite cast iron brakes was simulated: the thin specimens were used to simulate the stress condition of train vermicular graphite cast iron brake discs in service; the thermal deformation test tooling was designed to ensure an identical and small amount of deformation (within the range of elastic deformation) on both ends of specimen; the simulation temperature for the train braking condition was 150 ℃, and the heating and holding period was 30 h; after natural cooling, the permanent deformation amount of the sample in a free state was measured. The statistical analysis of the test data was performed. Several sets of experiments were repeated to investigate the effect of different graphite creep rates (35%, 50%, 70% and 90%) on the thermal deformation of vermicular graphite cast iron. The results showed that when the graphite creep rate was in range of 35% 90%, the thermal deformation tendency of vermicular graphite cast iron increased with the increase of the creep rate.