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Effects of cooling rate on vermicular graphite percentage in a brake drum produced by onestep cored wire injection

China Foundry 2015年第5期12卷 349-353页

作者： Yu-shuang Feng Ze-sheng Ji He-sheng Wu Yong-cheng Feng School of Materials Science and Engineering Harbin University of Science and Technology Harbin Kedewei Metallurgy Co. Ltd. Shandong Ductile Iron Pipes Co. Ltd.

In this research, a vermicular graphite cast iron brake drum was produced by cored wire injection in a one-step method. Silica sand and low-density alumina-silicate ceramic were used as molding materials in order to investigate the effect of cooling rate on percentage of vermicular graphite and mechanical properties of the brake drum casting. Several thermocouples were inserted into the casting in the desired positions to measure the temperature change. By means of one-step cored wire injection, the two residual concentrations of Mg and RE were effectively controlled in the ranges of 0.013%-0.017% and 0.019%-0.025%, respectively, which are crucial for the production of vermicular graphite cast iron and the formation of vermicular graphite. In addition, the cooling rate had a significant effect on the vermicular graphite percentage. In the case of the silica mold brake drum casting, there was an obvious difference in the cooling rate with the wall change, leading to a change in vermicular graphite percentage from 70.8% to 90%. In the low-density alumina-silicate ceramic mold casting, no obvious change in temperature was detected by the thermocouples and the percentage of the vermicular graphite was stable at 85%. Therefore, the vermicular graphite cast iron brake drum with a better combination of mechanical properties could be obtained.

关键词： cored wire injection in one-step vermicular graphite cast iron cooling rate vermicular graphite percentage brake drum

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