化学成分对球墨可锻铸铁石墨化的影响

Influence of Chemical Composition on Graphitization of Spheroidal Graphite Malleable

本文利用测量石墨化膨胀的方法和OMNICOM图像分析仪,研究了化学成分对球墨可锻铸铁高温和低温石墨化的影响。结果表明,碳对球墨可锻铸铁第一阶段石墨化的影响不同于可锻铸铁,碳量增加有利于第二阶段石墨化;硅对其高温和低温石墨化有显著影响;当Re、Mg残留量小于0.09～0.10％时,第一阶段石墨化时间随其含量提高而降低,但是,Re、Mg超过0.10％后,石墨化时间又提高,Re、Mg量提高阻碍第二阶段石墨化;加入AI、Bi后;其退火石墨数增加,退火时间缩短。

In this article, the influence of chemical composition on both high and low temperature graphitization of spheroidal graphite malleable is investigated by the use of method of mea-suring graphitization expansion and OMNICOM-type image analyzing instrument. Results show that influence of carbon on first stage graphitization of spheroidal graphite malleable is differnt from malleable and the increasing of carbon is favorable for second stage graphitiza-tion; silicon influences remarkablely on the graphitization at high and low temperature. when RE, Mg residual is less than 0.09-0.10%, the graphitization time of the first stage is re-duced as its content increased, but the time of graphitization is extended when RE、Mg is greater than 0.10%, increasement of RE, Mg impedes scecond stage graphitization; after adding Al and Bi, the counts of annealing graphite increased and annealing time reduced.