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本文研究了铜、锑对球铁机械性能的影响。试验结果表明,铜和锑的最佳加入量分别为0.3-04％Cu和150ppmSb,且工艺简单,能适应一般中小型铸造车间的生产条件。根据江阴柴油机配件厂48包的统计数据,证明铸态球铁的机械性能稳定地达到QT60-2的要求。 对锑在球铁中的行为进行了考察,结果发现,锑在基体中的分布是均匀的,但当锑加入过量时(例如1000ppm)将形成Mg_2Sb_3夹杂物。同时,通过俄歇谱仪分析证实,锑偏析了石墨球和基体界面处,这一锑的偏析层如同一面屏障,在凝固过程中限制了石墨球的长大并使石墨球小而圆整。它也阻止铁素体在石墨球和奥氏体界面处形核,并减慢了碳在奥氏体中的扩散,从而促使奥氏体向珠光体转变。
This paper studies the copper, antimony on the mechanical properties of ductile iron. The test results show that the best addition of copper and antimony were 0.3-04% Cu and 150ppmSb, respectively, and the process is simple, which can adapt to the production conditions of the general small and medium-sized foundry. According to the statistics of 48 bags of Jiangyin Diesel Engine Parts Factory, the mechanical performance of cast ductile iron is proved to meet the requirements of QT60-2 steadily. The behavior of antimony in ductile iron was investigated and it was found that the distribution of antimony in the matrix was uniform, but Mg2Sb3 inclusions were formed when excess antimony was added (for example 1000ppm). At the same time, it is confirmed by Auger spectroscopy analysis that antimony segregates between the graphite ball and the matrix interface. The segregation layer of antimony acts like a barrier, restricting the growth of the graphite ball and making the graphite ball small and round in the solidification process. It also prevents ferrite nucleation at the graphite ball and austenite interface and slows the diffusion of carbon in the austenite, thereby promoting austenite to pearlite transformation.