铸铁中微量元素分布规律的异化及应用

Pb、As、Sn等微量元素在不同形态的石墨区域中有不同的分布规律；在A型石墨区偏聚在基体中，在D型石墨区偏聚在石墨上。利用这两种分布规律，制取含Pb、As、Sn D型石墨铸铁，使Pb、As、Sn主要聚集在石墨上，微量残留在基体中，可以获得良好的力学性能。

Dissimilation of Trace Elements Distribution in Cast Iron and Its Application

The distribution regularities of some trace elements such as Pb,As and Sn in areas of different morphologies of graphite were found different: the trace elements concentrated within the matrix structure in the A-type graphite area;they concentrated, however, on the graphite in the D-type graphite area.Applying these distribution characteristics of trace elements,it is possible to produce Pb,As,Sn -containing D-type graphite cast iron having excellent mechanical properties.The most amount of trace elements in this type of cast iron would concentrate on the graphite and lose their harmful effect, however, a little amount of them would be retained in the matrix structure and have the effect to increase the mechanical properties.