凝固速度对高铬铸铁共晶组织的影响  

The Effect of Solidification Rate on Eutectic Microstructure of High Chromium Cast Iron

作　　者：刘春霞[1] 陈建[1] 严文[1] 李浩[2] 范新会[1] 

机构地区：[1]西安工业大学材料与化工学院,西安710032 [2]西北工业大学

出　　处：《西安工业大学学报》2006年第6期578-581,共4页Journal of Xi’an Technological University

基　　金：陕西省教育厅科研专项项目(06JK276);教育部优秀青年教师奖励计划项目[2002]123号文件

摘　　要：采用液态金属冷却的定向凝固技术，获得了在不同凝固速度下的高铬铸铁（Fe-3．35 C-27．5Cr），并研究了凝固速度对高铬铸铁共晶组织的影响规律．结果表明，当温度梯度为150K／cm，凝固速度为1～10μm／s时，固液界面均可维持平直状，可获得M7C3型碳化物呈定向排列的高铬铸铁，碳化物与基体结合牢固，具有原位生长复合材料的效果．By the technique of directional solidification with cooling in liquid metal, the high chromium cast iron （Fe-3.35C-27.5Cr） with different solidification rate has been obtained, and the effect of solidification rate on the eutectic microstructure of high chromium cast iron has been studied. The results show that when the temperature gradient is about 150 K/cm, and solidification rate is 1 to 10μm/s, the solid-liquid interface can be kept in straight, and the high chromium cast iron with directional distribution of M7C3 type carbides can be obtained. The combination between carbides and matrix is quite strong, which is similar to the composite material formed in-situ.

关 键 词：定向凝固 凝固速度 共晶碳化物 共晶组织 

分 类 号：TG257[金属学及工艺—铸造]