凝固速度对Fe-Cr-C原位生长复合材料定向凝固组织的影响  

Effect of Solidification Rate on the Microstructure of Fe-Cr-C Composites Formed in Situ

作　　者：陈建[1] 严文[1] 苗健[1] 李浩[2] 范新会[1] 

机构地区：[1]西安工业学院材料与化工学院,陕西西安710032 [2]西北工业大学应用物理系,陕西西安710072

出　　处：《铸造技术》2006年第2期131-134,共4页Foundry Technology

摘　　要：采用液态金属冷却的定向凝固设备，研究了凝固速度对3．35％C-27．5％Cr高铬铸铁原位生长复合材料定向凝固组织的影响。结果表明，该合金成分在温度梯度为150K／cm，凝固速度为1～10μm／s时，成功制备出Fe-Cr-C原位生长复合材料;凝固速度较高时初生M7C3型碳化物为空心或实心的六边形，随着凝固速度的降低，出现了U形和L形M7C3型碳化物；共晶M7C3型碳化物虽然大体上比较规则，但在其精细结构的形貌上出现许多分又，而且随凝固速度的增加，碳化物分又现象越显著。It was studied that the effect of solidification rate on the solidification structure of high chromium cast iron with the composition of Fe-3.35%C-27.5%Cr, by unidirectional solidification of liquid metal cooling with directional contribution of carbides formed in situ. The results show when the temperature gradient at the solidification front is about 150 K/cm and solidification rate is in the range of 1 and 10 μm/s, Fe-Cr-C in situ composites can be manufactured successfully. The morphology of primary phase M7C3-type carbides cross section is hexagonal and hollow hexagonal at the high solidification rate, and with decrease of solidification rate, the morphology of primary phase cross section tends to be in U and L shape. Although the morphology of eutectic carbide M7C3 is relatively regular, the detailed structure of the eutectic carbides forms many branches, and with the increase of solidification rate, branching will become more remarkable.

关 键 词：定向凝固 凝固速度 初生相 共晶碳化物 

分 类 号：TB331[一般工业技术—材料科学与工程]