脉冲电流对过共晶灰口铸铁凝固组织的影响  

Effect of Pulse Electric Current on Solidification Structure of Hypereutectic Gray Cast Iron

作　　者：范金辉[1] 李仁兴[1] 华勤[1] 李祖齐[1] 富知愚[1] 翟启杰[1] 

机构地区：[1]上海大学材料科学与工程学院

出　　处：《钢铁研究学报》2004年第5期59-62,共4页Journal of Iron and Steel Research

基　　金：上海市重大基础研究项目(01JC14001)

摘　　要：采用储能电容为1200μF的脉冲电源,在不同的充电电压下,对过共晶灰口铸铁进行电脉冲处理。结果表明:脉冲电流能够明显细化和改善过共晶灰口铸铁的凝固组织,使石墨由粗大的长片状变为小块状或小片状,石墨的分布更加均匀,而且尖角钝化甚至呈近似球形。脉冲电压的升高和脉冲频率的增大都有利于过共晶灰口铸铁凝固组织的细化和改善。Using a pulse electrical source with 1 200 μF storage capacitance, under different charge voltages, the hypereutectic gray cast iron was treated with pulse electrical current. The results show that the pulse electric current can greatly refine and improve solidification structure of hypereutectic gray cast iron, and graphite morphology is transformed from long flake to little block and fine flake, and the distribution of graphite become more uniform. Moreover, the acute angle of graphite flake become duller, even spheric approximately. The increase of pulse voltage and pulse frequency is beneficial to refinement and improvement of solidification structure of hypereutectic gray cast iron.

关 键 词：咏冲电流 灰口铸铁 凝固 组织 

分 类 号：TG251[金属学及工艺—铸造]