第36卷第2期 北京科技大学学报 Vol.36 No.2 2014年2月 Journal of University of Science and Technology Beijing Feb.2014 脉冲电流参数对过共晶高铬铸铁近液相线熔化后凝固 组织的影响 陈 华2)，周荣锋)四，张玲”，周荣” 1)昆明理工大学材料科学与工程学院，昆明6500932)昆明理工大学机电工程学院，昆明650504 3)昆明理工大学分析测试研究中心，昆明650093 ☒通信作者，E-mail:zhourfchina(@hotmail.com 摘要对过共晶高铬铸铁近液相线溶化后的凝固过程进行脉冲电流处理，研究了脉冲电流参数（脉冲电压和频率）对凝固 组织的影响.发现脉冲频率和电压的增大都有助于过共晶高铬铸铁凝固组织中碳化物的细化和粒化.脉冲频率的增大促进 大量细小颗粒状初生碳化物的析出，离异共晶现象变得更加明显，层片状共晶碳化物减少.脉冲电压的增加促进初生碳化物 细化和粒化，片状共晶碳化物变短.过高的电压也促进离异共晶，导致更多的初生碳化物的形成. 关键词铸铁：脉冲电流：凝固：组织：碳化物：晶粒细化：粒化 分类号TG143.7 Effect of electric current pulse parameters on the solidification microstructure of hypereutectic high-chromium cast iron near-liquidus melted CHEN Hua,ZHOU Rong feng ZHANG Ling,ZHOU Rong 1)School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China 2)School of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming 650504,China 3)Research Center of Analysis and Test,Kunming University of Science and Technology,Kunming 650093,China Corresponding author,E-mail:zhourfchina@hotmail.com ABSTRACT Solidification of hypereutectic high-chromium cast iron samples near-liquidus melted was treated with electric current pulse (ECP).The effects of ECP parameters such as electric voltage and pulse frequency on the solidification microstructure were in- vestigated during the treatment.It is found that increasing the pulse frequency or electric voltage is helpful to carbide refinement and granulation in the cast iron.The increase of pulse frequency promotes the precipitating of a large number of fine granular primary car- bides and the occurrence of a divorced eutectic reaction,which lead to the decrease in number of lamellar eutectic carbides.The in- crease of electric voltage contributes to the primary carbides refining and granulating as well as the lamellar eutectic carbides shorten- ing.An excessive voltage value can also be favorable to the occurrence of a divorced eutectic reaction and the formation of additional primary carbides KEY WORDS cast iron:electric current pulse:solidification:microstructure;carbides;grain refinement:granulation 高铬铸铁因组织中存在大量M,C,型碳化物有 高铬铸铁.对于过共晶高铬铸铁，由于出现粗大的 力地增强了材料的磨损抗力，在治金、矿山、水泥、电 长杆状初生碳化物，导致其韧性急剧下降，从而降低 力、煤炭等领域承受高温、腐蚀、冲击和冲刷磨损的 其使用寿命，若能使碳化物数量进一步增加但又使 过流工况下被广泛应用).目前常用的是亚共晶 其不以粗大的碳化物形态出现，这样不仅可改善冲 收稿日期：2012-1208 基金项目：国家自然科学基金资助项目(51261011)：云南省平台建设项目(2010DH025):云南省人才培养基金资助项目(2009C024) DOI:10.13374/j.issn1001-053x.2014.02.006:http://journals.ustb.edu.cn第 36 卷 第 2 期 2014 年 2 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 No． 2 Feb． 2014 脉冲电流参数对过共晶高铬铸铁近液相线熔化后凝固 组织的影响 陈 华1，2) ，周荣锋1，3) ，张 玲1) ，周 荣1) 1) 昆明理工大学材料科学与工程学院，昆明 650093 2) 昆明理工大学机电工程学院，昆明 650504 3) 昆明理工大学分析测试研究中心，昆明 650093  通信作者，E-mail: zhourfchina@ hotmail． com 摘 要 对过共晶高铬铸铁近液相线溶化后的凝固过程进行脉冲电流处理，研究了脉冲电流参数( 脉冲电压和频率) 对凝固 组织的影响． 发现脉冲频率和电压的增大都有助于过共晶高铬铸铁凝固组织中碳化物的细化和粒化． 脉冲频率的增大促进 大量细小颗粒状初生碳化物的析出，离异共晶现象变得更加明显，层片状共晶碳化物减少． 脉冲电压的增加促进初生碳化物 细化和粒化，片状共晶碳化物变短． 过高的电压也促进离异共晶，导致更多的初生碳化物的形成． 关键词 铸铁; 脉冲电流; 凝固; 组织; 碳化物; 晶粒细化; 粒化 分类号 TG 143. 7 Effect of electric current pulse parameters on the solidification microstructure of hypereutectic high-chromium cast iron near-liquidus melted CHEN Hua1，2) ，ZHOU Ｒong-feng1，3)  ，ZHANG Ling1) ，ZHOU Ｒong1) 1) School of Materials Science and Engineering，Kunming University of Science and Technology，Kunming 650093，China 2) School of Mechanical and Electrical Engineering，Kunming University of Science and Technology，Kunming 650504，China 3) Ｒesearch Center of Analysis and Test，Kunming University of Science and Technology，Kunming 650093，China  Corresponding author，E-mail: zhourfchina@ hotmail． com ABSTＲACT Solidification of hypereutectic high-chromium cast iron samples near-liquidus melted was treated with electric current pulse ( ECP) ． The effects of ECP parameters such as electric voltage and pulse frequency on the solidification microstructure were in￾vestigated during the treatment． It is found that increasing the pulse frequency or electric voltage is helpful to carbide refinement and granulation in the cast iron． The increase of pulse frequency promotes the precipitating of a large number of fine granular primary car￾bides and the occurrence of a divorced eutectic reaction，which lead to the decrease in number of lamellar eutectic carbides． The in￾crease of electric voltage contributes to the primary carbides refining and granulating as well as the lamellar eutectic carbides shorten￾ing． An excessive voltage value can also be favorable to the occurrence of a divorced eutectic reaction and the formation of additional primary carbides． KEY WOＲDS cast iron; electric current pulse; solidification; microstructure; carbides; grain refinement; granulation 收稿日期: 2012--12--08 基金项目: 国家自然科学基金资助项目( 51261011) ; 云南省平台建设项目( 2010DH025) ; 云南省人才培养基金资助项目( 2009CI024) DOI: 10． 13374 /j． issn1001--053x． 2014． 02． 006; http: / /journals． ustb． edu． cn 高铬铸铁因组织中存在大量 M7C3型碳化物有 力地增强了材料的磨损抗力，在冶金、矿山、水泥、电 力、煤炭等领域承受高温、腐蚀、冲击和冲刷磨损的 过流工况下被广泛应用［1--3］． 目前常用的是亚共晶 高铬铸铁． 对于过共晶高铬铸铁，由于出现粗大的 长杆状初生碳化物，导致其韧性急剧下降，从而降低 其使用寿命，若能使碳化物数量进一步增加但又使 其不以粗大的碳化物形态出现，这样不仅可改善冲