电脉冲处理脉宽对亚共晶铁碳合金中石墨的影响  

Influence of Pulse Width of Electric Current Pulse on Graphite of Hypoeutectic Fe-C Alloys

作　　者：黄正阳[1] 岑启宏[1,2] 黎振华[1] 武颖[1] 邹磊[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]固体废弃物资源化国家工程研究中心,云南昆明650033

出　　处：《热加工工艺》2014年第15期50-53,共4页Hot Working Technology

基　　金：国家自然科学基金面上项目(51171073);高等学校博士学科点专项科研基金项目(20115314120002)

摘　　要：研究了不同脉宽的电脉冲(ECP)处理对亚共晶铁碳合金中石墨的影响。结果表明,ECP处理能使石墨分布更加均匀、细小,石墨的形核率增加。随着ECP处理脉宽的增大,石墨的形核率进一步增加,石墨也随之细化。分析表明,ECP处理可以增加石墨的形核位置,降低碳原子在奥氏体中的扩散激活能和形核势垒,并缩短石墨的形核孕育期,从而提高了石墨的形核率。The influences of electric current pulse （ECP） with different pulse widthes on the graphite of hypoeutectic Fe-C alloys were researched. The results show that ECP treatment can make graphite distribute more uniform and fine. It can also enhance the nucleation rate of graphite. The graphite nucleation rate further increases with the pulse width increasing, and graphite also refines. The analysis shows that ECP treatment can increase the nucleation sites of graphite, decrease the diffusion activation energy and nucleation barrier, and shorten nucleation incubation period of graphite. Thus, the nucleation rate of graphite is increased.

关 键 词：铁碳合金 电脉冲 脉宽 石墨形核率 

分 类 号：TG250[金属学及工艺—铸造]