冷却速率及钛元素对过共晶高铬铸铁微观组织的影响  

Effect of Cooling Rate and Ti Element on Microstructure of Hypereutectic High Chromium Cast Iron

作　　者：周向葵 刘建秀 吴深 高红霞 ZHOU Xiangkui;LIU Jianxiu;WU Shen;GAO Hongxia(Henan Key Laboratory of Intelligent Manufacturing of Mechanical Equipment,Zhengzhou University of Light Industry,Zhengzhou 450002,China)

机构地区：[1]郑州轻工业大学河南省机械装备智能制造重点实验室,河南郑州450002

出　　处：《热加工工艺》2020年第22期153-155,共3页Hot Working Technology

基　　金：郑州轻工业学院博士启动基金资助项目(2016BSJJ011)。

摘　　要：通过提高冷却速度和添加Ti合金元素配合的方法来细化过共晶高铬铸铁的初生碳化物相,研究了冷却速度和Ti元素对过共晶高铬铸铁微观组织的影响。研究表明,在合金凝固过程中,随着冷却速率的增大,初生碳化物逐渐细小,但大的冷却速率不能改变先共晶碳化物的块体形貌。在过共晶高铬铸铁中添加合金元素Ti,可以在凝固过程中形成作为M7C3相形核的核心TiC2,提高形核率,细化先共晶碳化物相。The primary carbide phase of hypereutectic high chromium cast iron was refined by increasing the cooling rate and adding Ti element to refine the primary carbide phase of hypereutectic high chromium cast iron. The effects of cooling rate and Ti element on the microstructure of hypereutectic high chromium cast iron were studied. The results show that, the primary carbides are finer with the increase of cooling rate in the solidification process of the alloy. However, the large cooling rate can not change the bulk morphology of eutectic carbides. The addition of alloy element Ti to hypereutectic high chromium cast iron can form the core TiC2 as the nucleation of M7C3 phase during solidification to improve the nucleation rate and refine the pre-eutectic carbide phase.

关 键 词：过共晶高铬铸铁 冷却速率 初生碳化物 微观组织 

分 类 号：TG156.1[金属学及工艺—热处理] TG143.7[金属学及工艺—金属学]