Nb含量对过共晶高铬铸铁微观组织和力学性能的影响  

Effect of Nb Content on Microstructure and Mechanical Properties of Hypereutectic High Chromium Cast Iron

作　　者：周向葵 王艳 吴深[1] 肖志玲 ZHOU Xiangkui;WANG Yan;WU Shen;XIAO Zhiling(Henan Key Laboratory of Mechanical Equipment Intelligent Manufacturing,Zhengzhou University of Light Industry,Zhengzhou 450002,China)

机构地区：[1]郑州轻工业学院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》2022年第20期50-52,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：通过添加Nb元素来细化过共晶高铬铸铁中的初生碳化物。研究了在空冷条件下Nb含量对过共晶高铬铸铁组织及性能的影响。结果表明,添加Nb元素可在合金中先形成Cr_(2)Nb,并作为M_(7)C_(3)相形核的核心,提高M_(7)C_(3)的形核率,显著细化过共晶高铬铸铁中的初生碳化物,提高过共晶高铬铸铁的硬度。Nb添加量为1.5%时,试样硬度达到86.5 HRC。The primary carbide in hypereutectic high chromium cast irons(HCCIs)was refined by the addition of Nb during air cooling,and the influences of Nb content on the microstructure and mechanical properties of hypereutectic HCCIs in cooling condition were investigated.The results show that Cr_(2)Nb forms firstly in the alloy by Nb addition during the solidification process,increase nucleation rate and refine the proeutectic carbide,then increase the hardness of Nb contained hypereutectic HCCIs.The hardness reaches 86.5 HRC,when 1.5%Nb content is added.

关 键 词：过共晶高铬铸铁 合金化 初生碳化物 性能 

分 类 号：TG156.88[金属学及工艺—热处理]