摘要
本文研究了合金元素Nb对15-3型高铬铸铁组织性能的影响。试验结果表明,Nb主要与C结合形成NbC,高铬铸铁基体嵌上硬度更高(HV_(0·1) 24000MPa)的NbC对抗磨粒磨损更有效。在铁水凝固过程中弥散的NbC颗粒为M_7C_3型Fe、Cr复合碳化物的形核提供外来核心,并阻碍其生长导致组织细化,Nb的加入改善了高铬铸铁的综合性能,特别是含Nb的过共晶高铬铸铁,韧性不会明显下降,在低应力磨粒磨损条件下,耐磨性还能显著提高。
The effect of the addition of Nb on the microstructure and properties of type 15-3 high-chromium cast iron has been studied. The results show that the additive Nb can react with carbon to form NbC which exhibits very high microhard- ness (HV_(0.1) 24000 MPa) and can be flnely dispersed in the matrix, effectively promo- ting the abrasive resistance of the alloy. In the solidification process of the liquid al- loy, the finely dispersed NbC particles can provide external nuclei for the nucleation of type M_7C_3 carbides and hinder their growth, resulting in a microstructural re- finement. The additive Nb can improve comprehensive properties of high-chromium cast iron, especially the hypereutectic cast iron with Nb. Not only the toughness of it will not be degraded, but its low-stress abrasive resistance can be evidently increased.
出处
《广东有色金属学报》
1991年第1期55-62,共8页
Journal of Guangdong Non-Ferrous Metals
关键词
高铬铸铁
铌
耐磨性
high-chromium cast iron
Nb
abrasive resistance
