Fe-Cr-B白口铸铁的组织与性能研究  

Study on the Microstructure and Properties of Fe-Cr-B White Cast Iron

作　　者：刘仲礼 陈祥[2] LRJ Zhongli;CHEN Xiang(School of Nuclear Equipment and Nuclear Engineering,Yantai University,Yantai 264005,China;School of Materials and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]烟台大学核装备与核工程学院,山东烟台264005 [2]清华大学材料学院,北京100084

出　　处：《铸造技术》2023年第4期371-375,共5页Foundry Technology

基　　金：国家自然科学基金面上项目(52175192)。

摘　　要：白口铸铁是一种不可替代的传统耐磨钢铁材料,在组织上以共晶碳化物为耐磨相,虽然硬度较高,但韧性偏低,限制了其寿命及应用工况。本文研究一类以硼化物为耐磨相的Fe-Cr-B新型白口铸铁,旨在获得优良的综合性能,来发展传统白口铸铁。该类白口铸铁在成分上具有低碳、高铬、高硼的特点;铸态条件下,基体为大部分板条状马氏体,耐磨相为比共晶碳化物显微硬度更高的共晶硼化物M2B;具有良好的淬透性,可像镍硬铸铁一样不经过热处理直接应用,且具有良好的综合性能。White cast iron is a traditional unreplaced wear-resistant material that takes eutectic carbides as the wear-resistant phase,possessing high hardness but low ductility,thus limiting the lifetime and work conditions.In this paper,a new Fe-Cr-B white cast iron was studied,which uses borides as the wear-resistant phase to achieve better comprehensive properties.This kind of white cast iron is characterized by low C,high Cr and high B chemical compositions.Under as-cast conditions,the matrix is mostly lath-type martensite,and the wear-resistant phase is eutectic borides,i.e.,M2B,the microhardness of which is higher than that of carbides.Fe-Cr-B white cast iron possesses higher hardenability and can be used without quenching,similar to Ni-harden white cast iron.Moreover,the comprehensive properties of the Fe-Cr-B white cast iron are feirly good.

关 键 词：白口铸铁 硼化物 显微硬度 板条状马氏体 淬透性 

分 类 号：TG143.1[一般工业技术—材料科学与工程]