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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
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- DOI:
- 作者:
- 刘仲礼1陈祥2
LIU Zhongli 1 , CHEN Xiang2
- 作者单位:
- 1. 烟台大学核装备与核工程学院2. 清华大学材料学院
1. School of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai 264005, China; 2. School of Materials and Engineering, Tsinghua University, Beijing 100084, China
- 关键词:
- 白口铸铁;硼化物;显微硬度;板条状马氏体;淬透性;
white cast iron; borides; microhardness; lath-type martensite; hardenability
- 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., M 2 B, 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 fairly good.