高铬白口铸铁加硼降钼镍的可行性试验研究  

Adding Boron and Reducing Molybdenum and Nickel in the Feasibility Experiment Research of High Chromium White Cast Iron

作　　者：朱凯[1] 张艳玲[1] 

机构地区：[1]商丘职业技术学院,河南商丘476000

出　　处：《商丘职业技术学院学报》2017年第5期81-84,共4页JOURNAL OF SHANGQIU POLYTECHNIC

摘　　要：针对标准Cr20白口铸铁生产成本高的问题,在其他化学成分基本不变的情况下,用0.30%的B替代50%Mo和50%Ni铸造了加硼Cr20白口铸铁试样.借助于硬度计、冲击试验机、金相显微镜、X线衍射仪和动载磨粒磨损机等,对比分析了标准Cr20白口铸铁与加硼Cr20白口铸铁的组织性能.结果表明:加硼Cr20白口铸铁与标准Cr20白口铸铁的铸态组织均由共晶碳化物M7C3+奥氏体+少量马氏体组成.加硼Cr20白口铸铁的碳化物呈短杆状或块状均匀分布,标准Cr20白口铸铁的碳化物呈网状分布.加硼Cr20白口铸铁相对标准Cr20白口铸铁,冲击韧性下降了0.5J/cm^2,硬度提高了4.6HRC,碳化物量提高了4.1%.耐磨性提高了2%.用适量的硼替代高铬白口铸铁中的部分Mo,Ni降低生产成本是完全可行的.In view of the high production cost of standard Cr20 white cast iron,the boron Cr20 white cast iron sample was cast with 0.30% B instead of 50%Mo and 50%Ni in the case that the other chemical compositions were basically unchanged.By means of hardness tester,impact testing machine,metallographic microscope,X-ray diffractometer and dynamic wear particle abrasion machine,the microstructure and properties of standard Cr20 white cast iron and boron doped Cr20 white cast iron were compared and analyzed.The results show that the cast structure of Cr20 white cast iron and standard Cr20 white cast iron is composed of eutectic carbide M7,C3＋ austenite＋ a small amount of martensite.The carbides of boron doped Cr20 white cast iron are uniformly distributed in short rod or block,and the carbide of standard Cr20 white cast iron is meshed.Compared with standard Cr20 white cast iron,the impact toughness of boron doped Cr20 white cast iron decreased by 0.5 J/cm^2,the hardness increased by 4.6 HRC,and the amount of carbide increased by 4.1%.The wear resistance has been increased by 2%.It is feasible to use partial boron instead of part of Mo in high chromium white cast iron to reduce production cost by Ni.

关 键 词：Cr20白口铸铁 硼 力学性能 耐磨性 

分 类 号：TG143.9[一般工业技术—材料科学与工程]