含硼铁基耐磨复合材料的研制
Development of wear resistant Fe-based composite material containing boron
宗琳 刘政军
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作者单位：沈阳化工大学
中文关键字：堆焊；组织； 耐磨性；硬质相
英文关键字：hardfacing；microstructure；wear resistance；hard phase
中文摘要：采用等离子熔覆技术制备硼化物强化铁基堆焊合金。借助OM、SEM和XRD等分析手段对合金组织和硼化物相形貌进行分析，并与未加入硼的Fe-Cr-C的堆焊合金进行对比。结果表明：堆焊合金中加入2.5%的硼含量，能够诱发基体的马氏体转变，堆焊层形成大量硼化物，从而改善耐磨性。硼化物由大量层片状M23(C,B)6和少量蜂窝状M7(C B)3相组成，BC4与Cr2B的数量较少。耐磨粒磨损试验结果表明：加入2.5%硼含量的堆焊层中形成的大量高硬度硼化物分布在具有较高强韧性的马氏体和奥氏体基体上，使其具有最佳的耐磨性。
英文摘要： Fe-based hardfacing alloy reinforced with borides were prepared under plasma transferred arc weld-surfacing process(PTA). The microstructure and borides morphology were investigated by means of OM, SEM and XRD, which was compared to the Fe-Cr-C hardfacing alloy. The results showed that the martensite transformation of the matrix was induced and high volume fraction of borides were formed in the hardfacing layers as a result of the addition of 4.5%B in hardfacing alloys, which leads to the improvement of wear resistance significantly. The borides consists of high volume fraction of plate M23(C,B)6 and little volume fraction of honeycomb M7(C B)3, the content of BC4 and Cr2B is very little. The abrasion experimental results showed that the microstructure characteristic with a high volume fraction of borides with high microhardness are distributed in the martensite and austenite matrix with high strength and toughness as the addition of 2.5% B in Fe-Cr-C hardfacing alloy, which suggests that the hardfacing layers has a excellent wear resistance.