B含量对Fe-Cr-C系堆焊合金组织结构及耐磨性的影响  

Effect of B Content on Microstructure and Wear Resistance of Fe-Cr-C Surfacing Alloy

作　　者：刘一 刘奇聪 闫玉东 韩卓芮 庄明辉[1] LIU Yi;LIU Qicong;YAN Yudong;HAN Zhuorui;ZHUANG Minghui(School of Materials Science and Engineering,Jiamusi University,Jiamusi 154007,China)

机构地区：[1]佳木斯大学材料科学与工程学院,黑龙江佳木斯154007

出　　处：《材料保护》2024年第7期207-213,共7页Materials Protection

基　　金：国家级大学生创新创业训练计划项目(202310222117)。

摘　　要：为了进一步提高Fe-Cr-C系堆焊合金的耐磨性,采用等离子粉末堆焊技术,通过调整堆焊合金粉体中硼铁粉的添加量,在Q235钢表面制备不同B含量的Fe-Cr-C耐磨堆焊合金层,并采用X射线衍射(XRD)、扫描电镜(SEM)、能谱(EDS)及磨粒磨损试验等分析测试方法,探究B添加量对Fe-Cr-C系堆焊合金组织结构、物相组成及耐磨性的影响。结果表明:当B添加量(以硼铁粉计,下同)为0时,堆焊合金的组织由树枝晶状Fe和菊花状(Fe,Cr)_(7)C_(3)+Fe共晶组织组成。随着B添加量的增加,堆焊层中(Fe,Cr)_(7)(C,B)_(3)硬质相的体积分数增加。(Fe,Cr)_(7)(C,B)_(3)相的析出量达到一定值后,初晶B_(0.7)Fe_(3)C_(0.3)相生成。当B添加量为20.0%时,(Fe,Cr)_(2)B硬质相大量析出。堆焊层的硬度整体呈现上升-陡降-上升的趋势,B-10试样的硬度达到63.1 HRC。磨粒磨损试验结果显示,堆焊合金层耐磨性呈现上升-平缓-上升的趋势,B-20试样的耐磨性增至B-0试样的2.8倍。In order to further improve the wear resistance of Fe-Cr-C surfacing alloy,Fe-Cr-C wear-resistant surfacing alloy layers with different B addition amounts were prepared on the surface of Q235 steel by adjusting the amount of ferroboron powder added to the surfacing alloy powder using plasma powder surfacing technology.The effects of B addition amount on the microstructure,phase composition and wear resistance of Fe-Cr-C surfacing alloy were investigated using X-ray diffraction(XRD),scanning electron microscopy(SEM),energy-disper-sive spectroscopy(EDS),abrasive wear tests and other analysis and testing methods.Results showed that when the addition amount of B was 0,the microstructure of the surfacing alloy was composed of dendritic Fe and chrysanthemum-like(Fe,Cr)_(7)(C,B)_(3)+Fe eutectic structure.With the increase of B addition amount,the volume fraction of the(Fe,Cr)_(7)(C,B)_(3)hard phase in the surfacing layer increased.After the precipitation amount of the(Fe,Cr)_(7)(C,B)_(3)phase reached a certain value,the primary B_(0.7)Fe_(3)C_(0.3)phase was formed.When the B addition amount was 20.0%(mass fraction),a large amount of the(Fe,Cr)_(2)B hard phase was precipitated.The hardness of the surfacing layer showed an overall trend of rising-steep drop-rising,and the hardness of the B-10 sample reached 63.1 HRC.The results of the abrasive wear test showed that the wear resistance of the surfacing alloy layer exhibited an trend of upward-flat-upward,and the wear resistance of the B-20 sample increased to 2.8 times that of the B-0 sample.

关 键 词：Fe-Cr-C合金 等离子粉末堆焊 B添加量 组织结构 耐磨性能 

分 类 号：TG455[金属学及工艺—焊接]