钼含量对Fe-Cr-B堆焊合金显微组织及耐磨性的影响  

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

作　　者：线澜清 庄明辉[1] 陈超 牟立婷 井瑞 马振[1] XIAN Lan-qing;ZHUANG Ming-hui;CHEN Chao;MU Li-ting;JING Rui;MA Zhen(School of Materials Science and Engineering,Jiamusi University,Jiamusi 154007,China;School of Materials Science and Engineering,Shandong University,Jinan 250100,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 [2]山东大学材料科学与工程学院,山东济南250100

出　　处：《材料保护》2022年第10期64-68,共5页Materials Protection

基　　金：黑龙江省自然科学基金项目(LH2020E025);黑龙江省基本科研业务费基础研究项目(2019-KYYWF-1370)资助。

摘　　要：为了研究合金元素Mo在Fe-Cr-B系耐磨堆焊合金中的作用,采用等离子弧堆焊,通过调整堆焊合金粉体中钼铁粉的加入量,在Q235表面制备不同Mo含量的Fe-Cr-B耐磨堆焊合金层,采用扫描电镜、XRD等分析测试方法,研究合金元素Mo的变化对Fe-Cr-B堆焊合金显微组织及性能的影响。结果表明:在堆焊合金中未添加钼铁粉时,堆焊合金物相由M_(2)B和(Fe, Cr)两相组成。随着堆焊合中钼铁粉的添加,当Mo含量达到2.0%(质量分数,下同)时,堆焊合金中有新相FeMo_(2)B_(2)析出,此时堆焊合金由M_(2)B、FeMo_(2)B_(2)和(Fe, Cr)三相组成;堆焊合金的洛氏硬度取决于M_(2)B、FeMo_(2)B_(2)和(Fe, Cr)的体积分数,随着Mo含量的增加,堆焊合金的洛氏硬度和耐磨性呈逐渐增加的趋势,与未添加Mo的堆焊合金相比,Mo含量为8%时的堆焊合金的耐磨性提高了1.2倍。In order to study the role of alloying element Mo in the Fe-Cr-B wear-resistant surfacing alloy, plasma arc welding surfacing was used to prepare Fe-Cr-B wear-resistant surfacing alloy layer with different Mo contents on the surface of Q235 by adjusting the amount of molybdenum iron powder in the surfacing alloy powder. Scanning electron microscopy, XRD and other analysis and testing methods were used to study the effect of the change of Mo content on the microstructure and properties of Fe-Cr-B surfacing alloy. Results showed that when no molybdenum iron powder was added into the surfacing alloy, the surfacing alloy consisted of M_(2)B and(Fe, Cr) phases. When the content of Mo in the surfacing alloy reached 2%(mass fraction), a new phase FeMo_(2)B_(2)precipitated in the surfacing alloy. In such case, the surfacing alloy consisted of M_(2)B, FeMo_(2)B_(2)and(Fe, Cr) phases;and the Rockwell hardness of the surfacing alloy depended on the volume fractions of M_(2)B, FeMo_(2)B_(2)and(Fe, Cr). With the increase of Mo content, the Rockwell hardness and wear resistance of the surfacing alloy gradually increased. Compared with the surfacing alloy without Mo, the wear resistance of surfacing alloy with 8%(mass fraction) Mo was improved by 1.2 times.

关 键 词：等离子堆焊 FE-CR-B合金 Mo含量 组织 性能 

分 类 号：TH117[机械工程—机械设计及理论]