摘要
采用X射线衍射仪(XRD)、光学显微镜(OM)、磨料磨损试验机等,研究了以Ni60A为基体,添加不同量的Mo对等离子喷焊层组织和性能的影响。结果表明:Ni60A喷焊层中主要相为FeNi_3、Cr_7C_3、(Fe,Ni)_(23)B_6等,粗大的短棒状组织分布在镍基固溶体中;Mo的加入使等离子喷焊层中生成了大量均匀分布的MoSi_2、Mo_2C、MoC、Mo_3C_2等硬质相;喷焊层组织得到细化,形成更多的等轴晶;研究发现,MoC、Mo_2C主要由Mo_3C_2通过共析反应转变形成,Mo_xC_y相互聚集形成椭圆形碳化物;添加Mo之后喷焊层的耐磨性明显提高,Mo添加量为8%时,喷焊层的耐磨性较好,与Ni60A喷焊层相比,耐磨性提高了约30%。
Effects of Mo addition on microstructure and properties of the Ni6OA-based alloy coatings produced by plasma spaying welding were investigated by means of X-ray diffraction （XRD）, optical microscope （ OM）, SEM, EDS analysis and abrasive wear test. The results show that FeNi3 , Cr7C3 and （ Fe, Ni） 23 B6 are the main phases in the Ni6OA-based alloy coatings. Coarse and short rod phases distributed in Ni-based solid solution matrix are observed. With the addition of Mo, abundant hard phases of MoSi2, Mo2C, MoC and Mo3C2 are formed and distributed uniformly in the coatings. Meanwhile, the microstructure of the coatings is refined and more equiaxed grains are formed in the coatings. Mo3C2 are transformed into MoC and Mo2C by eutectoid reaction and these carbides present oval shape in the coatings. When the addition of Mo reaches 8% , the wear resistance of the coatings is better and increases by 30% compared with that of the Ni60A coating without Mo.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2016年第7期185-190,共6页
Transactions of Materials and Heat Treatment
基金
吉林省科技厅项目(3D511AC32416)
关键词
等离子喷焊
元素Mo
硬质相
耐磨性能
plasma spraying welding
Mo element
hard phase
wear resistance
