摘要
采用高能微弧火花沉积技术在SCH13钢表面制备Stellite合金涂层.利用扫描电子显微镜、能谱仪、X射线衍射仪对沉积层的显微组织形貌、成分及结构进行分析,并对微弧火花单脉冲沉积斑的形成与生长机制进行重点研究.结果表明,高能微弧火花作用下Stellite合金单脉冲沉积斑呈飞溅状,大量单脉冲斑的不断叠加最终形成具有一定厚度的沉积涂层.微弧火花沉积层依附于基体的界面以柱晶组织呈外延生长,并与基体形成良好的冶金结合,涂层稀释率较低,主要由γ-Co固溶体和铬的碳化物组成.随着工作电压的增加,沉积层显微组织略有粗化,其平均硬度较Stellite合金电极材料有显著提高.
Stellite alloy deposition layer was prepared with micro-arc spark deposition technique on SCH13 steel. The microstructure,chemical compositions and phase structure of the deposition layers were examined by scanning electron microscopy( SEM),energy dispersive spectroscopy( EDS) and X-ray diffraction( XRD),respectively. The formation and growth mechanism of a single pulse deposition spot were studied. The results showed that the single pulse deposition spot was in splash shape.A large number of the single pulse deposition spots were superimposed continuously and then a certain thickness deposition layers were formed. The deposition layer of SCH13 steel qrowed in a column crystal style,and the deposition layer had a good metallurgical combination with the SCH3 steels. The deposition layers were consisted of γ-Co solid solution and chromium carbides,and had a low dilution rate. The microstructure of the deposition layer was slightly coarser with the increasing of the processing voltage. The average hardness of the deposition layers increased significantly compared to that of the Stellite alloy electrode.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第3期11-14,18,共5页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51271126)
辽宁省自然科学基金资助项目(2013020101)
沈阳市科技局攻关资助项目(F13-070-2-00
F13-318-1-52)
