添加Mn、Mo、Ti合金元素对激光熔覆WC-FeNiCr复合涂层组织及磁性能的影响

Influence of Mn、Mo、Ti Additions on Microstructure and Magnetic Properties of WC-FeNiCr Composite Coatings

研究了添加Mn、Mo、Ti合金元素对激光熔覆Fe Ni Cr+60%WC复合熔覆涂层微观组织和磁性能的影响。利用扫描电子显微镜(SEM),能谱仪(EDS),X射线衍射仪(XRD)对熔覆层进行微观组织、成分及物相分析。利用振动样品磁强计(VSM)对熔覆层的磁性能进行测试。研究结果表明激光熔覆WC-Fe Ni Cr复合涂层与基体具有良好冶金结合,表面无裂纹、气孔等缺陷。Mn、Mo、Ti合金元素的加入,使得复合涂层冶金反应及组织形貌更加复杂,Fe、Ni、Cr元素之间存在相互作用并与WC之间存在互熔扩散,并生成了新的无磁相Ti C,Mo C,Fe-Cr(σ相),Cr0.19Fe0.7Ni0.11,而且Mn、Mo、Ti合金元素的加入使复合涂层相对磁导率显著降低,复合涂层磁性能具有较强的稳定性。

The influence of Mn、Mo、Ti additions on the microstructure and magnetic properties of Fe Ni Cr/60%WC composite coatings produced by laser cladding are investigated. The microstructure, composition and phase of Fe Ni Cr/60% WC coatings are characterized using scanning electron microscopy（SEM）, transmission electron microscone（TEM） and X-ray diffraction（XRD）. The magnetic properties of the composite coatings are examined by a vibrating sample magnetometer（VSM）. The results show that there′s good metallurgical combination between WC-Fe Ni Cr composite coatings and substrate, no defects on the surface such as porosity and crack. With the addition of Mn, Mo, Ti, the metallurgical reaction and microstructure is more complex, there′re interaction between elements of Fe, Ni, Cr and mutual fusion diffusion with WC, generate new non-magnetic phases Ti C, Mo C, Fe-Cr（sigma）, Cr0.19Fe0.7Ni0.11. And that with the addition of Mn, Mo, Ti, composite coating′s relative permeability decreases significantly, and magnetic has strong stability.