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采用氩弧熔焊的方法在镍铁基高温合金K4169表面熔敷高温金属间化合物Co3FeNb2.利用电镜扫描(SEM)和能谱分析(EDS)及X射线分析研究熔合区的微观组织特征及成分分布.结果表明,在K4169与高温金属间化合物之间形成了约85μm厚度的熔合区,熔合区无气孔、裂纹等缺陷,形成良好的冶金结合.根据能谱分析和X射线分析发现熔合区的组织大部分为γ’,γ和Co3FeNb2相,少量熔敷金属Co和Nb元素的扩散使得基材在熔合区局部得到强化.同时在熔合区形成了基材γ和γ’相与Co3FeNb2和NbNi9等Nb元素的化合物形成的机械混合物,结合牢固.
The high-temperature intermetallic compound Co3FeNb2 was deposited on the surface of nickel-iron based superalloy K4169 by argon arc welding.The microstructural characteristics and compositional distribution of the fused zone were studied by SEM and EDS and X-ray analysis The results show that the fusion zone of about 85μm thickness is formed between the K4169 and the high temperature intermetallic compound, and the defects such as porosity and crack are not formed in the fusion zone to form a good metallurgical bond.Based on the energy spectrum analysis and the X-ray analysis, Most of them are γ ’, γ and Co3FeNb2 phases, and the diffusion of a small amount of deposited Co and Nb elements makes the substrate strengthened locally in the fusion zone. At the same time, Nb and Nb’ Elemental compounds form a mechanical mixture that binds tightly.