为了实现航空用FGH96和IN718异质高温合金高可靠连接，为航空发动机关键部件安全评价及寿命预测提供基础数据及理论支持，采用扫描电子显微镜、金相显微镜研究了FGH96和IN718异质高温合金惯性摩擦焊接头显微组织形貌、高温拉伸试样断口形貌和断裂位置. 结果表明，焊接接头焊缝区FGH96和IN718均为等轴晶粒组织，晶粒尺寸约2 μm，焊缝区γ′和δ强化相基本全部溶解，热力影响区FGH96侧晶内γ′基本全部溶解，IN718侧δ强化相发生部分溶解，短棒状形貌消失，组织为粗细晶共存组织. 焊接接头650 ℃高温拉伸试样均断裂在焊缝区，但平均抗拉强度可达1 080.8 MPa，基本与IN718母材等强，高温拉伸试样起裂位置均处于试样边缘焊缝区，裂纹产生的原因主要是由于焊缝区γ′和δ强化相基本全部溶解，强化作用消失，性能降低. 裂纹产生后沿晶界由焊缝熔合线向试样内部扩展，当裂纹从试样边缘焊缝区四周同时向试样内部扩展时，在轴向拉力作用下形成“平台 + 凹坑”状断口特征，当裂纹从试样边缘焊缝区局部位置开始向试样内部扩展时，在轴向拉力作用下形成“平台 + 剪切”状断口特征.
In order to achieve highly reliable connection of FGH96 and IN718 dissimilar high-temperature alloys for aerospace applications, to provide basic data and theoretical support for the safety evaluation and life prediction of aero-engines key components. Scanning electron microscopy and metallurgical microscopy were used to study the FGH96 and IN718 dissimilar high-temperature alloy inertia friction welding joint microstructure morphology and high-temperature tensile specimens fracture morphology and fracture location. Test results show that the weld zone FGH96 and IN718 were equiaxed grain organization, the grain size is about 2 μm, the weld zone γ′ and δ strengthening phase were completely dissolved, the heat-force affected zone FGH96 side of the grain γ′also was completely dissolved, the IN718 side δ strengthening phase occured partially dissolved, the short rod-like shape was disappeared, coarse and fine crystal organization coexisted. The welded joint 650 ℃ high temperature tensile specimens were fractured with the weld zone, but the average tensile strength up to 1 080.8 MPa, basically with IN718 parent material equal strength, the high-temperature tensile specimens crack location were in the edge of the sample weld zone, the crack from the weld zone was mainly due to γ′ and δ strengthening phase basically all dissolved, the strengthening effect disappeared, the performance was reduced. The crack was generated along the grain boundary from the weld fusion line to the specimen internal expansion, the crack from the specimen edge weld area around the same time to the specimen internal expansion, under the action of axial tension to form a "platform + crater" fracture characteristics, when the crack from the specimen edge weld area local location to the specimen internal expansion, under the action of axial tension to form "platform + shear" fracture characteristics.
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