镍基高温合金GH4065A与IN718惯性摩擦焊接研究进展

Research Progress on Inertial Friction Welding of Nickel-based Superalloy GH4065A and IN718

随着高性能发动机制造材料与连接技术的不断革新,镍基高温合金GH4065A与IN718逐渐受到广泛关注并成功应用。目前,以惯性摩擦焊为主导的高温合金连接技术具有较高的可靠性,是国际公认的发动机制造核心技术之一。本文综述了GH4065A与IN718这2种典型高温合金的惯性摩擦焊技术,结合时效处理方式,对比分析了同质/异质接头的宏观形貌、微观组织、室温/高温力学性能等,重点关注了摩擦热输入对惯性摩擦焊接头各区域在宏微观尺度下的影响规律,总结了同质/异质接头中晶粒尺寸及分布情况,分析了接头各区域所经历的回复与再结晶过程,明确了晶粒长大的诱导机制。基于宏观形貌与微观组织的变化规律,研究了高温合金GH4065A与IN718内部强化相的分布情况,结合室温/高温力学性能变化趋势,阐明了强化相对接头力学性能的影响规律,通过分析拉伸测试后的断口形貌,揭示了接头形成机理与断裂机制,评价了接头连接质量与实际应用可行性,优化了发动机的智能制造过程,进一步推动了GH4065A与IN718镍基高温合金在高端装备制造领域的可靠应用。

With the continuous innovation of high-performance engine manufacturing materials and joining technology,nickel-based superalloys GH4065A and IN718 have been widely concerned and successfully applied.At present,the welding and joining technology of superalloys led by inertia friction welding has high reliability and is one of the internationally recog-nized core technologies of engine manufacturing.In this paper,the inertial friction welding technology of two typical superalloys GH4065A and IN718 was reviewed in combination with the aging treatment method.The macro morphology,microstruc-ture,room temperature/high temperature mechanical properties of homogenous/heterogeneous joints were compared and ana-lyzed.Focusing on the effects of friction heat input on various regions of inertial friction welded joints at macro and micro scales,the grain size and distribution in homogenous/heterogeneous joints were summarized,the recovery and recrystallization processes in each region of the joints were analyzed,and the induction mechanism of grain growth was identified.Based on the changes of macroscopic morphology and microscopic structure,the distribution of strengthening phase in superalloys GH4065A and IN718 was studied,and the influence of strengthening on mechanical properties of joints was illustrated in combination with the changing trend of mechanical properties at room temperature/high temperature.The formation mechanism and fracture mechanism of joints were revealed by analyzing the fracture morphology after tensile test.The connection quality and practical application reliability were evaluated and the intelligent manufacturing process of engines further promoting the large-scale ap-plication of GH4065A and IN718 nickel-based superalloys in the high-end equipment manufacturing field.