Linear friction welding (LFW) technology, as an advanced manufacturing approach to fabricate the bimetallic turbine blisks, is receiving increasing attention from aerospace industries. Current work experimentally investigated the microstructural evolution and microhardness in LFW of FGH4096 and GH4169 superalloys. A complete dynamic recrystallization (DRX) was obtained in friction interface zone (FIZ) with no obvious secondary phases including δ and carbide phases on GH4169 side, and primary and secondary γ′ phases on FGH4096 side. The thermal-mechanically affected zone (TMAZ) was characterized by incomplete DRX where a significantly lower amount of low angle grain boundaries existed together with partially dissolved secondary phases depending upon the distance from weld line. The above-mentioned distinct microstructural behavior, manifesting different thermo-mechanical fields at different areas in the joint, necessitated the further analysis of numerical simulations of LFW of two dissimilar alloys. A thermo-mechanical coupling model was developed to predict the temperature, plastic strain and stress distributions. Satisfactory comparisons between numerical and experimental results were observed. The findings in the work are believed to be one of few currently available to focus on the study of metallurgical and thermo-mechanical coupling behavior of the dissimilar nickel-based superalloy joint made by the LFW process.

线性摩擦焊接（LFW）技术作为制造双金属涡轮机叶盘的一种先进制造方法，越来越受到航空航天工业的关注。目前的工作是通过实验研究FGH4096和GH4169合金的LFW的组织演变和显微硬度。在摩擦界面区（FIZ）获得了完整的动态重结晶（DRX），没有明显的次级相，包括GH4169侧的δ相和碳化物相，以及FGH4096侧的初级和次级γ′相。热机械影响区（TMAZ）的特征在于不完整的DRX，其中取决于与焊接线的距离，低角度晶粒边界的含量明显降低，并且部分溶解的第二相存在。上述明显的微观结构行为，由于在接头的不同区域表现出不同的热机械场，因此有必要进一步分析两种异种合金的LFW数值模拟。建立了一个热力耦合模型来预测温度，塑性应变和应力分布。数值和实验结果之间的比较令人满意。据信这项工作中的发现是目前可用于研究由LFW工艺制成的不同镍基高温合金接头的冶金和热机械耦合行为的少数几个研究之一。塑性应变和应力分布。在数值和实验结果之间观察到令人满意的比较。据信这项工作中的发现是目前可用于研究由LFW工艺制成的不同镍基高温合金接头的冶金和热机械耦合行为的少数几个研究之一。塑性应变和应力分布。数值和实验结果之间的比较令人满意。据信这项工作中的发现是目前可用于研究由LFW工艺制成的不同镍基高温合金接头的冶金和热机械耦合行为的少数几个研究之一。