Alloy 718 is commonly used in the maritime and aerospace industries due to its strength and durability, particularly in engine rotating components such as disks, fan blades, and high-pressure compressors. As a new type of 3D printing technology, directed energy deposition (DED) can employ lasers to melt metal powders or wires to fabricate arbitrary-shaped workpieces directly from customized data, thereby making machining more synergistic and intuitive. However, the surface properties of the DED-printed alloy 718 samples, such as surface roughness and wear resistance, are typically subpar. By introducing severe plastic deformation to the near-surface, ultrasonic nanocrystal surface modification (UNSM) can be used as a post-processing method and results in altered properties. The uniaxial tensile test reveals that the UNSM-treated alloy 718 exhibits a higher mechanical property. Moreover, using a fretting test rig in accordance with the cylinder-on-plane agreement, a higher wear resistance for UNSM-treated alloy 718 is observed. This study employs the finite element method to fully comprehend the effect of UNSM on wear performance. The fretting wear process of Inconel 718 alloy is established using an energy-based finite element model. Considering the severe practical scenarios, the Johnson–Cook constitutive model is implemented, with the linear isotropic hardening model capturing the plastic behavior. In comparison to experimental measurements, the finite element results demonstrate unprecedented wear loss consistency with an error of less than 2%. Therefore, we conclude that the finite element model built in this study exhibits a high accuracy and can be used to analyze the effect of UNSM on fretting wear behavior. According to finite element analysis, as the normal load increases, the improvement in wear resistance induced by UNSM decreases. Given that the finite element model is based on the energy method, the effects of coefficient of friction (COF) and wear coefficient modified by UNSM are investigated separately. According to the findings, the UNSM-modified COF and wear coefficient play a significant role in determining the wear characteristics. Due to the removal of a substantial amount of material from the central area of the alloy 718 surface by wear, it is also possible to observe that severe plastic strains are primarily concentrated at the edges of the wear scars.

718 合金因其强度和耐用性而常用于航海和航空航天工业，特别是发动机旋转部件，如磁盘、风扇叶片和高压压缩机。作为一种新型的 3D 打印技术，定向能量沉积 (DED) 可以利用激光熔化金属粉末或线材，直接根据定制数据制造任意形状的工件，从而使加工更加协同和直观。然而，DED 打印的合金 718 样品的表面特性，例如表面粗糙度和耐磨性，通常低于标准。通过在近表面引入严重的塑性变形，超声波纳米晶体表面改性 (UNSM) 可用作后处理方法并导致性能改变。单轴拉伸试验表明，经过 UNSM 处理的合金 718 具有更高的机械性能。此外，使用符合圆柱平面协议的微动试验台，观察到 UNSM 处理合金 718 具有更高的耐磨性。本研究采用有限元方法来全面了解 UNSM 对磨损性能的影响。使用基于能量的有限元模型建立了 Inconel 718 合金的微动磨损过程。考虑到严酷的实际情况，实施了 Johnson-Cook 本构模型，线性各向同性硬化模型捕捉塑性行为。与实验测量相比，有限元结果证明了前所未有的磨损损失一致性，误差小于 2%。所以，我们得出结论，本研究中建立的有限元模型具有很高的准确性，可用于分析 UNSM 对微动磨损行为的影响。根据有限元分析，随着法向载荷的增加，由 UNSM 引起的耐磨性提高会降低。鉴于有限元模型基于能量法，分别研究了 UNSM 修改后的摩擦系数 (COF) 和磨损系数的影响。根据研究结果，UNSM 修正摩擦系数和磨损系数在确定磨损特性方面起着重要作用。由于磨损从合金 718 表面的中心区域去除了大量材料，还可以观察到严重的塑性应变主要集中在磨痕的边缘。根据有限元分析，随着法向载荷的增加，由 UNSM 引起的耐磨性提高会降低。鉴于有限元模型基于能量法，分别研究了 UNSM 修改后的摩擦系数 (COF) 和磨损系数的影响。根据研究结果，UNSM 修正摩擦系数和磨损系数在确定磨损特性方面起着重要作用。由于磨损从合金 718 表面的中心区域去除了大量材料，还可以观察到严重的塑性应变主要集中在磨痕的边缘。根据有限元分析，随着法向载荷的增加，由 UNSM 引起的耐磨性提高会降低。鉴于有限元模型基于能量法，分别研究了 UNSM 修改后的摩擦系数 (COF) 和磨损系数的影响。根据研究结果，UNSM 修正摩擦系数和磨损系数在确定磨损特性方面起着重要作用。由于磨损从合金 718 表面的中心区域去除了大量材料，还可以观察到严重的塑性应变主要集中在磨痕的边缘。分别研究了 UNSM 修改的摩擦系数 (COF) 和磨损系数的影响。根据研究结果，UNSM 修正摩擦系数和磨损系数在确定磨损特性方面起着重要作用。由于磨损从合金 718 表面的中心区域去除了大量材料，还可以观察到严重的塑性应变主要集中在磨痕的边缘。分别研究了 UNSM 修改的摩擦系数 (COF) 和磨损系数的影响。根据研究结果，UNSM 修正摩擦系数和磨损系数在确定磨损特性方面起着重要作用。由于磨损从合金 718 表面的中心区域去除了大量材料，还可以观察到严重的塑性应变主要集中在磨痕的边缘。