Inconel 718 (IN-718) has excellent mechanical and chemical properties at high temperature, which has been widely applied in aerospace, ocean, and chemical industries. Meanwhile, the super high temperature properties lead to its poor machinability and machined surface integrity. Good machinability and surface integrity of IN-718 have always been challenging topics in the field of mechanical machining. The machinability and surface integrity of IN-718 was reviewed in this paper. The influences of chemical elements, microstructure, cutting parameters, and cutting environments on machinability were discussed. Cutting force, specific energy, and tool wear were analyzed as the main factors of machinability evaluation index. The characteristics of machined surface integrity including surface morphology (such as surface defects and surface roughness), microstructure modifications (such as plastic deformation, grain size, and white layer) and mechanical properties (such as microhardness and residual stress) related to IN-718 were presented. The state-of-the-art of machining IN-718 showed that most current research focused on its poor machinability and surface integrity in the aspect of material characteristics. There is lack of research on machinability from the viewpoint of geometrical structure of the part to be machined. Therefore, it is important to further study the manufacturability (the difficulty of the process from material to part) of IN-718 components with complex geometrical surface and profiles to achieve shape control and precise design.

Graphical abstract

Inconel 718（IN-718）在高温下具有出色的机械和化学性能，已广泛应用于航空航天，海洋和化学工业。同时，超高温性能导致其可加工性和机械加工表面完整性差。在机械加工领域，IN-718的良好可加工性和表面完整性一直是具有挑战性的主题。本文对IN-718的可加工性和表面完整性进行了综述。讨论了化学元素，显微组织，切削参数和切削环境对切削性能的影响。分析切削力，比能量和工具磨损，作为切削性评估指标的主要因素。加工表面完整性的特征包括表面形态（例如表面缺陷和表面粗糙度），介绍了与IN-718相关的微观结构修改（例如塑性变形，晶粒尺寸和白层）和机械性能（例如显微硬度和残余应力）。最新的机加工IN-718表明，大多数当前的研究集中在材料特性方面，其可加工性和表面完整性差。从被加工零件的几何结构的角度来看，缺乏可加工性的研究。因此，重要的是进一步研究具有复杂几何表面和轮廓的IN-718组件的可制造性（从材料到零件的加工难度），以实现形状控制和精确设计。并介绍了与IN-718相关的机械性能（例如显微硬度和残余应力）。最新的机加工IN-718表明，大多数当前的研究集中在材料特性方面，其可加工性和表面完整性差。从被加工零件的几何结构的角度来看，缺乏可加工性的研究。因此，重要的是进一步研究具有复杂几何表面和轮廓的IN-718组件的可制造性（从材料到零件的加工难度），以实现形状控制和精确设计。并介绍了与IN-718相关的机械性能（例如显微硬度和残余应力）。最新的机加工IN-718表明，大多数当前的研究集中在材料特性方面，其可加工性和表面完整性差。从被加工零件的几何结构的角度来看，缺乏可加工性的研究。因此，重要的是进一步研究具有复杂几何表面和轮廓的IN-718组件的可制造性（从材料到零件的加工难度），以实现形状控制和精确设计。从被加工零件的几何结构的角度来看，缺乏可加工性的研究。因此，重要的是进一步研究具有复杂几何表面和轮廓的IN-718组件的可制造性（从材料到零件的加工难度），以实现形状控制和精确设计。从被加工零件的几何结构的角度来看，缺乏可加工性的研究。因此，重要的是进一步研究具有复杂几何表面和轮廓的IN-718组件的可制造性（从材料到零件的加工难度），以实现形状控制和精确设计。

图形概要