Abstract Additive manufacturing (AM) is emerging as an alternative to conventional subtractive manufacturing methods with the goal to deliver unique and complex net or near-net shaped parts. AM components should operate under various loading conditions, from static to complex dynamic multiaxial loadings, therefor, fatigue performance is often a key consideration. Intrinsic AM defects such as Lack of Fusion (LOF) defects, porosities, and un-melted particles are important for fatigue as a local phenomenon which usually starts at stress concentrations. Defects can be minimized by process optimization and/or post-processing but may not be fully eliminated. Full-scale testing, which is typically very costly and often necessary to assess reliability for fatigue performance of safety critical components, could be reduced by robust analytical fatigue performance prediction techniques. This work reviews the literature on the influential microstructural attributes on fatigue performance of AM parts with a focus on generated defects. This includes AM defect characterization and statistical analysis methods, as well as effect of process parameters and post-processing on defects, and consequently fatigue performance. The review also includes defect-based, microstructure-sensitive, and multiscale models proposed in the literature for modeling the effect of defects on fatigue performance and provides an outlook for additional research needed.

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增材制造金属中的缺陷及其对疲劳性能的影响：最新评论

摘要增材制造 (AM) 正在成为传统减材制造方法的替代品，其目标是提供独特且复杂的网状或近网状零件。AM 组件应在各种负载条件下运行，从静态到复杂的动态多轴负载，因此，疲劳性能通常是一个关键考虑因素。固有的 AM 缺陷，例如缺乏熔合 (LOF) 缺陷、孔隙率和未熔化的颗粒，对于疲劳很重要，因为疲劳是一种通常始于应力集中的局部现象。缺陷可以通过工艺优化和/或后处理最小化，但可能无法完全消除。全尺寸测试，这通常非常昂贵，而且通常需要评估安全关键部件疲劳性能的可靠性，可以通过强大的分析疲劳性能预测技术来减少。这项工作回顾了有关对增材制造零件疲劳性能有影响的微观结构属性的文献，重点是生成的缺陷。这包括增材制造缺陷表征和统计分析方法，以及工艺参数和后处理对缺陷的影响，以及疲劳性能。该评论还包括文献中提出的基于缺陷的、微观结构敏感的和多尺度模型，用于对缺陷对疲劳性能的影响进行建模，并为所需的其他研究提供了展望。这包括增材制造缺陷表征和统计分析方法，以及工艺参数和后处理对缺陷的影响，以及疲劳性能。该评论还包括文献中提出的基于缺陷的、微观结构敏感的和多尺度模型，用于对缺陷对疲劳性能的影响进行建模，并为所需的其他研究提供了展望。这包括增材制造缺陷表征和统计分析方法，以及工艺参数和后处理对缺陷的影响，以及疲劳性能。该评论还包括文献中提出的基于缺陷的、微观结构敏感的和多尺度模型，用于对缺陷对疲劳性能的影响进行建模，并为所需的其他研究提供了展望。