This paper aims to present a comprehensive review of the laser engineered net shaping (LENS) process in an attempt to provide the reader with a deep understanding of the controllable and fixed build parameters of metallic parts. The authors discuss the effect and interplay between process parameters, including: laser power, scan speed and powder feed rate. Further, the authors show the interplay between process parameters is pivotal in achieving the desired microstructure, macrostructure, geometrical accuracy and mechanical properties.,In this manuscript, the authors review current research examining the process inputs and their influences on the final product when manufacturing with the LENS process. The authors also discuss how these parameters relate to important build aspects such as melt-pool dimensions, the volume of porosity and geometry accuracy.,The authors conclude that studies have greatly enriched the understanding of the LENS build process, however, much studies remains to be done. Importantly, the authors reveal that to date there are a number of detailed theoretical models that predict the end properties of deposition, however, much more study is necessary to allow for reasonable prediction of the build process for standard industrial parts, based on the synchronistic behavior of the input parameters.,This paper intends to raise questions about the possible research areas that could potentially promote the effectiveness of this LENS technology.

中文翻译：

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金属零件的激光工程净成形 (LENS) 构建和工艺参数综述

本文旨在全面回顾激光工程净成形 (LENS) 工艺，试图让读者深入了解金属零件的可控和固定构建参数。作者讨论了工艺参数之间的影响和相互作用，包括：激光功率、扫描速度和送粉速度。此外，作者表明工艺参数之间的相互作用对于实现所需的微观结构、宏观结构、几何精度和机械性能至关重要。在这篇手稿中，作者回顾了当前的研究，检查工艺输入及其在制造时对最终产品的影响。镜头过程。作者还讨论了这些参数如何与重要的构建方面相关，例如熔池尺寸、孔隙率和几何精度的体积。作者得出结论，研究极大地丰富了对 LENS 构建过程的理解，但是，仍有许多研究要做。重要的是，作者揭示了迄今为止有许多详细的理论模型可以预测沉积的最终特性，但是，需要更多的研究来根据同步行为合理预测标准工业部件的构建过程的输入参数。,本文旨在提出有关可能促进该 LENS 技术有效性的可能研究领域的问题。