Antolak-Dudka Anna, Płatek Paweł, Durejko Tomasz, Baranowski Paweł, Małachowski Jerzy, Sarzyński Marcin, Czujko Tomasz
Department of Advanced Materials and Technologies, Military University of Technology, Urbanowicza 2, Warsaw 00-908, Poland.
Institute of Armament Technology, Military University of Technology, Urbanowicza 2, Warsaw 00-908, Poland.
Materials (Basel). 2019 Apr 15;12(8):1225. doi: 10.3390/ma12081225.
Laser Engineered Net Shaping (LENS) is currently a promising and developing technique. It allows for shortening the time between the design stage and the manufacturing process. LENS is an alternative to classic metal manufacturing methods, such as casting and plastic working. Moreover, it enables the production of finished spatial structures using different types of metallic powders as starting materials. Using this technology, thin-walled honeycomb structures with four different cell sizes were obtained. The technological parameters of the manufacturing process were selected experimentally, and the initial powder was a spherical Ti6Al4V powder with a particle size of 45-105 µm. The dimensions of the specimens were approximately 40 × 40 × 10 mm, and the wall thickness was approximately 0.7 mm. The geometrical quality and the surface roughness of the manufactured structures were investigated. Due to the high cooling rates occurring during the LENS process, the microstructure for this alloy consists only of the martensitic α' phase. In order to increase the mechanical parameters, it was necessary to apply post processing heat treatment leading to the creation of a two-phase α + β structure. The main aim of this investigation was to study the energy absorption of additively manufactured regular cellular structures with a honeycomb topology under static and dynamic loading conditions.
激光工程化净成形（LENS）目前是一项很有前景且不断发展的技术。它能够缩短设计阶段与制造过程之间的时间。LENS是传统金属制造方法（如铸造和塑性加工）的一种替代方法。此外，它能够使用不同类型的金属粉末作为起始材料来生产成品空间结构。利用这项技术，获得了具有四种不同胞元尺寸的薄壁蜂窝结构。制造过程的工艺参数是通过实验选定的，初始粉末是粒径为45 - 105 µm的球形Ti6Al4V粉末。试样尺寸约为40×40×10 mm，壁厚约为0.7 mm。对制造结构的几何质量和表面粗糙度进行了研究。由于LENS过程中出现的高冷却速率，该合金的微观结构仅由马氏体α'相组成。为了提高力学参数，有必要进行后处理热处理以形成α + β双相结构。本研究的主要目的是研究在静态和动态加载条件下，具有蜂窝拓扑结构的增材制造规则多孔结构的能量吸收情况。
