Purpose

The purpose of this paper is to study the effects of printing strategies and processing parameters on wall thickness, microhardness and compression strength of Inconel 718 superalloy thin-walled honeycomb lattice structures manufactured by laser powder bed fusion (L-PBF).

Design/methodology/approach

Two printing contour strategies were applied for producing thin-walled honeycomb lattice structures in which the laser power, contour path, scanning speed and beam offset were systematically modified. The specimens were analyzed by optical microscopy for dimensional accuracy. Vickers hardness and quasi-static uniaxial compression tests were performed on the specimens with the least difference between the design wall thickness and the as built one to evaluate their mechanical properties and compare them with the counterparts obtained by using standard print strategies.

Findings

The contour printing strategies and process parameters have a significant influence on reducing the fabrication time of thin-walled honeycomb lattice structures (up to 50%) and can lead to improve the manufacturability and dimensional accuracy. Also, an increase in the young modulus up to 0.8 times and improvement in the energy absorption up to 48% with respect to those produced by following a standard strategy was observed.

Originality/value

This study showed that printing contour strategies can be used for faster fabrication of thin-walled lattice honeycomb structures with similar mechanical properties than those obtained by using a default printing strategy.

中文翻译：

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Inconel 718薄壁蜂窝结构的激光粉末床熔合可制造性

目的

本文的目的是研究打印策略和加工参数对激光粉末床融合 (L-PBF) 制造的 Inconel 718 超合金薄壁蜂窝晶格结构的壁厚、显微硬度和抗压强度的影响。

设计/方法/方法

两种打印轮廓策略被应用于生产薄壁蜂窝晶格结构，其中激光功率、轮廓路径、扫描速度和光束偏移被系统地修改。通过光学显微镜分析样品的尺寸精度。维氏硬度和准静态单轴压缩试验对设计壁厚和实际建造的样本之间的差异最小，以评估它们的机械性能，并将它们与使用标准打印策略获得的对应物进行比较。

发现

轮廓打印策略和工艺参数对减少薄壁蜂窝晶格结构的制造时间（高达 50%）有显着影响，并可以提高可制造性和尺寸精度。此外，与按照标准策略生产的那些相比，观察到杨氏模量增加高达 0.8 倍，能量吸收提高高达 48%。

原创性/价值

这项研究表明，与使用默认打印策略获得的相比，打印轮廓策略可用于更快地制造具有相似机械性能的薄壁晶格蜂窝结构。