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使用微型试样确定激光粉末床熔融（LPBF）加工的沉积态和后处理态Inconel 718的局部性能和断裂行为。

The Use of Miniature Specimens to Determine Local Properties and Fracture Behavior of LPBF-Processed Inconel 718 in as-Deposited and Post-Treated States.

作者信息

Dzugan Jan, Seifi Mohsen, Rund Martin, Podany Pavel, Grylls Richard, Lewandowski John J

机构信息

COMTES FHT a.s., Prumyslova 995, 33441 Dobrany, Czech Republic.

Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, OH 4163, USA.

出版信息

Materials (Basel). 2022 Jul 5;15(13):4724. doi: 10.3390/ma15134724.

DOI:10.3390/ma15134724
PMID:35806846
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9268185/
Abstract

This paper summarizes the assessment of directional anisotropy in local mechanical properties for Laser Powder Bed Fusion (LPBF) IN-718 bulk samples via the use of miniature samples excised from the bulk for both as-deposited and post-treated states. The quasi-static tensile properties at room temperature are investigated at several different locations along the build direction and at different orientations for both considered states. A comparison between the excised miniature tensile specimens and standard-sized sample results have also been conducted and exhibit very good agreement. Significant anisotropy is present in mechanical properties at different build heights for the as-deposited state, while the post-treated material exhibited more homogenous properties, both along the height and for different sampling orientations. However, significant reductions (e.g., >30%) in the strength (Yield, UTS) along with a significant increase in the reduction in area at fracture is found for post-processed materials. Metallography and fractography analyses were conducted in order to begin to determine the source(s) of this anisotropy for the as-deposited state.

摘要

本文总结了通过使用从大块材料中切下的微型样品，对激光粉末床熔融（LPBF）制备的IN-718大块样品在沉积态和后处理态下的局部力学性能中的方向各向异性进行的评估。研究了在两个考虑状态下，沿构建方向的几个不同位置以及不同取向的室温准静态拉伸性能。还对切下的微型拉伸试样和标准尺寸样品的结果进行了比较，结果显示出很好的一致性。对于沉积态，在不同的构建高度处，力学性能存在显著的各向异性，而后处理材料在高度方向以及不同取样取向方面表现出更均匀的性能。然而，发现后处理材料的强度（屈服强度、抗拉强度）显著降低（例如，>30%），同时断裂时的断面收缩率显著增加。为了开始确定沉积态这种各向异性的来源，进行了金相分析和断口分析。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e799/9268185/c55888b71c8e/materials-15-04724-g020.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e799/9268185/d1f4e4a2963b/materials-15-04724-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e799/9268185/093920dff1f8/materials-15-04724-g017.jpg
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