期刊
ACTA MATERIALIA
卷 201, 期 -, 页码 231-243出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2020.10.001
关键词
Laser powder bed fusion; aluminium alloy; microstructure; strengthening mechanism; damage initiation
资金
- Fonds de la recherche scientifique - FNRS (FRIA grant), Belgium
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [716678]
- WALInnov LongLifeAM project - Service public de Wallonie Economie Emploi Recherche (SPW-EER) [1810016]
- CNRS
- GrandLyon
- Rhone-Alpes Region (France)
AlSi10Mg manufactured by laser powder bed fusion (or selective laser melting) benefits from a very fine microstructure that imparts significant mechanical strength to the material compared to the cast alloy. The build platform temperature stands out as a significant processing parameter influencing the microstructure as it affects the cooling rate and thermal gradient during manufacturing. Setting the build platform temperature to 200 degrees C yields a negligible residual stress level. However, the strength is lower compared to that obtained using a build platform temperature of 35 degrees C, with a similar fracture strain. A detailed 3D microstructural analysis involving focused ion beam/scanning electron microscopy tomography was performed to describe the connectivity and size of the Si-rich eutectic network and link it to the strength and fracture strain. The coarser microstructure of the 200 degrees C build platform material is more prone to damage. The alpha-Al cells as well as the Si-rich precipitates present a larger size in the 200 degrees C material, the latter thus having a lower strengthening effect. The Si-rich eutectic network is also less interconnected and has a larger thickness in the 200 degrees C material. An analytical model is developed to exploit these microstructural features and predict the strength of the two materials. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据