Laser Powder Bed Fusion (L-PBF) is a popular technique for making intricate parts in various fields. Assessing the load-bearing capacity of components fabricated through L-PBF technique is crucial for broadening their applications across various industrial sectors. While prior research has primarily concentrated on static loads, cyclic loading is critical in real-world engineering applications. The purpose of this study is to investigate the influence of T6 heat treatment on the very high cycle fatigue (VHCF) performance of AlSi7Mg alloy fabricated using L-PBF technique by considering microstructural alteration and defect statistics. This study shows that the investigated heat treatment reduced VHCF response of the alloy. This is attributed to increased hydrogen and oxide porosity in conjunction with their increased diametral sizes along with microstructural alteration. The obtained results bring us closer to better understand and improve the use of the AlSi7Mg alloy in additive manufacturing. This offers a viable option for industries looking to benefit from the advantages of the L-PBF technique for manufacturing components.

中文翻译：

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探索 L-PBF AlSi7Mg 合金中的 VHCF 响应：T6 热处理对显微组织特征和缺陷分布的影响


激光粉末床熔融 (L-PBF) 是一种在各个领域制造复杂零件的流行技术。评估通过 L-PBF 技术制造的组件的承载能力对于扩大其在各个工业领域的应用至关重要。虽然之前的研究主要集中在静态载荷上，但循环载荷在实际工程应用中至关重要。本研究的目的是通过考虑微观结构变化和缺陷统计，研究 T6 热处理对采用 L-PBF 技术制造的 AlSi7Mg 合金的极高循环疲劳 (VHCF) 性能的影响。这项研究表明，所研究的热处理降低了合金的 VHCF 响应。这是由于氢和氧化物孔隙率的增加以及它们的直径尺寸的增加以及微观结构的改变。获得的结果使我们更加了解和改进 AlSi7Mg 合金在增材制造中的使用。这为那些希望从 L-PBF 技术的组件制造优势中受益的行业提供了一个可行的选择。