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首页> 外文期刊>Micromachines >Effects of Process Conditions on the Mechanical Behavior of Aluminium Wrought Alloy EN AW-2219 (AlCu6Mn) Additively Manufactured by Laser Beam Melting in Powder Bed
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Effects of Process Conditions on the Mechanical Behavior of Aluminium Wrought Alloy EN AW-2219 (AlCu6Mn) Additively Manufactured by Laser Beam Melting in Powder Bed

机译：工艺条件对粉末床激光熔炼增材制造的铝锻合金EN AW-2219（AlCu6Mn）力学性能的影响

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摘要

Additive manufacturing is especially suitable for complex-shaped 3D parts with integrated and optimized functionality realized by filigree geometries. Such designs benefit from low safety factors in mechanical layout. This demands ductile materials that reduce stress peaks by predictable plastic deformation instead of failure. Al?￠????Cu wrought alloys are established materials meeting this requirement. Additionally, they provide high specific strengths. As the designation ?￠????Wrought Alloys?￠???? implies, they are intended for manufacturing by hot or cold working. When cast or welded, they are prone to solidification cracks. Al?￠????Si fillers can alleviate this, but impair ductility. Being closely related to welding, Laser Beam Melting in Powder Bed (LBM) of Al?￠????Cu wrought alloys like EN AW-2219 can be considered challenging. In LBM of aluminium alloys, only easily-weldable Al?￠????Si casting alloys have succeeded commercially today. This article discusses the influences of boundary conditions during LBM of EN AW-2219 on sample porosity and tensile test results, supported by metallographic microsections and fractography. Load direction was varied relative to LBM build-up direction. T6 heat treatment was applied to half of the samples. Pronounced anisotropy was observed. Remarkably, elongation at break of T6 specimens loaded along the build-up direction exceeded the values from literature for conventionally manufactured EN AW-2219 by a factor of two.
机译：增材制造特别适用于具有通过金丝线几何形状实现的集成和优化功能的复杂形状的3D零件。这种设计得益于机械布局中的低安全系数。这就要求韧性材料通过可预测的塑性变形而不是破坏来降低应力峰值。铝铜锻造合金是满足该要求的既定材料。另外，它们提供高的比强度。作为名称？锻合金？这意味着它们是通过热加工或冷加工制造的。当铸造或焊接时，它们易于凝固裂纹。 Al-Si-Si填充剂可以减轻这种情况，但会损害延展性。与焊接密切相关的是，像EN AW-2219这样的Al铜Cu锻合金的粉末床（LBM）激光束熔化技术被认为具有挑战性。在铝合金的LBM中，只有易焊接的Al 2 Si 3铸造合金今天在商业上取得了成功。本文讨论了金相显微切片和断口扫描技术支持的EN AW-2219的LBM过程中的边界条件对样品孔隙率和拉伸测试结果的影响。负载方向相对于LBM堆积方向有所变化。 T6热处理应用于一半样品。观察到明显的各向异性。值得注意的是，沿堆积方向加载的T6试样的断裂伸长率比传统制造的EN AW-2219的文献记载值高两倍。

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