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
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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DOI：
10.3390/mi8010023
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发表时间：
2017-01-16
期刊：
影响因子：
3.4
通讯作者：
Schmidt M
中科院分区：
文献类型：
--
作者：
Karg MC;Ahuja B;Wiesenmayer S;Kuryntsev SV;Schmidt M
增材制造特别适用于复杂形状的3D零件，通过细丝几何形状实现集成和优化的功能。这种设计得益于机械布局的低安全系数。这就要求延展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。铝铜变形合金是满足这一要求的成熟材料。此外，它们还具有很高的比强度。正如“锻造合金”的名称所暗示的那样，它们是用于热加工或冷加工的。在铸造或焊接时，它们容易产生凝固裂纹。铝硅填料可以缓解这种情况，但会损害延展性。与焊接密切相关的Al-Cu变形合金（如EN AW-2219）的粉末床激光熔化是一项具有挑战性的工作。在铝合金的LBM中，目前只有易于焊接的Al-Si铸造合金在商业上取得了成功。本文结合金相显微切片和断口分析，讨论了铝合金AW-2219熔覆过程中边界条件对试样孔隙率和拉伸试验结果的影响。载荷方向随LBM堆积方向变化。对一半样品进行T6热处理。观察到明显的各向异性。值得注意的是，沿着堆积方向加载的T6试件的断裂伸长率超过了传统制造的EN AW-2219的文献值的两倍。
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.
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影响因子：
8.4
作者：
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通讯作者：
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影响因子：
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影响因子：
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DOI：
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发表时间：
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影响因子：
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作者：
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通讯作者：
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