Comparison of Microstructure and Mechanical Properties of Scalmalloy(®) Produced by Selective Laser Melting and Laser Metal Deposition.
Comparison of Microstructure and Mechanical Properties of Scalmalloy(®) Produced by Selective Laser Melting and Laser Metal Deposition.
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DOI：
10.3390/ma11010017
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发表时间：
2017-12-23
期刊：
影响因子：
--
通讯作者：
Walther F
中科院分区：
文献类型：
--
作者：
Awd M;Tenkamp J;Hirtler M;Siddique S;Bambach M;Walther F
第二代铝镁钪(Al-Mg-Sc)合金，通常被称为ScalMalloy®，是一种用于选择性激光熔凝(SLM)的高强度铝合金。SLM过程中熔池的高冷却速度为细晶无裂纹的铝组织提供了热力学条件，该组织中充满了陶瓷相Al3-Sc的细小析出物。析出物使ScalMalloy®的抗拉强度和疲劳强度超过AlSi10 MG约70%。关于冷却速度较慢的其他添加剂制造工艺的性质的知识目前尚不清楚。在这项研究中，比较了两批经过SLM和激光金属沉积(LMD)处理的ScalMalloy®的显微组织诱导性能。用扫描电子显微镜(SEM)研究了强塑性增强背后的组织强化机制。从低周疲劳(LCF)到高周疲劳(HCF)的疲劳损伤机制是采用实验和统计建模相结合的策略来计算各自区域内的Woehler曲线的研究对象。X射线计算机层析成像(µ-CT)平台中的无损缺陷表征支持建模工作。研究表明，与SLM试件相反，LMD生产的ScalMalloy®试件容易产生较大的气孔率，这意味着疲劳强度降低约30%。
The second-generation aluminum-magnesium-scandium (Al-Mg-Sc) alloy, which is often referred to as Scalmalloy®, has been developed as a high-strength aluminum alloy for selective laser melting (SLM). The high-cooling rates of melt pools during SLM establishes the thermodynamic conditions for a fine-grained crack-free aluminum structure saturated with fine precipitates of the ceramic phase Al3-Sc. The precipitation allows tensile and fatigue strength of Scalmalloy® to exceed those of AlSi10Mg by ~70%. Knowledge about properties of other additive manufacturing processes with slower cooling rates is currently not available. In this study, two batches of Scalmalloy® processed by SLM and laser metal deposition (LMD) are compared regarding microstructure-induced properties. Microstructural strengthening mechanisms behind enhanced strength and ductility are investigated by scanning electron microscopy (SEM). Fatigue damage mechanisms in low-cycle (LCF) to high-cycle fatigue (HCF) are a subject of study in a combined strategy of experimental and statistical modeling for calculation of Woehler curves in the respective regimes. Modeling efforts are supported by non-destructive defect characterization in an X-ray computed tomography (µ-CT) platform. The investigations show that Scalmalloy® specimens produced by LMD are prone to extensive porosity, contrary to SLM specimens, which is translated to ~30% lower fatigue strength.
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