Selective laser melting of aluminum die-cast alloy-Correlations between process parameters, solidification conditions, and resulting mechanical properties
Selective laser melting of aluminum die-cast alloy-Correlations between process parameters, solidification conditions, and resulting mechanical properties
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DOI：
10.2351/1.4906389
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发表时间：
2015-02-01
影响因子：
2.1
通讯作者：
Poprawe, R.
中科院分区：
文献类型：
--
作者：
Buchbinder, D.;Meiners, W.;Poprawe, R.
添加生产技术选择性激光熔化(SLM)用于金属基功能元件的直接制造。SLM是一种基于粉床的AM技术。SLM在用于牙齿修复和工具的系列生产中得到了很好的确立。工业应用的主要关注点仍然是可加工材料的范围和由此产生的机械性能。对于铝合金的加工，商业上可用的系统在所应用的工艺参数和由此产生的机械性能方面具有可比性，这仍然是一个挑战。通常没有关于工艺参数和机械性能的数据。这一点尤其适用于高功率SLM系统，由于激光功率扩展到高达1 kW，因此提高了构建速度。特别是在铝合金加工过程中，凝固条件对枝晶和晶粒度的影响很大。因此，本文系统地研究和关联了工艺参数(如激光功率、扫描速度、层取向、预热等)。对铝压铸合金的微观组织(电子背散射衍射和织构)和由此产生的机械性能(硬度、拉伸强度、屈服强度和断裂伸长率)的影响。在这一点上，进一步说明了通常观察到的力学性能依赖于层取向的各向异性的潜在现象。(C)2015年美国激光学会。
The additive production technology selective laser melting (SLM) is used for direct fabrication of metal-based functional components. SLM is one of the powder-bed based AM technologies. SLM is well established in serial production for dental restoration as well as for tooling. Main concern for industrial application remains the scope of processible materials and resulting mechanical properties. Toward processing of aluminum alloys commercially available systems exist with comparability in terms of applied process parameters and resulting mechanical properties remaining a challenge. Often no data are available concerning process parameters and mechanical properties. This holds especially for high-power SLM systems with increased build rates as a result of extended laser powers of up to 1 kW. Especially when processing aluminum alloys, the solidification conditions significantly affect the resulting microstructure in terms of size of dendrites and grains. Consequently, the present paper systematically investigates and correlates the process parameters (e.g., laser power, scan speed, layer orientation, preheating, etc.) on the microstructure (electron backscatter diffraction and texture) and resultant mechanical properties (hardness, tensile strength, yield strength, and breaking elongation) for aluminum die-cast alloys. At this, underlying phenomena for typically observed anisotropy of mechanical properties in dependence on layer orientation are further specified. (C) 2015 Laser Institute of America.