Influence of Annealing on Mechanical Properties of Al-20Si Processed by Selective Laser Melting
Influence of Annealing on Mechanical Properties of Al-20Si Processed by Selective Laser Melting
复制标题
退火对选区激光熔化Al-20Si力学性能的影响
DOI：
10.3390/met4010028
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发表时间：
2014-03-01
期刊：
影响因子：
2.9
通讯作者：
Eckert, Juergen
中科院分区：
文献类型：
--
作者：
Ma, Pan;Prashanth, Konda G.;Eckert, Juergen
研究了选择性激光熔凝Al-20Si合金在不同热处理条件下的组织和性能。由于在加工过程中的高冷却速度，所制备的SLM材料呈现出由过饱和的Al(Si)固溶体以及高度细化的共晶硅和硅颗粒组成的显微组织。随着退火温度的升高，硅颗粒变粗，共晶硅逐渐由纤维状转变为片状。热处理过程中出现的显微组织变化显著影响了样品的力学行为。在673K条件下，SLM材料的屈服强度和极限强度分别从374和506 Mpa下降到162和252 Mpa，延伸率从1.6%提高到8.7%。这为调整Al-20Si SLM零件的组织和相应的性能以满足特定要求提供了可能性。
The microstructure and mechanical properties of Al-20Si produced by selective laser melting (SLM) are investigated for different heat treatment conditions. As a result of the high cooling rate during processing, the as-built SLM material displays a microstructure consisting of a supersaturated Al(Si) solid solution along with heavily refined eutectic Si and Si particles. The Si particles become coarser, and the eutectic Si gradually changes its morphology from fibrous to plate-like shape with increasing annealing temperature. The microstructural variations occurring during heat treatment significantly affect the mechanical behavior of the samples. The yield and ultimate strengths decrease from 374 and 506 MPa for the as-built SLM material to 162 and 252 MPa for the sample annealed at 673 K, whereas the ductility increases from 1.6 to 8.7%. This offers the possibility to tune microstructure and corresponding properties of the Al-20Si SLM parts to meet specific requirements.