Parameter optimization and microhardness experiment of AlSi10Mg alloy prepared by selective laser melting
Parameter optimization and microhardness experiment of AlSi10Mg alloy prepared by selective laser melting
复制标题
选区激光熔化AlSi10Mg合金参数优化及显微硬度实验
DOI：
10.1088/2053-1591/ab18d0
复制
发表时间：
2019-08-01
影响因子：
2.3
通讯作者：
Jiang, Linzhi
中科院分区：
文献类型：
--
作者：
Teng, Xiao;Zhang, Guixiang;Jiang, Linzhi
选择性激光熔化（SLM）制备的AlSi 10 Mg合金在航空航天和汽车工业中具有很大的应用潜力。然而，工艺参数诱导的密度和微观结构将对材料性能产生重大影响。采用阿基米德排水法、硬度计、金相显微镜和扫描电镜对试样的密度、硬度、显微组织和晶粒形貌进行了测定。研究发现，AlSi 10 Mg试样的密度与维氏硬度成正比。在激光能量密度（LED）为48-63 J·mm~（-3）的范围内，获得了最佳的密度（2.676 g·cm~（-3））和维氏硬度（115.92 HV）。X-Z截面熔池在水平方向上的显微硬度变化趋势波动较大。垂直方向越靠近熔池下边界，显微硬度值越低，这是由于显微组织引起的显微硬度差异。因此，高致密度和细晶组织对提高材料性能具有重要意义。
AlSi10Mg alloy processed by selective laser melting (SLM) has a high potential for the aerospace and auto industry. However, the process parameters induced density and microstructure will have a significant impact on material properties. The samples density, hardness, microstructure, and grain morphology were measured by the Archimedes drainage method, hardness tester, microscope, and SEM. This work has found that the density of the AlSi10Mg sample is directly proportional to the Vickers hardness. The optimum density (2.676 g cm(-3)) and Vickers hardness (115.92 HV) are obtained in the range of laser energy density (LED) of 48-63 J mm(-3). The microhardness variation trend of the X-Z cross-section molten pool in the horizontal direction fluctuates greatly. The closer the vertical direction is to the lower boundary of the molten pool, the lower the microhardness value, which is due to the difference in microhardness caused by the microstructures. Therefore, high density and fine microstructure are of great significance to improve material performance.