Pan Wei, Ye Zhanggen, Zhang Yongzhong, Liu Yantao, Liang Bo, Zhai Ziyu
National Engineering & Technology Research Center for Non-Ferrous Metals Composites, GRINM Group Corporation Limited, Beijing 101407, China.
GRINM Metal Composites Technology Co., Ltd., Beijing 101407, China.
Materials (Basel). 2022 Mar 30;15(7):2528. doi: 10.3390/ma15072528.
In order to obtain high-performance aluminum alloy parts fabricated by selective laser melting, this paper investigates the relationship between the process parameters and microstructure properties of AlSi10Mg. The appropriate process parameters are obtained: the layer thickness is 0.03 mm, the laser power is 370 W, the scanning speed is 1454 mm/s, and the hatch spacing is 0.16 mm. With these process parameters, the ultimate tensile strength of the as-printed status is 500.7 ± 0.8 MPa, the yield strength is 311.5 ± 5.9 MPa, the elongation is 7.7 ± 0.5%, and the relative density is 99.94%. After annealing treatment at 275 °C for 2 h, the ultimate tensile strength is 310.8 ± 1.3 MPa, the yield strength is 198.0 ± 2.0 MPa, and the elongation is 13.7 ± 0.6%. The mechanical properties are mainly due to the high relative density, supersaturate solid solution, and fine dispersed Si. The supersaturate solid solution and nano-sized Si formed by the high cooling rate of SLM. After annealing treatment, the Si have been granulated and grown significantly. The ultimate tensile strength and yield strength are reduced, and the elongation is significantly improved.
为了获得通过选择性激光熔化制造的高性能铝合金零件，本文研究了AlSi10Mg的工艺参数与微观结构性能之间的关系。获得了合适的工艺参数：层厚为0.03mm，激光功率为370W，扫描速度为1454mm/s，扫描间距为0.16mm。采用这些工艺参数，打印状态下的极限抗拉强度为500.7±0.8MPa，屈服强度为311.5±5.9MPa，伸长率为7.7±0.5%，相对密度为99.94%。在275℃退火2h后，极限抗拉强度为310.8±1.3MPa，屈服强度为198.0±2.0MPa，伸长率为13.7±0.6%。力学性能主要归因于高相对密度、过饱和固溶体和细小弥散的Si。SLM的高冷却速率形成了过饱和固溶体和纳米尺寸的Si。退火处理后，Si已颗粒化并显著长大。极限抗拉强度和屈服强度降低，伸长率显著提高。
