应用激光, 2019, 39 (1): 68, 网络出版: 2019-04-16   

脉冲激光熔化作用下3D打印Al-12%Si合金组织演变分析

Microstructure Evolution Analysis of 3D Printing Al-12%Si Alloy under Pulsed Laser Melting
冯哲 1,*靳远 2
作者单位
1 赤峰工业职业技术学院, 内蒙古 赤峰 024000
2 山东省科学院激光研究所, 山东 济南 250000
摘要
通过送粉式激光熔化3D打印装置在6063铝合金作基板上打印粒径尺寸50~100 μm的Al-12%Si合金粉末, 研究有/无横向稳恒磁场下3D打印Al-12%Si合金组织演变规律。研究结果表明, 激光熔化得到的沉积试样表现出明显层状堆积特征, 组织中包含亮白色的α-Al相与Al-Si共晶相以及部分颜色较暗的α-Al相共同叠加组成, 试样致密度达到94%。在磁场强度为0.5 T下, 试样的底部区域形成了珠界面以及边缘生成了众多的等轴状α-Al相, 磁场具有能够使柱状晶转变为等轴晶的作用且能够使α-Al相从柱状晶转变为等轴晶, 并形成高次枝晶臂。
Abstract
The Al-12%Si alloy powder with particle size of 50~100 μm was printed on 6063 aluminum alloy substrate by powder feeding laser melting 3D printing device. The microstructure evolution of 3D printing Al-12%Si alloy with/without transverse steady magnetic field was studied. The results show that the deposited samples obtained by laser melting show obvious laminar accumulation characteristics, and the composition contains a bright white α-Al phase and an Al-Si eutectic phase and a part of the darker α-Al phase, and the sample density reaches 94%. At the magnetic field strength of 0.5 T, the bead interface is formed in the bottom region of the sample and a plurality of equiaxed α-Al phases are formed at the edges. The magnetic field has the effect of converting the columnar crystals into equiaxed crystals. Moreover, the α-Al phase can be converted from a columnar crystal to an equiaxed crystal, and a high-order dendritic arm can be formed.

冯哲, 靳远. 脉冲激光熔化作用下3D打印Al-12%Si合金组织演变分析[J]. 应用激光, 2019, 39(1): 68. Feng Zhe, Jin Yuan. Microstructure Evolution Analysis of 3D Printing Al-12%Si Alloy under Pulsed Laser Melting[J]. APPLIED LASER, 2019, 39(1): 68.

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