脉冲激光熔化作用下3D打印Al-12%Si合金组织演变分析

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.

参考文献

[1] 王小艳, 陈静, 林鑫, 等.AlSi12粉激光成形修复7050铝合金组织［J］.中国激光, 2009(6): 1585-1590.

[2] SIDDIQUE S, IMRAN M, WYCISK E, et al.Influence of process-induced microstructure and imperfections on mechanical properties of AlSi12 processed by selective laser melting［J］.Journal of Materials Processing Technology, 2015(221): 205-213.

[3] SONG M H, LIN X, YANG G L, et al.Influence of forming atmosphere on the deposition characteristics of 2Cr13 stainless steel during laser solid forming［J］.Journal of Materials Processing Technology, 2014, 214(3): 701-709.

[4] LIU F C, LIN X, HUANG C P, et al.The effect of laser scanning path on microstructures and mechanical properties of laser solid formed nickel-base superalloy Inconel 718［J］.Journal of Alloys and Compounds, 2011, 509(13): 4505-4509.

[5] LI X, GAGNOUD A, FAUTRELLE Y, et al.Dendrite fragmentation and columnar-to-equiaxed transition during directional solidification at lower growth speed under a strong magnetic field ［J］.Acta Materialia, 2012, 60(8): 3321-3332.

[6] XUAN W D, REN Z M, LI C J, et al.Effect of a high magnetic field on microstructures of Ni-based superalloy during directional solidification［J］.Journal of Alloy and Compounds, 2015, 620: 10-17.

[7] 王长久, 董蒙, 刘铁, 等.强磁场对Al-7%Si合金凝固过程中初生α-Al枝晶分布的影响［J］.材料导报, 2016, 30(2): 90-94.

[8] 王维, 才磊, 杨光, 等.激光熔覆同轴送粉喷嘴研制［J］.中国激光, 2012(4): 67-73.

[9] DINDA G P, DASGUPTA A K, BHATTACHARYA S, et al.Microstructural characterization of laser-deposited Al 4047 alloy［J］.Metallurgical and Materials Transactions A, 2013, 44(5): 2233-2242.

[10] DINDA G P, DASGUPTA A K, MAZUMDER J.Evolution of microstructure in laser deposited Al-11.28%Si alloy ［J］.Surface and Coatings Technology, 2012, 206(8-9): 2152-2160.

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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