铝合金激光增材制造支撑布局及精确成形机制

doi:10.7527/S1000-6893.2021.25331

Abstract

Abstract: Most of the complex components applied in the aerospace field need to add support structures in the selective laser melting process, and the block support structure is the most widely used one. To determine the reasonable support spacing and the post-processing allowance of the overhang surface, the influence of support spacing on the relative density, surface morphology, microstructure and hardness of the selective laser melted AlSi10Mg material is studied, and the influence mechanism of the support structure on the formability of the material is revealed through numerical simulation. The results show that the average relative density of the samples varied from 96.7% to 97.3%. When the support spacing is less than 1 mm, the roughness of the lower surface of the samples maintained to be about 0.28 mm after the support is removed. The start few layers of the samples can be divided into the defect area, transition area, and dense area. When the support spacing was less than 1 mm, the thickness of the defect area is maintained to be about 456 μm. The network Si phase in the defect area is coarse and sparse, with a microhardness of 90 HV_0.1, while in the dense area, the network Si phase is fine and dense, with a microhardness of 115 HV_0.1. The support structure can effectively prevent the molten metal from invading the lower layer powder, and maintain the normal shape of the molten pool (the maximum length is 190 μm, and the maximum width is 100 μm), which is conducive to the full melting of the metal powder in the molten channel to ensure the formability of the material. In laser additive manufacturing of aluminum alloy complex components, setting the optimal support spacing to 1 mm can reduce material waste and processing time. If the machining allowance is set to 456 μm for the overhang surface of the complex component, the defect area can be removed in post-processing to ensure the dimensional accuracy and performance of the component, and precise laser forming can then be realized.

Key words: selective laser melting, AlSi10Mg, support structure, microstructure, microhardness, numerical simulation

CLC Number:

V261.8

YANG Jiankai, GU Dongdong, GE Qing, TAN Chenchen, WEN Yu. Support layout and precise forming mechanism of aluminum alloy for laser additive manufacturing[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(4): 525331-525331.

References

[1] 卢秉恒, 李涤尘. 增材制造(3D打印)技术发展[J]. 机械制造与自动化, 2013, 42(4):1-4. LU B H, LI D C. Development of the additive manufacturing (3D printing) technology[J]. Machine Building & Automation, 2013, 42(4):1-4(in Chinese).
[2] 王华明. 高性能大型金属构件激光增材制造:若干材料基础问题[J]. 航空学报, 2014, 35(10):2690-2698. WANG H M. Materials'fundamental issues of laser additive manufacturing for high-performance large metallic components[J]. Acta Aeronautica et Astronautica Sinica, 2014, 35(10):2690-2698(in Chinese).
[3] 顾冬冬, 张红梅, 陈洪宇, 等. 航空航天高性能金属材料构件激光增材制造[J]. 中国激光, 2020, 47(5):32-55. GU D D, ZHANG H M, CHEN H Y, et al. Laser additive manufacturing of high-performance metallic aerospace components[J]. Chinese Journal of Lasers, 2020, 47(5):32-55(in Chinese).
[4] 林鑫, 黄卫东. 高性能金属构件的激光增材制造[J]. 中国科学:信息科学, 2015, 45(9):1111-1126. LIN X, HUANG W D. Laser additive manufacturing of high-performance metal components[J]. Science China:Information Science, 2015, 45(9):1111-1126(in Chi- nese).
[5] 杨永强, 陈杰, 宋长辉, 等. 金属零件激光选区熔化技术的现状及进展[J]. 激光与光电子学进展, 2018, 55(1):9-21. YANG Y Q, CHEN J, SONG C H, et al. Current status and progress on technology of selective laser melting of metal parts[J]. Laser & Optoelectronics Progress, 2018, 55(1):9-21(in Chinese).
[6] 曹龙超, 周奇, 韩远飞, 等. 激光选区熔化增材制造缺陷智能监测与过程控制综述[J]. 航空学报, 2021,42(10):524790. CAO L C, ZHOU Q, HAN Y F, et al. Review on intelligent monitoring of defects and process control of selective laser melting additive manufacturing[J]. Acta Aeronautica et Astronautica Sinica, 2021,42(10):524790(in Chinese).
[7] 郭鑫鑫, 陈哲涵. 激光增材制造过程数值仿真技术综述[J]. 航空学报, 2021,42(10):524227. GUO X X, CHEN Z H. Numerical simulation of laser additive manufacturing process:A review[J]. Acta Aeronautica et Astronautica Sinica, 2021,42(10):524227(in Chinese).
[8] 顾冬冬, 张晗, 刘刚, 等. 稀土改性高强铝微桁架激光增材制造工艺调控[J]. 航空学报, 2021,42(10):524868. GU D D, ZHANG H, LIU G, et al. Process optimization of additive manufactured sandwich panel structure using rare earth element modified high-performance Al alloy[J]. Acta Aeronautica et Astronautica Sinica, 2021,42(10):524868(in Chinese).
[9] 张国庆, 杨永强, 张自勉, 等. 激光选区熔化成型零件支撑结构优化设计[J]. 中国激光, 2016, 43(12):59-66. ZHANG G Q, YANG Y Q, ZHANG Z M, et al. Optimal design of support structures in selective laser melting of parts[J]. Chinese Journal of Lasers, 2016, 43(12):59-66(in Chinese).
[10] YANG J K, GU D D, LIN K J, et al. Laser 3D printed bio-inspired impact resistant structure:failure mechanism under compressive loading[J]. Virtual and Physical Prototyping, 2020, 15(1):75-86.
[11] LI Y X, GU D D, ZHANG H, et al. Effect of trace addition of ceramic on microstructure development and mechanical properties of selective laser melted AlSi10Mg alloy[J]. Chinese Journal of Mechanical Engineering, 2020, 33(2):33.
[12] GU D D, ZHANG H M, DAI D H, et al. Laser additive manufacturing of nano-TiC reinforced Ni-based nanocomposites with tailored microstructure and performance[J]. Composites Part B:Engineering, 2019, 163:585-597.
[13] ZHANG K F, FU G, ZHANG P, et al. Study on the geometric design of supports for overhanging structures fabricated by selective laser melting[J]. Materials, 2019, 12:27.
[14] BOBBIO L D, QIN S, DUNBAR A, et al. Characterization of the strength of support structures used in powder bed fusion additive manufacturing of Ti-6Al-4V[J]. Additive Manufacturing, 2017, 14:60-68.
[15] PAL S, LOJEN G, KOKOL V, et al. Reducing porosity at the starting layers above supporting bars of the parts made by selective laser melting[J]. Powder Technology, 2019, 355:268-277.
[16] LEARY M, MACONACHIE T, SARKER A, et al. Mechanical and thermal characterisation of AlSi10Mg SLM block support structures[J]. Materials and Design, 2019, 183:108138.
[17] PAULY S, WANG P, KUHN U, et al. Experimental determination of cooling rates in selectively laser-melted eutectic Al-33Cu[J]. Additive Manufacturing, 2018, 22:753-757.
[18] GAN M X, WONG C H. Practical support structures for selective laser melting[J]. Journal of Materials Processing Technology, 2016, 238:474-484.
[19] 洪军, 李涤尘, 唐一平, 等. 快速成型中的支撑结构设计策略研究[J]. 西安交通大学学报, 2000, 34(9):58-61. HONG J, LI D C, TANG Y P, et al. Design of RP support structure[J]. Journal of Xi'an Jiaotong University, 2000, 34(9):58-61(in Chinese).
[20] CAO Q Q, BAI Y C, ZHANG J, et al. Removability of 316L stainless steel cone and block support structures fabricated by Selective Laser Melting (SLM)[J]. Materials and Design, 2020, 191:108691.
[21] LIN K J, YUAN L H, GU D D. Influence of laser parameters and complex structural features on the bio-inspired complex thin-wall structures fabricated by selective laser melting[J]. Journal of Materials Processing Technology, 2019, 267:34-43.
[22] DAI D H, GU D D, GE Q, et al. Mesoscopic study of thermal behavior, fluid dynamics and surface morphology during selective laser melting of Ti-based composites[J]. Computational Materials Science, 2020, 177:109598.
[23] YANG Y, GU D D, DAI D H, et al. Laser energy absorption behavior of powder particles using ray tracing method during selective laser melting additive manufacturing of aluminum alloy[J]. Materials and Design, 2018, 143:12-19.
[24] DOU L, YUAN Z F, LI J Q, et al. Surface tension of molten Al-Si alloy at temperatures ranging from 923 to 1123 K[J]. Chinese Science Bulletin, 2008, 53(17):2593-2598.
[25] KRUTH J P, LEVY G, KLOCKE F, et al. Consolidation phenomena in laser and powder-bed based layered manufacturing[J]. CIRP Annals-Manufacturing Technology, 2007, 56(2):730-759.
[26] CHEN H Y, GU D D, XIONG J P, et al. Improving additive manufacturing processability of hard-to-process overhanging structure by selective laser melting[J]. Journal of Materials Processing Technology, 2017, 250:99-108.

Support layout and precise forming mechanism of aluminum alloy for laser additive manufacturing

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