金属粉末特性对选区激光熔化工艺及其制件性能影响

李克峰; 施麒; 毛新华; 谭冲; 刘辛

doi:10.19591/j.cnki.cn11-1974/tf.2020060005

金属粉末特性对选区激光熔化工艺及其制件性能影响

李克峰^{1, 2, 3},
施麒^{1, 2, 3},
毛新华^{1, 2, 3},
谭冲^{1, 2, 3},
刘辛^{1, 2, 3, ,}

1.
广东省科学院新材料研究所, 广州 510650
2.
广东省金属强韧化技术与应用重点实验室, 广州 510650
3.
国家钛及稀有金属粉末冶金工程技术研究中心, 广州 510650

基金项目: 广州市科技计划资助项目（201906040007）；广东省自然科学基金资助项目（2018A030313127）；广东省科学院院属骨干科研机构创新能力建设专项资助项目（2018GDASCX-0117）

详细信息

通讯作者:
刘辛: E-mail: liuxin@gdinm.com

中图分类号: TF122
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出版历程
- 收稿日期: 2020-06-04
- 录用日期: 2020-08-30
- 网络出版日期: 2022-07-09
- 刊出日期: 2022-12-27

Effect of metallic powder properties on selective laser melting technology and component performances

LI Ke-feng^{1, 2, 3},
SHI Qi^{1, 2, 3},
MAO Xin-hua^{1, 2, 3},
TAN Chong^{1, 2, 3},
LIU Xin^{1, 2, 3, ,}

1.
Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China
2.
Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou 510650, China
3.
National Engineering Research Centre of Powder Metallurgy of Titanium & Rare Metals, Guangzhou 510650, China

More Information

Corresponding author:
LIU Xin: E-mail: liuxin@gdinm.com

摘要

摘要:
高品质金属粉末是选区激光熔化（selective laser melting，SLM）制备高性能制件的重要基础。粉体特性对选区激光熔化技术的影响及其机理研究是理解选区激光熔化技术不可或缺的重要组成部分。本文从粉末物理和化学特性出发，论述了粉末特性对选区激光熔化工艺、制件微观组织与性能的影响。结果表明，粉末的物理特性，尤其是粉末形貌和粉末粒度分布能显著影响其流动性和粉末床堆密度等关键工艺特性；而粉末的化学成分，特别是杂质成分，是影响制件相组成和微观组织的重要因素。在此基础上，本文进一步介绍了选区激光熔化过程中高能量源与粉末颗粒的冶金作用机理研究进展。
- 选区激光熔化 /
- 粉末特性 /
- 粉末形貌 /
- 粒度分布 /
- 化学成分
Abstract:
High-quality metallic powders are essential for the selective laser melting (SLM) technology. The powder characteristics are indispensible for the understanding of SLM technology. The influences of powder physical and chemical characteristics on SLM processing, component microstructure, and mechanical properties were reviewed in this work. For the physical properties, the powder morphology and powder size distribution could significantly influence the powder flowability and powder-bed packing density, which were vital for the subsequent laser melting. On the other hand, the chemical compositions, especially the contents of impurities, determined the phase constitutes and microstructures. Furthermore, the recent progress on the interaction between laser and powder and the corresponding metallurgical mechanism were also introduced.
- selective laser melting /
- powder characteristics /
- powder morphology /
- size distribution /
- chemical composition

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图 1 不同粉末制备技术制备的Ti‒6Al‒4V合金粉末形貌^[5]

Figure 1. Morphologies of the Ti‒6Al‒4V powders fabricated by the various methods^[5]

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图 2 气雾化与水雾化316L不锈钢粉末形貌及打印样件截面组织图^[6]

Figure 2. GA and WA powder morphologies and the cross-sectional microstructures of the 316L stainless steels^[6]

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图 3 Inconel 718合金粉末形貌^[11]：（a）原始粉末；（b）循环使用10次后粉末

Figure 3. Morphologies of the Inconel 718 alloy powders^[11]: (a) the virgin powders; (b) the powders after 10-time-cycle

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图 4 不同粒径分布的316L粉末松装密度及粉床密度^[14]

Figure 4. Apparent density and powder bed density of the 316L powders in different size distributions and the as-SLM samples^[14]

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图 5 不同粉末供应商提供的Ti‒6Al‒4V粉末粒径分布^[15]

Figure 5. Powder size distributions of the Ti‒6Al‒4V alloy powders from the different vendors^[15]

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图 6 相同打印参数下不同Ti‒6Al‒4V粉末选区激光熔化打印样品显微形貌^[15]

Figure 6. Microstructures of the SLM Ti‒6Al‒4V alloys using the same processing parameters^[15]

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图 7 不同粒度分布的316L不锈钢粉末在不同激光能量密度下零件的相对密度^[18]

Figure 7. Relative densities of the samples in the different laser energy densities using 316L alloy powders in the different powder size distributions^[18]

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图 8 热成像相机拍摄的不同Ti‒6Al‒4V粉末床静态热传导状态^[15]

Figure 8. Static thermal conducting images of the various of Ti‒6Al‒4V powder beds^[15]

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图 9 选区激光熔化制备不同粒径分布Co‒Cr‒W合金退火后样品电子背散射衍射微观组织分析^[21]

Figure 9. Electron back-scattered diffraction analysis of the Co‒Cr‒W alloys after heat treatment prepared by SLM using the powders with the different particle size distribution^[21]

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图 10 316L不锈钢粉末粒径分布（a）及其选区激光熔化制件力学性能（b）^[22]

Figure 10. Particle size distribution of the 316L powders (a) and the tensile properties of the corresponding SLM samples (b)^[22]

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图 11 不同粒径分布对选区激光熔化打印过程中熔池的影响^[17]：（a）采用细粒径粉末的熔池形貌平滑；（b）采用粗粒径粉末的熔池边缘轮廓波动较大

Figure 11. Powder size effect on the configuration of melting pool during the SLM process^[17]: (a) smooth boundary with the fine powders; (b) rough boundary with the coarse powders

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图 12 不同供应商Ti‒6Al‒4V粉末的休止角（a）与粉末床密度（b）^[15]

Figure 12. AOR (a) and PBD (b) of the Ti‒6Al‒4Vpowders from the different vendors^[15]

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图 13 23种选区激光熔化用金属光学粉末流动性评价指标^[23]：（a）豪斯纳比；（b）体积膨胀率

Figure 13. Optical evaluated flowability for the SLM powders^[23]: (a) Hausner ratio; (b) volume expansion ratio

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图 14 激光与材料相互作用示意图^[33]

Figure 14. Interactions between high energy laser and working materials^[33]

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图 15 基于第一性原理射线追踪模型（a）及其局部细节（b）和粒度分布对激光吸收系数的影响（c）^[34]

Figure 15. Ray-tracing model (a), the local reflection details (b), and the effect of powder size distribution on the laser absorptivity (c)^[34]

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图 16 粉末熔化和熔池凝固3D模拟模型^[16]

Figure 16. Multiphysics simulations on the powder melting and melting pool solidification^[16]

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图 17 原位X射线高速成像技术观察激光与粉末相互作用及其对组织的影响^[36]

Figure 17. In-situ X-ray imaging of the laser-powder interactions and the consequent effects on the microstructures^[36]

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