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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Mechanisms of laser energy absorption and melting behavior during selective laser melting of titanium-matrix composite: role of ceramic addition
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Mechanisms of laser energy absorption and melting behavior during selective laser melting of titanium-matrix composite: role of ceramic addition

机译：钛 - 基质复合材料选择性激光熔化过程中激光能量吸收和熔化的机理：陶瓷添加的作用

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摘要

The laser energy absorption and melting behavior of ceramic reinforced metal matrix composites during selective laser melting (SLM) additive manufacturing are vital for the subsequent metallurgical behavior. In this study, the mesoscopic simulation was proposed to investigate the influence of ceramic addition on the laser energy absorption and powder melting behaviors during SLM of TiC/Ti6Al4V composites. As the addition of TiC particles increased from 0 wt.% to 5 wt.%, the packing density of composite powder increased from 2.357 g cm(-3) to 2.588 g cm(-3), while the hall velocity decreased from 36.00 s to 73.14 s, indicating the powder flowability decreased with the ceramic addition. Meanwhile, the number of laser-powder interactions increased from 1.267 x 10(6) to 1.626 x 10(6), thereby enhancing the laser multiple reflection phenomenon in the powder bed. The concentrated irradiance distribution on the metal powder was dispersed into the surrounding powder. The average irradiance intensity on TiC particles was continuously improved, which increased the overall laser absorptivity from 0.655 to 0.72, yielding an elevated maximum operating temperature within the molten pool from 3501 K to 3668 K. However, with the excessive addition of ceramics (5 wt.%), balls and trapped unmelted particles deteriorated the surface morphology of the melted track. It can be attributed to the high required energy for complete melted TiC and the elevated difficulty of completely wetting unmelted particles. These results provided the physical understanding of high-quality and defect-free components of SLM processed composite materials.
机译：陶瓷增强金属基复合材料在选择性激光熔化（SLM）添加剂制造过程中的激光能量吸收和熔化行为对后续的冶金行为至关重要。本研究采用细观模拟方法研究了陶瓷添加量对TiC/Ti6Al4V复合材料激光能量吸收和粉末熔化行为的影响。随着TiC颗粒的加入量从0%增加到5%，复合粉末的堆积密度从2.357 g cm（-3）增加到2.588 g cm（-3），而霍尔速度从36.00 s降低到73.14 s，表明随着陶瓷的加入，粉末的流动性降低。同时，激光-粉末相互作用的数量从1.267x10（6）增加到1.626x10（6），从而增强了粉末床中的激光多次反射现象。金属粉末上的集中辐照度分布分散到周围粉末中。TiC颗粒上的平均辐照强度不断提高，从而将整体激光吸收率从0.655提高到0.72，使熔池内的最高工作温度从3501 K提高到3668 K。然而，随着陶瓷（5 wt.%）的过量添加，球和捕获的未熔化颗粒恶化了熔化轨道的表面形态。这可以归因于完全熔化的TiC所需的高能量，以及完全润湿未熔化颗粒的难度增加。这些结果提供了对SLM加工复合材料的高质量和无缺陷组件的物理理解。

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    Ge Qing; Gu Dongdong; Dai Donghua; Ma Chenglong; Sun Yixuan; Shi Xinyu; Li Yanze; Zhang Hongmei; Chen Hongyu;

  • 作者单位

    Nanjing Univ Aeronaut &

    Astronaut NUAA Coll Mat Sci &

    Technol Yudao St 29 Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut NUAA Coll Mat Sci &

    Technol Yudao St 29 Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut NUAA Coll Mat Sci &

    Technol Yudao St 29 Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut NUAA Coll Mat Sci &

    Technol Yudao St 29 Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut NUAA Coll Mat Sci &

    Technol Yudao St 29 Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut NUAA Coll Mat Sci &

    Technol Yudao St 29 Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut NUAA Coll Mat Sci &

    Technol Yudao St 29 Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut NUAA Coll Mat Sci &

    Technol Yudao St 29 Nanjing 210016 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut NUAA Coll Mat Sci &

    Technol Yudao St 29 Nanjing 210016 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 应用物理学;
  • 关键词

    selective laser melting; titanium matrix composite; laser absorption; mesoscopic simulation; ray-tracing model;

    机译：选择性激光熔化;钛基质复合材料;激光吸收;介观模拟;射线跟踪模型;

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