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首页> 外文期刊>Journal of Materials Research >Selective laser melting manufactured CNTs/AZ31B composites: Heat transfer and vaporized porosity evolution
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Selective laser melting manufactured CNTs/AZ31B composites: Heat transfer and vaporized porosity evolution

机译：选择性激光熔融制造的CNTs / AZ31B复合材料：传热和气化孔隙的形成

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摘要

In this research, heat transfer analysis was operated by simulation to investigate the influence of carbon nanotubes (CNTs) on laser absorption and molten pool characteristic as well as the vaporization porosity of a typical magnesium alloy of AZ31B in the selective laser melting (SLM) process. It is concluded that the laser absorption is enhanced by 7.9% through mixing 1.5 wt% CNTs into AZ31B alloy powders. The full melting state of molten pools for CNTs/AZ31B composites was achieved by laser input energy densities (LIEDs) larger than 42 J/mm(3). However, vaporization porosity has an ascendent tendency with LIED increasing, which leads to poor densities of manufactured parts. As a result, the optimal relative density and mechanical properties of composites are obtained by an LIED of 42 J/mm(3). It may solve the problem of low laser absorption in laser processing for magnesium alloys and provide a referenced method to evaluate the vaporization porosity of the material in the SLM process.
机译：在这项研究中，通过模拟进行传热分析，以研究碳纳米管（CNTs）对选择性激光熔化（SLM）过程中典型AZ31B镁合金的激光吸收和熔池特性以及汽化孔隙率的影响。 。结论是，通过将1.5 wt％的CNT混合到AZ31B合金粉末中，激光吸收提高了7.9％。 CNTs / AZ31B复合材料熔池的完全熔融状态是通过大于42 J / mm（3）的激光输入能量密度（LIEDs）实现的。然而，随着LIED的增加，气化孔隙率具有上升的趋势，这导致制造零件的密度差。结果，通过42 J / mm（3）的LIED获得了复合材料的最佳相对密度和机械性能。它可以解决镁合金激光加工中激光吸收率低的问题，为评估SLM工艺中材料的气化孔隙率提供参考方法。

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  • 来源
    《Journal of Materials Research》 |2018年第18期|2752-2762|共11页
  • 作者

    Wu Jiaojiao; Wang Linzhi;

  • 作者单位

    Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    composite; laser; Mg;

    机译：复合材料;激光;镁;

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