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Understanding processing parameters affecting residual stress in selective laser melting of Inconel 718 through numerical modeling

机译：通过数值模型了解影响Inconel 718选择性激光熔化中影响残余应力的加工参数

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摘要

In this study, a thermal-elastic-plastic finite element model is proposed to investigate the effect of volume energy density on the temperature field, molten pool size, and residual stress distribution in the selective laser melting (SLM) process of Inconel 718 alloy. A temperature-dependent thermal-mechanical property of materials is considered, as well as the properties conversion between powder layer and solidified alloy. Within the scope of the study parameters, the simulated molten pool size increases with increasing volume energy density and exhibits linear growth relationship, which are validated by the experimental results and show a good agreement. In addition, five scanning strategies are adopted to study the effect of these scanning strategies on the residual stress distribution in this research. The results show that the residual stress distribution of SLM Inconel 718 specimen largely depends on the scanning strategy. Finally, to reveal the mechanism of residual stress formation, the restraint bar model is used to further analyze the formation mechanism of residual stress during the SLM process.
机译：在这项研究中，提出了一个热弹塑性有限元模型来研究Inconel 718合金选择性激光熔化（SLM）过程中体积能量密度对温度场，熔池尺寸和残余应力分布的影响。考虑了材料的温度相关热机械性能，以及粉末层与凝固合金之间的性能转换。在研究参数的范围内，模拟的熔池尺寸随着体积能量密度的增加而增加，并表现出线性增长关系，这被实验结果证实并显示出良好的一致性。此外，本研究采用五种扫描策略来研究这些扫描策略对残余应力分布的影响。结果表明，SLM Inconel 718试样的残余应力分布在很大程度上取决于扫描策略。最后，为了揭示残余应力的形成机理，使用约束棒模型进一步分析了SLM过程中残余应力的形成机理。

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  • 来源
    《Journal of Materials Research》 |2019年第8期|1395-1404|共10页
  • 作者

    Song Jia; Zhang Liang; Wu Wenheng; He Beibei; Ni Xiaoqing; Xu Jiongkai; Zhu Guoliang; Yang Qiyun; Wang Tao; Lu Lin;

  • 作者单位

    Shanghai Res Inst Mat, Shanghai Engn Res Ctr 3D Printing Mat, Shanghai 200437, Peoples R China;

    Shanghai Res Inst Mat, Shanghai Engn Res Ctr 3D Printing Mat, Shanghai 200437, Peoples R China;

    Shanghai Res Inst Mat, Shanghai Engn Res Ctr 3D Printing Mat, Shanghai 200437, Peoples R China;

    Shanghai Res Inst Mat, Shanghai Engn Res Ctr 3D Printing Mat, Shanghai 200437, Peoples R China;

    Shanghai Res Inst Mat, Shanghai Engn Res Ctr 3D Printing Mat, Shanghai 200437, Peoples R China;

    Shanghai Res Inst Mat, Shanghai Engn Res Ctr 3D Printing Mat, Shanghai 200437, Peoples R China;

    Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China;

    Shanghai Res Inst Mat, Shanghai Engn Res Ctr 3D Printing Mat, Shanghai 200437, Peoples R China;

    Shanghai Res Inst Mat, Shanghai Engn Res Ctr 3D Printing Mat, Shanghai 200437, Peoples R China;

    Shanghai Res Inst Mat, Shanghai Engn Res Ctr 3D Printing Mat, Shanghai 200437, 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

    finite element model; volume energy density; scanning strategy; residual stress; Inconel 718 alloy;

    机译：有限元模型体积能量密度扫描策略残余应力Inconel 718合金;

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