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Computational and experimental study on laser heating of a Ni-based metal alloy

机译：镍基金属合金激光加热的计算与实验研究

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摘要

Both computational and experimental studies were conducted to characterize complex heat transport and damage evolution phenomena in a metal alloy material subjected to laser irradiation. A Ni-based alloy, Inconel 718, was subjected to various irradiances of a flat-top, 4 cm diameter beam of continuous wave, 1.07 μm wavelength light. In this numerical study, a nonlinear transient finite element (FE) analysis, based on conductive, convective and radiative heat transfer, was conducted to predict temperature evolution (i.e., during heating, melting, and cooling conditions), damage initiation, and damage progression. A two-dimensional axisymmetric model was built with experimentally relevant plate geometry. ANSYS, a commercial FE software package, was used to conduct the nonlinear transient analyses. Such analyses employ an element removal feature to predict realistic evolution of the melt front within the laser heated Inconel 718 plates. The element removal scheme ensured that the laser energy supplied to removed elements no longer contributed to heating the rest of the intact material portion, and that the melt elements would not reappear (e.g., during cooling stage). Spanning a wide range of laser irradi-ance levels (i.e., from 11 W/cm~2 to 828 W/cm~2), the numerical model demonstrated good agreement with the experimentally measured temperatures during heating and cooling. After confirming the validity of measured temperature progression, the numerical model provided predictions in good agreement with experimentally measured penetration times and final damage (hole) sizes.
机译：进行了计算和实验研究，以表征经受激光辐照的金属合金材料中的复杂传热和损伤演化现象。对Ni基合金Inconel 718进行了各种辐照，这些辐照是直径为4 cm的平顶连续波1.07μm波长的光束。在此数值研究中，进行了基于传导，对流和辐射热传递的非线性瞬态有限元（FE）分析，以预测温度变化（例如，在加热，熔化和冷却条件下），损伤发生和损伤进展。建立了具有实验相关板几何形状的二维轴对称模型。商业有限元软件包ANSYS被用于进行非线性瞬态分析。此类分析采用元素去除功能来预测激光加热的Inconel 718板中熔体前沿的实际演变。元素去除方案确保了提供给去除的元素的激光能量不再有助于加热其余完整材料部分，并且确保熔化的元素不会再次出现（例如，在冷却阶段）。该数值模型涵盖了很宽的激光辐照度水平（即从11 W / cm〜2到828 W / cm〜2），与加热和冷却期间的实验测量温度具有很好的一致性。在确认测得的温度变化的有效性之后，数值模型提供的预测值与实验测得的穿透时间和最终损伤（孔）的尺寸非常吻合。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2016年第11期|1034-1043|共10页
  • 作者

    Sangwook Sihn; Lawrence B. Childers; Craig T. Walters; Mark S. Forte; Ajit K. Roy; Jonathan P. Vernon;

  • 作者单位

    Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RX, Wright-Patterson Air Force Base, OH, USA,University of Dayton Research Institute, Nonstructural Materials Division, Dayton, OH, USA;

    Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RX, Wright-Patterson Air Force Base, OH, USA,Azimuth Corporation, Dayton, OH, USA;

    Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RX, Wright-Patterson Air Force Base, OH, USA,Craig Walters Associates, Powell, OH, USA;

    Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RX, Wright-Patterson Air Force Base, OH, USA;

    Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RX, Wright-Patterson Air Force Base, OH, USA;

    Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/RX, Wright-Patterson Air Force Base, OH, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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