镁合金表面TaC/TaC-Mg/Mg梯度涂层的 残余热应力分析
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湖南省自然科学基金资助项目(2018JJ4067,2020JJ6079)


Analysis of Thermal Residual Stresses of TaC/TaC-Mg/Mg Gradient Coating on Magnesium Alloy
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    摘要:

    采用有限元方法分析了镁合金ZK60表面TaC/TaC-Mg/Mg梯度涂层的残余热应力分布特征,研究了梯度层的层数与厚度、沉积温度对残余热应力的影响。结果表明,与TaC单层和TaC/Mg双层涂层相比,TaC/TaC-Mg/Mg梯度涂层的残余热应力最大值(112 MPa)分别减小67.2%和66.1%。当梯度层TaC-Mg的层数由1增加到8时,梯度涂层的径向应力最大值增大3.3%;而轴向应力和剪切应力的最大值则呈现先减小后增大的变化趋势,其中层数为3时的残余应力最大值最小。随着梯度层的厚度由0.25 μm增加到1.50 μm,径向应力、轴向应力和剪切应力最大值分别降低16.6%、47.6%和32.4%;但是当厚度继续增加到2.0 μm时,残余应力最大值的增幅小于8%。黏结层Mg的厚度对残余应力的影响较小,但残余应力随沉积温度的升高呈线性增加。

    Abstract:

    The finite element method was used to analyze the distribution of residual thermal stress of the TaC/TaC-Mg/Mg gradient coating on magnesium alloy ZK60. The effects of the number and thickness of gradient layers and deposition temperature on the residual stress were investigated. The results showed that the maximum residual thermal stress (112 MPa) of the TaC/TaC-Mg/Mg gradient coating was reduced by 67.2% and 66.1% compared to the TaC monolayer and TaC/Mg bilayer coatings, respectively. When the number of TaC-Mg gradient layers increased from 1 to 8, the gradient coating’s maximum radial stress increased by 3.3%, while the maximum axial stress and shear stress showed the trend of increasing after decreasing, with the number of layers being 3, the maximum residual stress was the smallest. Expanding the gradient layer’s thickness from 0.25 μm to 1.5 μm, the maximum values of radial stress, axial stress, and shear stress decreased by 16.6%, 47.6%, 32.4%, respectively. However, when the thickness continued to increase to 2.0 μm, the increase in the maximum value of the residual thermal stress was less than 8%. The thickness of the adhesive layer Mg had a small effect on the residual stress, but the residual stress increased linearly with the increase of deposition temperature.

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张海波,丁泽良,单湘衡,丁一帆,汤迎红,李文元.镁合金表面TaC/TaC-Mg/Mg梯度涂层的 残余热应力分析[J].包装学报,2020,12(5):35-44.

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  • 收稿日期:2020-07-21
  • 在线发布日期: 2020-12-05
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