ZrTiAlN涂层的残余应力分析

Analysis of Residual Stress in ZrTiAlN Coating

采用有限元法分析Q235 A基ZrTiAlN涂层的残余应力,研究涂层厚度、过渡层对残余应力的影响。结果表明:层-基界面边缘处存在明显应力集中现象;涂层内的切向应力和轴向应力主要表现为拉应力,径向应力则表现为压应力。涂层厚度的变化对层-基界面应力的性质与分布影响很小;但随着涂层厚度的增加,界面处的切向应力增大,径向应力和轴向应力减小。加入过渡层后,涂层内残余应力明显减小,其中含有TiAl/Zr过渡层的涂层的切向应力、轴向应力和径向应力的最大值分别降低33%,25%和14%。

The residual stress in ZrTiAIN coating on Q235 A substrate was analyzed by finite element method. Effects of coating thickness and interlayer on residual stress were investigated. The results showed that the critical stress concentration occurred at the boundary of the interface between ZrTiAlN coating and Q235 A substrate. The tangential stress and axial stress in ZrTiAlN coating were mainly tensile stress and the radial stress was mainly compressive stress. The change of the coating thickness had little impact on the nature and distribution of interface stress. With the increasing of coating thickness, the tangential stress at the interface increased, while the radial stress and the axial stress decreased. The residual stresses in the coating with interlayer were obviously decreased. The maximum value of the tangential stress, axial stress and radial stress of the coating with TiAl/Zr interlayer were decreased by 33%, 25% and 14%, respectively.