目的：研究TiN/Ti涂层结构变化对TC4钛合金基体冲击塑性应变的影响。方法采用有限元分析软件ABAQUS建立球形Al2 O3颗粒冲击覆有TiN/Ti涂层TC4基体的二维轴对称模型，分析涂层硬质层厚度、硬质层层数对基体在冲击过程中的等效塑性应变的影响规律。结果对于无涂层的基体，其冲击塑性应变仅发生在冲击的加载阶段，冲击塑性应变分为加载及卸载两个阶段，加载阶段基体的塑性应变由球形颗粒的冲击产生，卸载阶段基体的塑性应变由涂层硬质层的回弹产生。对于单层结构涂层，当硬质层厚度低于12μm时，随着硬质层厚度的增加，基体的塑性应变较大且呈振荡变化；当硬质层厚度超过12μm时，随着硬质层厚度的增加，基体的塑性应变减小。对于多层结构涂层，当硬质层的厚度不变，增加涂层硬质层层数使得基体的塑性应变减小。结论有限元可以模拟分析TiN/Ti涂层结构对TC4钛合金冲蚀性能影响规律，优化TiN/Ti抗冲蚀涂层的结构设计参数，对抗冲蚀涂层的结构设计及其进一步研究具有指导意义。
ABSTRACT:Objective To study the effect of TiN/Ti coating structure on equivalent plastic strain of TC4 titanium alloy after im-pact. Methods By using the finite analysis software ABAQUS, a 2D axisymmetric finite element model was established for the im-pact between spherical particle and TC4 substrate coated by TiN/Ti costing. The effects of hard layer thickness and hard layer num-ber on the equivalent plastic strain of substrate were analyzed. Results Plastic strain of uncoated substrate occurred only during the loading stage of impact. Coating divided the plastic strain response of substrate into two parts, loading and unloading. For the sin-gle layer coating, when the thickness of the hard layer was less than 12 μm, the increased hard layer thickness oscillated the plas-tic deformation of substrate. When the thickness of the hard layer exceeded 12 μm, the increased hard layer thickness reduced the plastic deformation of substrate. For the multi-layer coating, when the thickness of hard layers was remained, the increased num-ber of layers can reduce the plastic deformation of substrates. Conclusion In conclusion, finite element simulation can be used to investigate the erosion behavior of TC4 titanium alloy with TiN/Ti coating, optimize the architecture of TiN/Ti anti-erosion coa-ting, and has guiding significance of architecture design and further research on anti-erosion coatings.
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