| 摘要: |
| 在冷喷涂过程中，基体的表面粗糙度会影响涂层和基体之间的结合，目前对该问题关注还不够，且存在一定争议。以冷喷涂修复 Ti6Al4V 钛合金(TC4)过程为研究对象，利用有限元模拟手段，建立二维和三维单粒子在不同表面粗糙度基体上的撞击模型。通过分析粒子在撞击到光滑表面、研磨表面和喷砂表面三种情况下界面的温度、等效塑性应变及系统能量的变化，得出以下结论：随着基体表面粗糙度的增加，粒子的等效塑性应变和扁平率逐渐减小。界面温度和等效塑性应变在基体“波峰”处较高，在“波谷”处较低，在高的表面粗糙度下，粒子的塑性变形减弱，反弹趋势增强。研究结果表明，对冷喷涂 TC4 修复过程而言，基体的粗糙化不利于涂层与基体的结合。研究结果可为冷喷涂修复钛合金过程中基体预处理方式的选择提供理论指导。 |
| 关键词: 冷喷涂 基体表面粗糙度 TC4 数值模拟 界面结合 |
| DOI：10.11933/j.issn.1007-9289.20211112001 |
| 分类号:TG148 |
| 基金项目:国家自然科学基金资助项目(52001180) |
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| Numerical Simulation of Substrate Roughness on the Interface Bonding of Cold-sprayed Ti6Al4V |
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JIANG Shengwei1, ZHOU Hongxia1, LI Xueting1, WANG You2
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1.School of Mechanical Engineering, Qinghai University, Xining 810016 , China;2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 , China
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| Abstract: |
| In the process of cold spraying, the roughness of the substrate affects interface bonding between the coating and the substrate. At present, little attention is paid to this issue, and there still exists certain disputes. Took the process of cold spray repairing Ti6Al4V titanium alloy (TC4 for short) as the research object, by using finite element simulation method, two-dimensional and three-dimensional single particle impact models with different roughness are established, and the changes in interface temperature, particle equivalent plastic strain and system energy when the particle impacted on smooth, ground and grit blasted surfaces are analyzed. The following conclusions are drawn: As the substrate roughness increases, the equivalent plastic strain and flattening ratio of the particle gradually decreases; The interface temperature and equivalent plastic strain are higher at the “wave peak” and lower at the “trough” of the substrate. Under high roughness, the plastic deformation of the particles is weakened while the rebound tendency of the particles is enhanced. Therefore, for the cold-sprayed TC4 repair processing, the roughening of the substrate is not conducive to the bonding of the coating and the substrate. The results provide theoretical guidance for substrate pretreatment in the process of repairing titanium alloy by cold spraying. |
| Key words: cold spraying substrate roughness TC4 numerical simulation interface bonding |
