| 田贺,何利民,牟仁德.热障涂层对DD6单晶高温合金高周疲劳性能的影响[J].装备环境工程,2019,16(1):41-46. TIAN He,HE Li-min,MU Ren-de.Effect of Thermal Barrier Coatings on High Cycle Fatigue Properties of DD6 Single Crystal Superalloy[J].Equipment Environmental Engineering,2019,16(1):41-46. |
| 热障涂层对DD6单晶高温合金高周疲劳性能的影响 |
| Effect of Thermal Barrier Coatings on High Cycle Fatigue Properties of DD6 Single Crystal Superalloy |
| 投稿时间：2018-10-31 修订日期：2019-01-25 |
| DOI：10.7643/ issn.1672-9242.2019.01.008 |
| 中文关键词: DD6二代单晶高温合金 电子束物理气相沉积 热障涂层 高周疲劳性能 断裂模式 |
| 英文关键词:DD6 second generation single crystal superalloy electron beam physical vapor deposition thermal barrier coatings high cycle fatigue property fracture mode |
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| 目的 研究电子束物理气相沉积热障涂层对单晶高温合金高周疲劳性能的影响，为热障涂层在涡轮叶片上的应用提供技术支持。方法 采用真空电弧镀和电子束物理气相沉积工艺制备YSZ热障涂层，进行900 ℃条件下高周疲劳性能测试，采用扫描电镜对测试后的试样表面、断口形貌进行观察与分析。结果 在900 ℃、380 MPa条件下，带涂层的DD6单晶试棒循环次数（Nf）超过了107，420 MPa条件下超过了106。通过对DD6单晶试棒断口分析，失效后的带涂层试棒仍以DD6单晶常见滑移解离形式发生破坏。结论 高周疲劳性能测试条件下，带YSZ热障涂层的试棒中粘结层率先产生垂直微裂纹，但是裂纹扩展延伸中发生氧化钝化，之后DD6基体沿正常的滑移方向从表面向内部疲劳扩展，带涂层的试棒疲劳裂纹并非由涂层微裂纹直接扩展形成，热障涂层对DD6单晶高温合金高周疲劳性能影响较小。 |
| 英文摘要: |
| Objective To study on the effect of electron beam physical vapor deposition (EB-PVD) thermal barrier coatings (TBCs) on the high cycle fatigue properties of single crystal superalloy and provide a technical basis for application of thermal barrier coatings on turbine blades. Methods YSZ thermal barrier coatings were prepared by vacuum arc plating and EB-PVD and high cycle fatigue tests for the coatings samples were carried out at 900 ℃. The surface and fracture morphologies of the tested samples were observed and analyzed with scanning electron microscope (SEM). Results Under the condition of 900 ℃ and 380 MPa, the fatigue cycles of DD6 single crystal alloy with TBCs were more than 107 times without breaking. On the other hand, the fatigue cycles of DD6 superalloy exceeded 106 times when the load was 420 MPa. By analyses of the fracture morphologies of DD6 single crystal alloy, the coated samples were still destroyed by the common slip and dissociation of DD6 single crystal alloy. Conclusion Although the vertical cracks first appeared in the bond coating of the coated samples in high cycle fatigue property, the phenomenon of oxidative passivation occurs during the propagation of the cracks. After that, the cracks in the DD6 matrix extends from the surface to the interior along the normal slip direction. The fatigue cracks of the coated samples are not directly formed by micro cracks in the coatings, so thermal barrier coatings have little effect on the high cycle fatigue properties of single crystal superalloy. |
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