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首页> 外文期刊>Journal of Materials Science >Using ESPI system to measure high temperature fatigue deformation of ceramics thermally sprayed SUS304 steel
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Using ESPI system to measure high temperature fatigue deformation of ceramics thermally sprayed SUS304 steel

机译：使用ESPI系统测量SUS304热喷涂陶瓷的高温疲劳变形

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The strains in an Al2O3/NiCr coating, which was thermally sprayed on SUS304 steel, were analyzed using an electronic speckle pattern interferometry (ESPI) system during fatigue testing (R = 0, sigma(max) = 173 MPa) at high temperature of 873 K. The strain changes with the crack initiation in the coatings and the delamination at the coating/substrate interface are accordingly discussed. Surface cracks originated from the top coating of Al2O3 and stopped at the bond coating of NiCr after 2 cycles test at 873 K. Many surface cracks and delamination along the NiCr/substrate interface were confirmed after 1 x 10(5) cycles test. The strain values of un-sprayed specimens obtained from the ESPI system agreed with those measured by the strain gauge when tensile stresses were applied at room temperature. The deformation by thermal expansion and stress application at high temperatures can also be easily measured using this method. The strain on sprayed specimens was almost the same with that on un-sprayed specimens at 873 K, indicating the deformation in the coatings are always associated with that of the substrate surfaces at high temperature. By comparing and analyzing the strain distribution on the coating surface, the presence of cracks in the coatings and delamination at the coating/substrate interface can be in-situ and nondestructively detected. (C) 2004 Kluwer Academic Publishers. [References: 21]
机译：在疲劳测试（R = 0，sigma（max）= 173 MPa）的高温873温度下，使用电子散斑干涉仪（ESPI）系统分析了喷涂在SUS304钢上的Al2O3 / NiCr涂层中的应变。 K.相应地讨论了随着涂层中的裂纹萌生和涂层/基体界面处的分层而引起的应变变化。表面裂纹起源于Al2O3的顶部涂层，并在873 K下进行了2个循环测试后停止在NiCr的粘结涂层上。经过1 x 10（5）个循环测试后，确认了许多表面裂纹和沿NiCr /基板界面的分层。当在室温下施加拉应力时，从ESPI系统获得的未喷涂样品的应变值与应变仪测得的应变值一致。使用这种方法，也可以很容易地测量高温下的热膨胀和应力施加引起的变形。喷涂样品上的应变与873 K下未喷涂样品上的应变几乎相同，这表明在高温下，涂层的变形始终与基材表面的变形有关。通过比较和分析涂层表面上的应变分布，可以原位且无损地检测涂层中裂纹的存在和涂层/基材界面处的分层。 （C）2004 Kluwer学术出版社。 [参考：21]

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