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首页> 外文期刊>Materials Science Research International >High Temperature Fatigue Deformation Measurement of Ceramics Thermally Sprayed SUS304 Steel Using an ESPI System
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High Temperature Fatigue Deformation Measurement of Ceramics Thermally Sprayed SUS304 Steel Using an ESPI System

机译：使用ESPI系统测量陶瓷热喷涂SUS304钢的高温疲劳变形

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摘要

Surface strains of Al_2O_3/NiCr thermally sprayed SUS304 steel specimens during the fatigue test (σ_(max)=173MPa, R=0, T=813K) were measured using an electronic speckle pattern interferometry (ESPI) system. The relationships between surface strain and crack initiation / delamination behavior are discussed. The strain values obtained from the ESPI system were confirmed to be almost the same as those from strain gauges on un-sprayed specimens when tensile stresses were loaded at 293K. Thermal expansion deformation and stress deformation at high temperatures were easily measured with the ESPI system. The presence of cracks and delamination on the sprayed coatings can be nondestructively detected by analyzing the strain concentration or decrease. The surface strains of sprayed specimens were almost the same as those of un-sprayed specimens at 873K, indicating that the deformation of the sprayed coatings are always associated with that of the substrate surfaces at high temperature. The maximum surface strain after 1 x 10~5 cycles test was a little lower than after 2 cycles test. Surface cracks occurred but stopped at the inner NiCr layer after 2 cycles test at 873K. Many surface cracks and delamination along the interface between the NiCr layer and substrate interface were confirmed after 1 x 10~5 cycles test.
机译：使用电子散斑图干涉仪（ESPI）系统测量了疲劳测试期间Al_2O_3 / NiCr热喷涂SUS304钢试样的表面应变（σ_（max）= 173MPa，R = 0，T = 813K）。讨论了表面应变与裂纹萌生/分层行为之间的关系。当在293K上施加拉应力时，从ESPI系统获得的应变值被证实与未喷涂样品上的应变仪几乎相同。使用ESPI系统可轻松测量高温下的热膨胀变形和应力变形。通过分析应变浓度或降低可以无损检测喷涂层上是否存在裂纹和分层。喷涂样品的表面应变与873K时未喷涂样品的表面应变几乎相同，这表明在高温下，喷涂涂层的变形始终与基材表面的变形有关。 1 x 10〜5个循环测试后的最大表面应变略低于2个循环测试后的最大表面应变。在873K的2个循环测试后，出现了表面裂纹，但在内部NiCr层处停止了。经过1 x 10〜5次循环测试，证实了沿NiCr层与基材界面之间的界面出现了许多表面裂纹和分层。

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