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Thermally Grown Oxide의 고온 크리프에 따른 열차폐 코팅의 잔류응력 분포에 관한 유한요소해석
장중철,최성철,Jang, Jung-Chel,Choi, Sung-Churl 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.8
The residual stress changes on thermo-mechanical loading in the interface region of the Thermal Barrier Coating (TBC)/Thermally Grown Oxide (TGO)/Bond Coat (BC) were calculated on the TBC-coated superalloys using a Finite Element Method (FEM). It was found that the residual stress of the interface boundary was dependent upon mainly the oxide formation and the swelling rate of the oxide by creep relaxation. During an oxide swelling, the relaxation of residual stress which is due to creep deformation increased the TBC's life. In the case of the fine grain size of TGO scale, the TBC stresses piled up by oxide swelling could be relaxed by diffusional creep effect of TGO.
열차폐 코팅의 TGO 성장과 형상비에 따른 TC-BC-TGO 계면에서의 잔류응력 변화에 대한 유한요소해석
장중철,최성철,Jang, Jung-Chel,Choi, Sung-Churl 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.7
The residual stresses in the interface region of the Thermal Barrier Coating (TBC)/Thermally Grown Oxide (TGO)/Bond Coat (BC) were calculated on the TBC-coated superalloy samples using a Finite Element Method (FEM). It was found that the stress distribution of the interface boundary was dependent upon mainly the geometrical shape or its aspect ratio and the thickness of TGO layer, which was formed by growth and swelling behavior of oxide layer. Maximum compressive residual stress in the TBC/TGO interface is higher than that of the TGO/bond coat interface, and the tensile stress had nothing to do with change of an aspect ratio. The compressive residual stresses in the TBC/TGO and TGO/bond coat interface region increased gradually with the TGO growth.
2.25Cr강 보일러 튜브재료의 고온입계균열 발생 거동
유근봉(Keun Bong Yoo),허남회(Nam Hoe Heo),장중철(Jung Chel Jang),김재훈(Jae Hoon Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Recently, a premature failure of boiler tubes or pipes has frequently occurred at several domestic power plants and most of the fracture type was intergranular. It has been well known that the elevated temperature intergranular cracking in heat-resistant steels occurs through the combination of closely spaced voids at the grain boundaries oriented normal to the tensile stress. However, what the mechanism of low ductility intergranular fracture induced by the tensile stress is are still obscure. In this study, we analyzed the behavior of the elevated temperature intergranular cracking in 2.25Cr-1.5W heat-resistant steels through stress-rupture test. We used the SEM(Scanning Electron Microscope) and AES(Auger Electron Spectroscopy) to investigate the fracture surface and segregation behavior.