The Effect of Creep on Morphology Change of Surface Groove on Fecralloy in TBCs during Thermal Oxidation Cycles

Abstract:

In this work, the effects of creep behaviors for constituent materials in thermal barrier coatings (TBCs) on the morphology change occurring near the surface groove are investigated upon twenty-four purely thermal cycles using the finite element method. The formation of thermally grown oxide (TGO) in lateral and thickness directions at high temperature are simulated by means of material property change based on in-house measured material properties such as yield strength and TGO final thickness. The result shows that under the purely thermal cycles the creep in constituent materials significantly enhances the morphology change near the grooves. It is also found that creep in only substrate predominates at high temperature while creep only in TGO plays a less important role in the morphology change due to its relatively slower creep behavior compared to Fecralloy substrate.

• Periodical: Advanced Materials Research (Volumes 79-82)
• Pages: 1157-1160
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.79-82.1157
• Online since: August 2009
• Authors: Xia Huang, Jun Ding, K.J. Kang
• Keywords: Creep, Morphology Change, Numerical Simulation, Thermal Barrier Coating (TBC)

References

[1] J. Schwarzer, D. Lohe and O. Vohringer: Mat. Sci. Eng. A Vol. 387-389 (2004), p.692.

[2] B.W. Veal and A. P. Paulikas: Appl. Phys. Lett. Vol. 90 (2007), p.12914.

[3] A. M. Karlsson and A. G Evans: Acta. Mater. Vol. 49 (2001), p.1793.

[4] A. M. Karlsson, C.G. Levi and A. G. Evans: Acta Mater. Vol. 50 (2002), p.1263.

[5] S.S. Lee, S.K. Sun and K.J. Kang: Oxid. Met. Vol. 63 (2005), p.73.

[6] K.J. Kang and C. Mercer: Mat. Sci. Eng. A Vol. 478 (2008), p.154.

[7] S.K. Sharma, G. D. Ko and K.J. Kang: J. Eur. Ceram. Soc. Vol. 29 (2009), p.355.

[8] A. M. Karlsson, J. W. Hutchinson, A. G. Evans: J. Mech. Phys. Solids. Vol. 50(2002). p.1565.