Paper Title:
Environmental Effect of Hot Corrosion on Creep and Fatigue Failure of Thermal Barrier Coating Systems
  Abstract

In order to clarify the failure behavior of plasma sprayed thermal barrier coating (TBC) systems under the complicated modes of thermal-mechanical-chemical loadings, the stress rupture property evaluation and failure analysis were conducted for Y2O3-ZrO2 (YSZ) and CaO-SiO2-ZrO2 (C2S-CZ) TBC systems in air and two kinds of high-temperature corrosive environments. Static creep loading was found to bring about the typical creep failure for TBC systems even in the aggressive environment so called hot corrosion almost in similar manner to the case in air. On the contrary, it was revealed that the dynamic fatigue loading tends to cause a significant failure life reduction of TBC systems both in air and in corrosive environments. For YSZ TBC system, the penetration crack preexisting through the top-coat layer tends to provide a nucleation site for the fatigue crack even in air, and more significantly a short circuit path for the corrosive species in hot corrosive environment. For C2S-CZ system, on the contrary, the top-coat / bond-coat interface tends to provide easily the nucleation site for a main crack to propagate thereafter toward both the alloy interior and outer surface. Under lower stress level at 950°C, however, the oxide-induced crack closure together with crack tip blunting attributed mainly to the high reactivity of Ca compounds as a major constituent of the TC is effective to suppress substantially the crack propagation, so as to cause the prolonged failure life as compared to YSZ system even in aggressive gaseous environment.

  Info
Periodical
Materials Science Forum (Volumes 522-523)
Edited by
Shigeji Taniguchi, Toshio Maruyama, Masayuki Yoshiba, Nobuo Otsuka and Yuuzou Kawahara
Pages
353-360
DOI
10.4028/www.scientific.net/MSF.522-523.353
Citation
S. Takahashi, M. Yoshiba, W. Kakuta, S. Matsuoka, Y. Harada, "Environmental Effect of Hot Corrosion on Creep and Fatigue Failure of Thermal Barrier Coating Systems", Materials Science Forum, Vols. 522-523, pp. 353-360, 2006
Online since
August 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Byung Bok Choi, Dong Ho Bae
Abstract:Austenitic stainless steel is a useful material for various industrial facilities such as the nuclear and steam power plant and the heavy...
9
Authors: Young Pyo Kim, Cheol Man Kim, Woo Sik Kim, Kwang Seon Shin
Abstract:A clear understanding of fatigue properties for the pipeline steel and its weld is important to provide information for pipeline design...
303
Authors: Won Beom Kim, Jeom Kee Paik
Abstract:In this research, corrosion fatigue tests using 490MPa TMCP steel were performed in synthetic seawater condition to investigate the...
1043
Authors: Won Beom Kim, Jeom Kee Paik
Abstract:In this research, corrosion fatigue tests using tensile strength of 490MPa TMCP steel were performed in synthetic seawater condition to...
1145
Authors: Yan Zeng Wu, Qing Yuan Wang, Qiao Lin Ouyang
Chapter 7: Building Materials
Abstract:Using the ultrasonic fatigue test method, the influence of subjection to plasma nitriding surface modifications on the ultra-high cycle...
1731