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Cross-Sectional Residual Stresses in Thermal Spray Coatings Measured by Moiré Interferometry and Nanoindentation Technique

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Abstract

A plasma-sprayed thermal barrier coating (TBC) was deposited on a stainless steel substrate. The residual stresses were firstly measured by moiré interferometry combined with a cutting relaxation method. The fringe patterns in the cross-section of the specimen clearly demonstrate the deformation caused by the residual stress in thermal spray coatings. However, restricted by the sensitivity of moiré interferometry, there are few fringes in the top coat, and large errors may exist in evaluating the residual stress in the top coat. Then, the nanoindentation technique was used to estimate the residual stresses across the coating thickness. The stress/depth profile shows that the process-induced stresses after thermal spray are compressive in the top coat and a tendency to a more compressive state toward the interface. In addition, the stress gradient in the substrate is nonlinear, and tensile and compressive stresses appear simultaneously for self-equilibrium in the cross-section.

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Acknowledgments

The authors are grateful to the financial supported by the National Basic Research Program of China (“973” Project) (Grant No. 2010CB631005, 2011CB606105), the National Natural Science Foundation of China (Grant Nos. 11172151, 90916010), Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20090002110048). The authors are grateful to the opening funds from the State Key Laboratory of Explosion Science and Technology (KFJJ10-18Y).

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Authors and Affiliations

  1. AML, Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China

    Jianguo Zhu, Huimin Xie & Zhenxing Hu

  2. Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, 212013, Jiangsu, China

    Jianguo Zhu

  3. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China

    Pengwan Chen & Qingming Zhang

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  1. Jianguo Zhu
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Correspondence to Jianguo Zhu.

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Zhu, J., Xie, H., Hu, Z. et al. Cross-Sectional Residual Stresses in Thermal Spray Coatings Measured by Moiré Interferometry and Nanoindentation Technique. J Therm Spray Tech 21, 810–817 (2012). https://doi.org/10.1007/s11666-012-9732-7

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  • DOI: https://doi.org/10.1007/s11666-012-9732-7

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