Finite Element Analysis of Residual Stresses on Y-TZP/ LZAS Glass-ceramic Gradient Coatings

doi:10.11901/1005.3093.2014.196

Chinese Journal of Materials Research

2014, Vol. 28

Issue (10): 787-793 DOI: 10.11901/1005.3093.2014.196

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Finite Element Analysis of Residual Stresses on Y-TZP/ LZAS Glass-ceramic Gradient Coatings

Wei GONG^1,^2,^**(

),Liming ZHOU¹,Enze WANG³

1. School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010
2. Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900
3. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010

Cite this article:

Wei GONG,Liming ZHOU,Enze WANG. Finite Element Analysis of Residual Stresses on Y-TZP/ LZAS Glass-ceramic Gradient Coatings. Chinese Journal of Materials Research, 2014, 28(10): 787-793.

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Abstract

Y-TZP/ LZAS glass-ceramic gradient coatings on Q235 steel substrate were designed. The effects of compositional exponent, the number of graded layers and coating thickness on the residual stress were analyzed by using finite element software. The results show that the optimal coating could be obtain corresponding to the following parameters: the compositional gradient exponent m＝1, the number of graded layers= 3-5 and the coating thickness=1.0-1.5 mm. The radial compressive stress distributes on the surface of gradient coatings. There is clear stress concentration in the coating/substrate interface. The compositional exponent, layer numbers and the coating thickness have important influence on the radial stress, axial stress and shear stress in the coating/substrate interface. Y-TZP/ LZAS glass-ceramic gradient coatings were fabricated on Q235 steel substrate by slurry method. The residual stress of gradient coatings was measured by X-ray diffraction approach and the measurement results verified the reliability of the above simulation.

Key words: surface and interface in the materials glass ceramic finite element analysis gradient coating residual thermal stress

Received: 08 April 2014

Fund: *Supported by Key Laboratory of Testing Technology for Manufacturing Process Co-established by the Sichuan Province and the Ministry No. 13ZXK04 and Sichuan Science and Technology Support Program No. 2012FZ0020.

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.196 OR https://www.cjmr.org/EN/Y2014/V28/I10/787

Fig.1 Schematic description of the geometry used in the finite element modeling

Table 1 Material properties of Q235, glass-ceramic and 3Y-TZP

Fig.2 Volume fraction of 3Y-TZP in gradient layers

Fig.3 Effect of compositional exponent on the residual stress, (a) radial stress at the interface, (b) shear stress at the interface, (c) axial stress at the interface, (d) radial stress on the coating surface

Fig.4 Effect of layer number n on the residual stress, (a) radial stress at the interface, (b) shear stress at the interface, (c) axial stress at the interface, (d) radial stress on the coating surface

Fig.5 Effect of coating thickness on the residual stress, (a) radial stress at the interface, (b) shear stress at the interface, (c) axial stress at the interface, (d) radial stress on the coating surface

Fig.6 Typical contour of stress distribution of the gradient coatings (a) radial stress; (b) shear stress; (c) axial stress

Fig.7 Comparison of the finite element results with experimental results

Fig.8 Optical image of Vickers indentation on the coating surface (a) LZAS glass ceraimc coating on Q235 steel substrate; (b) Y-TZP/ LZAS glass-ceramic gradient coatings on Q235 steel substrate (n＝5)

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