Nonlinear Finite Element Simulation of Stress Distribution in YSZ Active Diffusion Barrier Coating System under Thermal Shock

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Nonlinear Finite Element Simulation of Stress Distribution in YSZ Active Diffusion Barrier Coating System under Thermal Shock
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                        Hu ZhenHu Zhen
Xi`an university of architecture and technology,school of metallurgical engineering,Xi`an
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Li ZhengxianLi Zhengxian
Northwest Institute for non-ferrous Metal Research, institute of corrosion and protection
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Liu LintaoLiu Lintao
Xi`an university of architecture and technology,school of metallurgical engineering,Xi`an
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Li JiangtaoLi Jiangtao
Northeastern University,school of material science and engineering,Shenyang
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Affiliation:Xi`an university of architecture and technology,school of metallurgical engineering,Xi`an,Northwest Institute for non-ferrous Metal Research, institute of corrosion and protection,Xi`an university of architecture and technology,school of metallurgical engineering,Xi`an,Northeastern University,school of material science and engineering,Shenyang
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Abstract:

The stress distribution and its evolution，after repeated thermal shock, in NiCrAlY coatings/YSZ diffusion barrier /René N5 substrate were studied using the finite element method, as well as the effect of peak value on stress. The results showed that higher shear and tensile stresses existed in the outer edge and the alumina layer, where cracks were easier to initiate and propagate, after 75 times- thermal shock. With the increasing number of thermal shock, the stresses in YSZ active diffusion barrier coating system increased. Moreover, the peak stress increasement was observed in the alumina layer, and the optimum peak value (A) was 3 μm.

Key words:YSZ active diffusion barrier coating system;thermal shock;optimum design;finite element analysis

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[Hu Zhen, Li Zhengxian, Liu Lintao, Li Jiangtao. Nonlinear Finite Element Simulation of Stress Distribution in YSZ Active Diffusion Barrier Coating System under Thermal Shock[J]. Rare Metal Materials and Engineering,2016,45(11):2851~2856.]
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Received:October 27,2015
Revised:March 11,2016
Adopted:March 29,2016
Online: December 08,2016
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