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| INVESTIGATION OF STRUCTURAL INTEGRITY AND LIFE TIME PREDICTION OF THE THERMAL SPRAYED ALLOY COATING FOR REMANUFACTURING |
| XU Binshi, WANG Haidou, PIAO Zhongyu, ZHANG Xiancheng |
| National Key Laboratory for Remanufacturing, Academy of Armored Forces Engineering, Bejing 100072 |
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Cite this article:
XU Binshi WANG Haidou PIAO Zhongyu ZHANG Xiancheng. INVESTIGATION OF STRUCTURAL INTEGRITY AND LIFE TIME PREDICTION OF THE THERMAL SPRAYED ALLOY COATING FOR REMANUFACTURING. Acta Metall Sin, 2011, 47(11): 1355-1361.
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Abstract Thermal spray technique is one of the key techniques in remanufacture engineering. The thermal sprayed coatings are commonly used in remanufacturing applications, their initial performance and service lifetime are critical to the success of remanufacturing. In the present paper, structural integrity, lifetime and failure mechanism of plasma sprayed coatings were investigated. The influences of hydrogen gas flow, spraying powder and powder feed rate on porosity in coatings and their mechanical properties were described. The rolling contact fatigue (RCF) experiment was conducted to develop a method of life time prediction and to reveal the failure mechanism for plasma sprayed coatings. The results show that the structural integrity of coatings can be obviously influenced by spraying process and an optimal design of spraying process can remarkably promote the coating performance. For this purpose, the S-N curve was established based on the large sample space to be used to easily predict coating lifetime. It is found that corrosive pitting, spalling and hierarchical failure are the main failure modes, those results from asperity contact, subsurface defect propagation and shear stress distribution, respectively.
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Received: 24 May 2011
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| Fund: Supported by National Basic Research Program of China (Nos.2011CB013405 and 2011CB013403) and National Natural Science Foundation of China
(Nos.50735006 and 50975285) |
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