METALS AND METAL MATRIX COMPOSITES |
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Influence of Substrate Hardness and Thermal Characteristics on Microstructure and Mechanical Properties of Cold Sprayed TC4 Titanium Alloy Coatings |
CAO Congcong1, LI Wenya1, YANG Kang1, LI Chengxin2, JI Gang2
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1 State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi’an 710072 2 School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049 |
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Abstract Titanium honeycomb components which suffered damage during service are usually in urgent need of timely repair. The currently prevailing repair method is melt welding, which often causes serious metallurgical defects. The relatively low operating temperature of cold spray is considered to be able to prevent the oxidation of metal particles in comparison. In our work, TC4 titanium alloy coatings were deposited by cold spray on surfaces of AA2024 aluminum alloy and TC4 titanium alloy substrates, respectively. And subsequently SEM, XRD, Vickers hardness test and three point bending test were carried out for the resultant coatings, in order to evaluate the influence of substrates’ hardness and thermal characteristics on coatings’ microstructures and mechanical properties. Results showed that, compared with AA2024 substrate, TC4 substrate, which owns higher hardness, lower heat capacity and lower thermal conductivity, has a less fluctuating interface with the sprayed TC4 coating, a higher particle surface temperature, and promotes the metallurgical bonding owing to the formation of a ~ 5 μm layer of adiabatic shear band among particles’ contact interfaces. This contributes to the lower porosity and more satisfactory deposition effect, and in consequence, higher micro-hardness, better bending property, smooth fractured surface characterized by brittle fracture with no phase change happened. Our research confirmed the feasibility of repairing titanium alloy components by applying cold spray technique.
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Published: 31 January 2019
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Fund:This work was financially supported by the National Key Research and Development Program of China (2016YFB0701203, 2016YFB1100104) and the Shanghai Aerospace Science and Technology Foundation (SAST2016043). |
About author:: Wenya Li is the principal professor and the director of Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University (NPU). He received his B.S. degree in Materials Forming and Control Engineering in 1998, his M.S. degree in Materials Processing Engineering in 2001 and his Ph.D. in Materials Science and Engineering in 2005, all from Xi’an Jiaotong University of China. He did research on cold spraying at a postdoctoral level at the University of Technology of Belfort-Montebiard of France from 2005 to 2007. In 2007, he joined the faculty of NPU of China as an Associate Professor. He got the ex-ceptional promotion to become a full professor in Materials Science and Engineering in 2011. His research is focused on the CS process optimization and equipment development, microstructural and mechanical characterizations of CSed coatings, as well as on the numerical modeling of the whole process. He has acquired plenty of experience on CS and got published 101 peer-reviewed papers on CS, mainly including Intel Mater Rev, Acta Mater, Corros Sci, J Alloy Compnd, Mater Design, Surf Coat Technol and J Mater SCI Technol, etc, with a total citation of about 1800 and H-index of 34, and 13 national invention patents have been authorized. In 2008, he received the 2nd class State Natural Science Award together with four other scientists as the forth participant. In 2017, he got the 2nd class Shaanxi Province Science and Technology Award as the first participant. |
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