Influence of Substrate Hardness and Thermal Characteristics on Microstructure and Mechanical Properties of Cold Sprayed TC4 Titanium Alloy Coatings

被引：0
|
作者：
Cao C. [1 ]
Li W. [1 ]
Yang K. [1 ]
Li C. [2 ]
Ji G. [2 ]
机构：
[1] State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, Xi'an
[2] School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an
来源：
Cailiao Daobao/Materials Review | 2019年 / 33卷 / 01期
关键词：
Cold spray; Deposition characteristic; Hardness; Mechanical property; Microstructure; Porosity; Specific heat capacity; Substrate; TC4 titanium alloy coating; Thermal conductivity;
D O I：
10.11896/cldb.201902014
中图分类号：
学科分类号：
摘要：
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. © 2019,Materials Review Magazine. All right reserved.
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页码：277 / 282
页数：5
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