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| 超音速激光沉积Ti6Al4V涂层的微观结构及耐蚀性能 |
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李波1,2, 吴丽娟1,2, 张欣1,2, 马春飞1,2, 张群莉1,2, 姚建华1,2
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1.浙江工业大学 激光先进制造研究院, 杭州 310014;2.浙江省高端激光制造装备协同创新中心, 杭州 310014
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| 摘要: |
| 超音速激光沉积技术是将激光加热与冷喷涂同步耦合的一种新型材料沉积技术。文中利用超音速激光沉积技术在中碳钢基体上制备Ti6Al4V涂层，并采用SEM、XRD、电化学腐蚀测试等手段对涂层厚度、显微组织、相成分以及耐蚀性能进行了表征分析。结果表明，在一定的激光辐照温度（即沉积区温度）范围内，涂层沉积效率、致密性以及涂层与基体之间的结合强度均随激光辐照温度的升高而增加，当激光辐照温度为800℃时，沉积效率是冷喷涂的4倍，涂层中的孔隙率仅为4.38%，涂层与基体的结合强度达75 MPa。由于低热输入的原因，涂层的物相组成与原始钛合金粉末基本一致。随着激光辐照温度的进一步提高，涂层中有TiN相的产生，不利于粉末的沉积，涂层的沉积效率、致密性以及结合强度均下降，但是在酸性腐蚀介质中，TiN的存在提高了涂层的耐蚀性能。 |
| 关键词: 超音速激光沉积 钛合金 显微组织 相组成 耐蚀性能 |
| DOI：10.11933/j.issn.1007-9289.20180412001 |
| 分类号:TG174.44 |
| 基金项目:国家重点研发计划（2017YFB1103601）；NSFC-浙江省两化融合联合基金（U1509201）；国家自然科学基金（51701182） |
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| Microstructure and Corrosion-resistant Property of Ti6Al4V Coating Prepared by Supersonic Laser Deposition |
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LI Bo1,2, WU Lijuan1,2, ZHANG Xin1,2, MA Chunfei1,2, ZHANG Qunli1,2, YAO Jianhua1,2
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1.Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou 310014, China;2.Collaborative Innovation Center of High-end Laser Manufacturing Equipment, Hangzhou 310014, China
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| Abstract: |
| Supersonic laser deposition (SLD) is a newly developed material deposition technique that synchronously combines the laser heating with cold spray (CS). The deposition of Ti6Al4V powder onto medium carbon steel substrate by SLD was studied. The thickness, microstructure, phase composition and corrosion-resistant property of the deposited coating were examined by SEM, XRD and electrochemical test. Results show that the deposition efficiency, coating density and bonding strength between the coating and the substrate increase by evaluating the laser irradiation temperature within certain range. As the laser irradiation temperature reaches 800℃, the deposition efficiency is 4 times as that of the CS coating. The coating porosity is as low as 4.38%, and the bonding strength between coating and substrate increases to 75 MPa. Due to relatively low heat input during SLD process, the phase composition of the deposit is similar to that of the pristine powder. Further increasing the laser irradiation temperature results in the presence of TiN in the deposit, which prevents the effective deposition of Ti6Al4V powder. However, the existence of TiN in the deposit can improve its corrosion-resistant property in acid solution. |
| Key words: supersonic laser deposition titanium alloy microstructure phase composition corrosion-resistant property |