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送粉式激光增材制造TC4钛合金熔覆层组织及电化学腐蚀行为的研究

Microstructure and Electrochemical Corrosion Behavior of TC4 Titanium Alloy Cladding Layer Prepared with Powder Feeding Laser Additive Manufacturing

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摘要

采用激光增材制造(LDM)技术在TC4钛合金基体表面制备了TC4钛合金熔覆层, 研究了不同扫描速率下制备的熔覆层的组织、显微硬度以及其在H2SO4溶液中的抗电化学腐蚀性能。结果表明:熔覆层的主要物相为α-Ti, 且在β晶界附近生成了细针状α′马氏体, 组织呈正交状网篮结构; 随着扫描速率增大, 熔覆层的平均显微硬度先增大后减小, 腐蚀电流密度先降低后升高, 电荷转移电阻先增大后减小, 即其耐蚀性先增强后减弱; 当扫描速率为10 mm/s时, 熔覆层具有最大的平均显微硬度(390 HV)、最小的腐蚀电流密度(1.2337 μA·cm-2)、最大的电荷转移电阻(11500 Ω·cm-2), 此时的熔覆层具有较好的抗电化学腐蚀性能。

Abstract

TC4 alloy cladding layer is prepared on TC4 titanium alloy substrate with laser additive manufacturing (LDM) technology, and the microstructure, microhardness and electrochemical corrosion resistance of the cladding layers in sulfuric acid solution are studied. The results show that the main phase of the cladding layers is α-Ti, and the fine acicular α′ martensite is formed near the β grain boundary, showing orthogonal basket-weave microstructure. With the increase of the scanning speed, the average microhardness of the cladding layers increases first and then decreases, the corrosion current density decreases first and then increases, and the charge transfer resistance increases first and then decreases, that is, its corrosion resistance also strengthens first and then weakens. In contrast, when the scanning speed is 10 mm/s, the cladding layer has the highest average microhardness (390 HV), minimum corrosion current density (1.2337 μA·cm-2), and maximum charge transfer resistance (11500 Ω·cm-2), and at this time, the cladding layer has better resistance to electrochemical corrosion.

Newport宣传-MKS新实验室计划
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中图分类号:TG179

DOI:10.3788/cjl201946.0302003

所属栏目:激光制造

基金项目:国家自然科学基金(61475117, 51471084)、国家重点研发计划(2016YFB1100501, 2017YFB1103604)、天津市青年拔尖人才项目(TJTZJH-QNBJRC-2-15)

收稿日期:2018-10-09

修改稿日期:2018-11-03

网络出版日期:2018-11-23

作者单位    点击查看

冯晓甜:天津工业大学激光技术研究所, 天津 300387
顾宏:天津工业大学激光技术研究所, 天津 300387
周圣丰:天津工业大学激光技术研究所, 天津 300387
雷剑波:天津工业大学激光技术研究所, 天津 300387

联系人作者:雷剑波(ljbtj@163.com)

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引用该论文

Feng Xiaotian,Gu Hong,Zhou Shengfeng,Lei Jianbo. Microstructure and Electrochemical Corrosion Behavior of TC4 Titanium Alloy Cladding Layer Prepared with Powder Feeding Laser Additive Manufacturing[J]. Chinese Journal of Lasers, 2019, 46(3): 0302003

冯晓甜,顾宏,周圣丰,雷剑波. 送粉式激光增材制造TC4钛合金熔覆层组织及电化学腐蚀行为的研究[J]. 中国激光, 2019, 46(3): 0302003

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