<span>电子束3D打印Ti-6Al-4V合金电化学腐蚀性能研究<br /></span> <br />-中国材料进展

文章信息/Info

Title:: Electrochemical Corrosion Properties of Electron Beam 3D Printing Ti-6Al-4V Alloy

作者:: 余志君1; 陈卓2; 祁广源3; 曲寿江1; (1.同济大学材料科学与工程学院，上海 201804)
(2.航天海鹰(哈尔滨)钛业有限公司黑龙江哈尔滨 150028)
(3.大连供电公司，辽宁大连116000)

Author(s):: YU Zhijun1; CHEN Zhuo2; QI Guangyuan3; QU Shoujiang1; (1. School of Materials Science and Engineering, Tongji University, Shanghai 201804, China)
(2. Aerospace Hiwing (Harbin) Titanium Industrial Co., Ltd., Harbin 150028, China)
(3. Dalian Power Supply Company, Dalian 116000，China)

Keywords:: Ti-6Al-4V alloy; 3D printing; microstructure; electrochemical corrosion

摘要:: 研究了电子束3D打印Ti6Al4V合金的微观组织和电化学腐蚀性能之间的关系。研究表明，在平行于成型方向(XOZ面)，观察到竖直生长的原始β柱状晶，其主要由晶界柱状α、沿晶界生长的集束α以及β晶内网篮状α组成，其中，网篮组织内部α片层取向各异，细小的棒状β相位于α片层之间。通过在1 mol/L HCl溶液中对合金动态极化曲线和电化学阻抗谱的测量来研究各成型面抗腐蚀性能，与XOY面相比，XOZ面表现出更好的耐腐蚀性，这种性能的差异与合金显微组织密切相关，利用OM、SEM和TEM等分析手段可得，各个成型面抗腐蚀性能差异主要是由于β相含量不同，其中XOZ面β相含量最高，其耐腐蚀性能最好，因此通过控制成型过程以获得高含量β相可以提高合金耐腐蚀性能，除此之外，合理选择电子束3D打印Ti6Al4V合金的应用表面可以获得更好的耐腐蚀性。

Abstract:: This article investigated the microstructure and electrochemical corrosion properties of electron beam 3D printed Ti6Al4V alloy and the relationship between both. The results indicate that the original β columns that grow along epitaxial direction, parallel to the molding direction (XOZ plane), are mainly composed of columnar grain boundary α phase and cluster α growing along the grain boundary and basketweave microstructure inside the grain. The αsheet orientation of the basket structure is different, and the small rodlike β phase is located between the α sheets. The corrosion resistance of each molding surface were studied by measuring the dynamic polarization curve and electrochemical impedance spectroscopy of the alloy in hydrochloric acid solution. Compared with XOY surface, XOZ surface shows better corrosion resistance, this difference in performance is closely related to the microstructure of the alloy, which mainly reflected in the terms of the content of β phase by means of OM, SEM and TEM. The higher β phase content of the XOZ surface has the better corrosion resistance. Therefore, by controlling the molding process to obtain a high content of β phase, the corrosion resistance of the alloy can be improved. In addition, the application surface of the electron beam 3D printing Ti-6Al-4V alloy should be reasonably selected in the acidic solution to obtain better corrosion resistance.