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

作者:: 余志君1; 陳卓2; 祁廣源3; 曲壽江1; (1.同濟大學(xué)材料科學(xué)與工程學(xué)院，上海 201804)
(2.航天海鷹(哈爾濱)鈦業(yè)有限公司黑龍江哈爾濱 150028)
(3.大連供電公司，遼寧大連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:: 研究了電子束3D打印Ti6Al4V合金的微觀組織和電化學(xué)腐蝕性能之間的關(guān)系。研究表明，在平行于成型方向(XOZ面)，觀察到豎直生長的原始β柱狀晶，其主要由晶界柱狀α、沿晶界生長的集束α以及β晶內(nèi)網(wǎng)籃狀α組成，其中，網(wǎng)籃組織內(nèi)部α片層取向各異，細(xì)小的棒狀β相位于α片層之間。通過在1 mol/L HCl溶液中對合金動態(tài)極化曲線和電化學(xué)阻抗譜的測量來研究各成型面抗腐蝕性能，與XOY面相比，XOZ面表現(xiàn)出更好的耐腐蝕性，這種性能的差異與合金顯微組織密切相關(guān)，利用OM、SEM和TEM等分析手段可得，各個成型面抗腐蝕性能差異主要是由于β相含量不同，其中XOZ面β相含量最高，其耐腐蝕性能最好，因此通過控制成型過程以獲得高含量β相可以提高合金耐腐蝕性能，除此之外，合理選擇電子束3D打印Ti6Al4V合金的應(yīng)用表面可以獲得更好的耐腐蝕性。

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.