摘要
本工作采用电化学工作站研究了电子束熔化技术(EBM)成形TC4样品和传统锻造TC4在3.5 wt%NaCl溶液中的电化学腐蚀行为.结果表明EBM成形TC4样品的非平衡微观结构使其与传统锻造的TC4相比,表现出不同的耐腐蚀性.EBM成形TC4样品与锻件TC4相比,EBM成形样品不同平面存在耐蚀性差异,而且EBM水平面大于锻件,EBM垂直面小于锻件.EBM成形TC4样品垂直面出现的腐蚀性能的各向异性主要是β柱状晶导致的.在腐蚀的过程中,点蚀优先发生在α晶界,因为晶界能量较高,形成多孔的钝化层.本项工作有助于丰富增材制造制备TC4合金在航空钛合金领域的腐蚀性能研究.
In this work,the electrochemical dissolution behavior of electron beam melting(EBM)-formed TC4 samples and conventionally forged TC4 in 3.5 wt%NaCl solution was investigated using an electrochemical workstation.The results show that the non-equilibrium microstructure of the EBM formed TC4 samples makes them exhibit different corrosion resistance compared to the conventionally forged TC4.the corrosion resistance of the EBM formed TC4 samples differs in different planes compared to the forged TC4,with the EBM horizontal plane being larger than the forged one,but the EBM vertical plane being smaller than the forged one.the anisotropy of the corrosion properties appearing in the vertical plane of the EBM formed TC4 samples is mainly caused by theβ-columnar grain.In the process of corrosion,pitting preferentially occurs atαgrain boundaries because of the higher grain boundary energy and the formation of porous passivation layers.This work is helpful to enrich the study of corrosion energy of TC4 alloy prepared by additive manufacturing in the field of aerospace titanium alloys.
作者
邓浩
周吕俊
张海成
罗恒军
谢静
向伟
邱文彬
陈龙庆
DENG Hao;ZHOU Lü-Jun;ZHANG Hai-Cheng;LUO Heng-Jun;XIE Jing;XIANG Wei;QIU Wen-Bin;CHEN Long-Qing(Wanhang Die Forging Co.,Ltd.,China National Erzhong Group Co.,Ltd.,Deyang 618013,China;Key Laboratory of Radiation Physics and Technology,Ministry of Education,Institute o£Nuclear Science and Technology,Sichuan University,Chengdu 610064,China;School of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第3期112-118,共7页
Journal of Sichuan University(Natural Science Edition)
基金
四川省科技厅重点研发计划(2022YFG0102,2021YFH0174)。
关键词
TC4钛合金
电子熔化技术
增材制造技术
化学腐蚀
TC4 titanium alloy
Electron melting technology(EBM)
Additive manufacturing technology(AM)
Chemical corrosion
