Today is Email Alert  RSS

Research on Stress Corrosion Behavior of TC4ELI Titanium Alloy in 3.5%NaCl Solution

Expand
  • Luoyang Ship Material Research Institute,Luoyang 471023,China

Received date: 2022-09-15

  Revised date: 2022-10-14

  Accepted date: 2022-11-10

  Online published: 2023-03-15

Abstract

Stress corrosion is one of the main threats to titanium alloys used in marine equipment.In order to provide technical support for the safe service of marine equipment,the TC4ELI titanium alloy used in marine environment was selected as the research object,and its corrosion behavior in 3.5%NaCl solution under different microstructure states was systematically studied by using WOL (wedge-open loading) specimen and static displacement method to measure KISCC.The fracture morphology and crack propagation path of the stress corrosion specimens were observed by optical microscope (OM) and scanning electron microscope (SEM).The element distribution of the crack site was analyzed by secondary ion mass spectrometry (SIMS).Results indicated that the stress corrosion threshold (KISCC) of duplex microstructure (α+β) sheet was 56.01 MPa·m1/2,and the stress corrosion threshold (KISCC) of Widmannstetter structure sheet was greater than 67.48 MPa·m1/2.The fracture surface of stress corrosion specimen was mainly composed of matrix,fatigue preformed zone and tearing zone.There was a stress corrosion zone at the interface between fatigue preformed zone and tearing zone of duplex microstructure specimen.In addition to the main crack,there were some secondary cracks at the crack tip for duplex microstructure specimen.There was no obvious stress corrosion cracking (SCC) feature in Widmannstetter structure specimen.The stress corrosion resistance of the Widmannstetter microstructure was better than that of duplex microstructure.The stress corrosion cracking of TC4ELI alloy duplex microstructure specimen was mainly transgranular fracture,and the hydrogen was easy to accumulate at the crack tip.

Cite this article

LI Zhao-feng, JIANG Peng, ZHANG Xin-jie, YAN Yang-yang, XU Ya-li, SUN Zhi-jie . Research on Stress Corrosion Behavior of TC4ELI Titanium Alloy in 3.5%NaCl Solution[J]. Materials Protection, 2023 , 56(3) : 49 -56 . DOI: 10.16577/j.issn.1001-1560.2023.0059

References

[1] 莫 畏.钛[M].北京:冶金工业出版社,2008.MO W.Titanium[M].Beijing:Metallurgical Industry Press,2008.

[2] 张喜燕,赵永庆,白晨光.钛合金及应用[M].北京:化学工业出版社,2005.ZHANG X Y,ZHAO Y Q,BAI C G.Titanium Alloys and The Applications [M].Beijing: Chemical Industry Press,2005.

[3] SCULLY J C,POWELL D T.Stress corrosion cracking mechanism of titanium alloys at room temperature[J].Corrosion Science,1970,10(10): 719-733.

[4] YIN J G,WU Y S,LU J,et al.Study on electrochemical behavior and SCC susceptibility of TC4 in methanol solution[J].Rare Metal Materials and Engineering,2003,32(6):436-439.

[5] 吴荫顺,姜应律,褚 洪,等.钛合金TA7 在醇溶液中的应力腐蚀敏感性[J].北京科技大学学报,2003,25(1):40-43.WU Y S,JIANG Y L,CHU H,et al.SCC susceptibility of the titanium alloy TA7 in alcohols solution[J].Journal of University of Science and Technology Beijing,2003,25(1):40-43.

[6] 朱玉琴,苏 艳,舒 畅,等.海洋大气对TA15 钛合金应力腐蚀影响研究[J].装备环境工程,2012,9(2):85-88.ZHU Y Q,SU Y,SHU C,et al.Research on influence of marine atmosphere on stress corrosion of TA15 titanium alloy[J].Equipment Environmental Engineering,2012,9(2):85-88.

[7] 山 川.钛合金的应力腐蚀开裂与腐蚀电化学研究[D].青岛:中国海洋大学,2013.SHAN C.The study of stress corrosion cracking behavior and corrosion electrochemical behavior of titanium alloys[D].Qingdao: Ocean University of China,2013.

[8] 马 异.钛金属的应力腐蚀研究[D].成都:四川大学,2006.MA Y.A stress corrosion cracking research on dental titanium and titanium alloy[D].Chengdu: Sichuan University,2006.

[9] 孙志杰,王 洋.钛合金应力腐蚀研究现状及展望[J].材料开发与应用,2020,35(2):94-100.SUN Z J,WANG Y.Research status and prospect of the stress-corrosion of titanium alloys[J].Development and Application of Materials,2020,35(2):94-100.

[10] 孙志华,汤智慧,张晓云,等.TA15 钛合金氢脆和应力腐蚀性能研究:第四届全国腐蚀大会论文集[C].北京:中国腐蚀与防护学会,2003:200-202.SUN Z H,TANG Z H,ZHANG X Y,et al.Study on hrdrogen embrittlement and stress corrosion resistance of TA15 titanium alloy: Proceedings of The 4th National Corrosion Conference [C].Beijing: Chinese Society of Corrosion and Protection,2003: 200-202.

Outlines

/