| Autor: |
LI Zhao-feng, JIANG Peng, ZHANG Xin-jie, YAN Yang-yang, XU Ya-li, SUN Zhi-jie |
| Jazyk: |
čínština |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Cailiao Baohu, Vol 56, Iss 3, Pp 49-56 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1001-1560 |
| DOI: |
10.16577/j.issn.1001-1560.2023.0059 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
