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| Stress Corrosion Testing of 7A52 Aluminum Alloy and 25CrMnSiA Steel Weldments in Marine Atmospheric Environment |
| Received:January 30, 2017 Revised:June 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.06.021 |
| KeyWord:high strength aluminum alloy, high strength steel, weld, SCC, marine atmosphere environment |
| Author | Institution |
| ZHANG Lun-wu |
1.No.59 Institute of China Ordnance Industry, Chongqing , China;2.Chongqing Key Laboratory of Environmental Effect and Protection, Chongqing , China |
| ZHENG Lin |
1.No.59 Institute of China Ordnance Industry, Chongqing , China;2.Chongqing Key Laboratory of Environmental Effect and Protection, Chongqing , China |
| ZHU Lei |
1.No.59 Institute of China Ordnance Industry, Chongqing , China;2.Chongqing Key Laboratory of Environmental Effect and Protection, Chongqing , China |
| FENG Xian-he |
1.No.59 Institute of China Ordnance Industry, Chongqing , China;2.Chongqing Key Laboratory of Environmental Effect and Protection, Chongqing , China |
| DOU Shi-tao |
1.No.59 Institute of China Ordnance Industry, Chongqing , China;2.Chongqing Key Laboratory of Environmental Effect and Protection, Chongqing , China |
| ZHOU Shang-qi |
Chongqing University, Chongqing |
| HUANG Wei-gang |
Sichuan University, Chengdu , China |
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| Abstract: |
| Objective To study stress corrosion of butt welding tensile specimen of 7A52 aluminum alloy and 25CrMnSiA steel in marine atmosphere environment. Methods Constant load stress corrosion test device, which was designed and manufactured by ourselves, was adopted to study stress corrosion of 7A52 aluminum alloy butt welding tensile specimen and 25CrMnSiA steel butt welding tensile specimen in marine atmosphere environment. Specimen with cracking or without cracking in the test were analyzed from corrosion morphology, fracture surface morphology, microstructure, microhardness distribution, etc. Results 7A52 aluminum weldments fractured in the weld where Cl- concentrated in second phase particles that contain calcium and/or sulfur promoted stress corrosion cracking of 7A52 aluminum weldments. 25CrMnSiA weldments fractured in the base metal in the marine atmosphere corrosion test, while it was fractured in the weld in the laboratory tensile test. Conclusion Both kinds of weldments have stress corrosion cracking in Hainan marine atmosphere, crack initiated and propagated in the seaward surface which called “wind embrittlement”. |
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