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Acta Metall Sin  2019, Vol. 55 Issue (4): 469-479    DOI: 10.11900/0412.1961.2018.00140
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Comparative Study of Stress Corrosion Cracking Behaviors of Typical Microstructures of Weld Heat-Affected Zones of E690 High-Strength Low-Alloy Steel in SO2-Containing Marine Environment
Hongchi MA1,2,Cuiwei DU1,Zhiyong LIU1(),Yong LI1,Xiaogang LI1,3
1. Key Laboratory for Corrosion and Protection MOE, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2. Nanjing Iron and Steel United Co., Ltd., Nanjing 210035, China
3. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
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Abstract  

With the extensive exploitation of ocean resources, the steels used in ocean engineering have been developed towards the trend of high strength-toughness and thick plates, which consequently causes welding problem and high risk of stress corrosion cracking (SCC). The heat-affected zone (HAZ) of high-strength low-alloy steel undergoes phase transformation during welding thermal cycle and it's generally considered to be most vulnerable to SCC. E690 steel, as a newly-developed high strength steel, is currently the leading kind of steel used in ocean platform for its excellent performance. However, there is few research about its SCC behavior in marine atmosphere, especially in SO2-polluted atmosphere. Therefore, it's of great importance to investigate the SCC behavior and mechanism of simulated HAZ of E690 steel in this environment. However, the HAZ is a narrow zone including various microstructures; thus, the individual performance of different microstructures is inconvenient to study. In this work, various microstructures in HAZ, including coarse grained heat-affected zone (CGHAZ), fine grained heat-affected zone (FGHAZ) and intercritical heat-affected zone (ICHAZ), were simulated by heat treatment according to real HAZ microstructures of E690 steel. A comparative study of SCC behaviors of various HAZ microstructures in simulated SO2-containing marine atmosphere was conducted by using U-bend specimen corrosion test under dry/wet cyclic condition. The results indicated that various HAZ microstructures have high susceptibility to SCC in this environment. The SCC susceptibility of CGHAZ and ICHAZ is very high with a high crack growth rate while that of FGHAZ and parent metal is relatively modest. SCC cracks were initiated after 5 d of cyclic corrosion test for U-bend specimen of various microstructures. The microcracks were initiated from the corrosion pits, which were induced by the galvanic corrosion between martensite-austenite (M-A) constituents and ferritic matrix.

Key words:  high-strength low-alloy steel      weld heat-affected zone      stress corrosion cracking      sulfur dioxide      marine environment      dry/wet cyclic corrosion     
Received:  11 April 2018     
ZTFLH:  TG172.3  
Fund: National Natural Science Foundation of China(Nos.51801011);National Natural Science Foundation of China(Nos.51671028);National Environmental Corrosion Platform (NECP) and Fundamental Research Funds for the Central Universities(No.FRF-TP-18-026A1)
Corresponding Authors:  Zhiyong LIU,Yong LI     E-mail:  liuzhiyong7804@ustb.edu.cn

Cite this article: 

Hongchi MA, Cuiwei DU, Zhiyong LIU, Yong LI, Xiaogang LI. Comparative Study of Stress Corrosion Cracking Behaviors of Typical Microstructures of Weld Heat-Affected Zones of E690 High-Strength Low-Alloy Steel in SO2-Containing Marine Environment. Acta Metall Sin, 2019, 55(4): 469-479.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00140     OR     https://www.ams.org.cn/EN/Y2019/V55/I4/469

Fig.1  Macro-morphology of U-bend specimen
Fig.2  Schematic of cutting for cross-section of U-bend specimen
Fig.3  SEM images of base metal (BM) (a), simulated coarse grained heat-affected zone (CGHAZ) (b), fine grained heat-affected zone (FGHAZ) (c) and intercritical heat-affected zone (ICHAZ) (d) of E690 steel
Fig.4  
Fig.5  
Fig.6  SEM images of CGHAZ of U-bend specimen surface after CCT periods of 5 d (a), 10 d (b), 20 d (c), 30 d (d), 40 d (e), 60 d (f) and 90 d (g) (Insets show the enlarged views)
Fig.7  SEM images of FGHAZ of U-bend specimen surface after CCT periods of 5 d (a), 10 d (b), 20 d (c), 30 d (d), 40 d (e), 60 d (f) and 90 d (g) (Insets show the enlarged views)
Fig.8  SEM images of ICHAZ of U-bend specimen surface after CCT periods of 5 d (a), 10 d (b), 20 d (c), 30 d (d), 40 d (e), 60 d (f) and 90 d (g) (Insets show the enlarged views)
Fig.9  
Fig.10  EDS analysis of marked area in the inset of Fig.8b of simulated ICHAZ after 10 d corrosion test
Fig.11  Cracking morphologies of CGHAZ in simulated marine atmosphere containing SO2 after 30 d (a), 40 d (b), 60 d (c) corrosion test
Fig.12  Cracking morphologies of FGHAZ in simulated marine atmosphere containing SO2 after 30 d (a), 40 d (b), 60 d (c) and 90 d (d) corrosion test
Fig.13  Cracking morphologies of ICHAZ in simulated marine atmosphere containing SO2 after 30 d (a), 40 d (b), 60 d (c) and 90 d (d) corrosion test
Fig.14  Dependence of crack depth on cyclic corrosion time in simulated marine atmosphere containing SO2 (a) and its locally enlarged view (b)
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