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

doi:10.11900/0412.1961.2018.00140

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 MA^1,²,Cuiwei DU¹,Zhiyong LIU¹(

),Yong LI¹,Xiaogang LI^1,³

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

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.

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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)

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	Hongchi MA
	Cuiwei DU
	Zhiyong LIU
	Yong LI
	Xiaogang LI

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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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