E690高强低合金钢焊接热影响区典型组织在含SO2海洋环境中的应力腐蚀行为对比研究

doi:10.11900/0412.1961.2018.00140

金属学报

2019, Vol. 55

Issue (4): 469-479 DOI: 10.11900/0412.1961.2018.00140

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E690高强低合金钢焊接热影响区典型组织在含SO₂海洋环境中的应力腐蚀行为对比研究

马宏驰^1,²,杜翠薇¹,刘智勇¹(

),李永¹,李晓刚^1,³

1. 北京科技大学腐蚀与防护中心教育部腐蚀与防护重点实验室北京 100083
2. 南京钢铁股份有限公司南京 210035
3. 中国科学院宁波材料技术与工程研究所宁波 315201

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

引用本文:

马宏驰, 杜翠薇, 刘智勇, 李永, 李晓刚. E690高强低合金钢焊接热影响区典型组织在含SO₂海洋环境中的应力腐蚀行为对比研究[J]. 金属学报, 2019, 55(4): 469-479.
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[J]. Acta Metall Sin, 2019, 55(4): 469-479.

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摘要:

采用U形弯试样干湿交替腐蚀的实验方法，结合电化学测试和裂纹扩展行为分析，对比研究了E690钢焊接热影响区热模拟组织在模拟含SO₂海洋薄液环境中的应力腐蚀行为及机理。结果表明，E690钢焊接热影响区组织在含SO₂海洋薄液环境中具有较高的应力腐蚀敏感性，其中细晶热影响区组织与母材的应力腐蚀敏感性相对较低，粗晶和临界热影响区组织在该环境中应力腐蚀敏感性很高，裂纹扩展速率较快，且呈加速扩展之势。不同组织U形弯试样经过5 d干湿交替腐蚀实验后均形成应力腐蚀微裂纹，裂纹萌生于马氏体-奥氏体(M-A)组元与铁素体基体之间微电偶腐蚀形成的点蚀坑处。

关键词 ：高强低合金钢, 焊接热影响区, 应力腐蚀, SO₂, 海洋环境, 干湿交替腐蚀

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

收稿日期: 2018-04-11

ZTFLH:

TG172.3

基金资助:国家自然科学基金项目(Nos.51801011);国家自然科学基金项目(Nos.51671028);国家材料环境腐蚀平台(NECP)项目和中央高校基本科研业务费专项资金项目(No.FRF-TP-18-026A1)

作者简介: 马宏驰，男，1985年生，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00140 或 https://www.ams.org.cn/CN/Y2019/V55/I4/469

图1 U形弯试样的宏观形貌

图2 U形弯截面取样示意图

图3 E690钢母材(BM)和模拟粗晶热影响区(CGHAZ)、细晶热影响区(FGHAZ)、临界热影响区(ICHAZ)组织的SEM像

图4 不同组织经不同时长周浸实验后的开路电位

图5 CGHAZ组织经不同时长周浸实验后的EIS

图6 U形弯试样弧顶表面CGHAZ组织经过不同时长周浸腐蚀实验后微观形貌的SEM像

图7 U形弯试样弧顶表面FGHAZ组织经过不同时长周浸腐蚀实验后微观形貌的SEM像

图8 U形弯试样弧顶表面ICHAZ组织经过不同时长周浸腐蚀实验后微观形貌的SEM像

图9 不同组织经60 d周浸实验后腐蚀产物的XRD谱

图10 图8b插图中ICHAZ组织周浸10 d除锈后表面凸起部分的EDS分析

图11 CGHAZ组织在模拟含SO2海洋环境中经不同时长周浸实验后的裂纹扩展形貌

图12 FGHAZ组织在模拟含SO2海洋环境中经不同时长周浸实验后的裂纹扩展形貌

图13 ICHAZ组织在模拟含SO2海洋环境中经不同时长周浸实验后的裂纹扩展形貌

图14 4种组织在模拟含SO2海洋环境中裂纹扩展深度随时间的变化

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