基于窄间隙焊接的热模拟峰值温度对Q690高强钢腐蚀行为的影响

doi:10.11902/1005.4537.2017.201

中国腐蚀与防护学报

2018, Vol. 38

Issue (5): 447-454 DOI: 10.11902/1005.4537.2017.201

研究报告

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基于窄间隙焊接的热模拟峰值温度对Q690高强钢腐蚀行为的影响

王凯¹(

), 易耀勇², 卢清华¹, 易江龙², 江泽新³, 马金军³, 张宇⁴

1 佛山科学技术学院机电工程学院佛山 528231
2 广东省焊接技术研究所 (广东省中乌研究院) 广州 510650
3 广船国际有限公司广州 511462
4 江苏省 (沙钢) 钢铁研究院张家港 215625

Effect of Peak Temperatures on Corrosion Behavior of Thermal Simulated Narrow-gap Weld Q690 High Strength Steel

Kai WANG¹(

), Yaoyong YI², Qinghua LU¹, Jianglong YI², Zexin JIANG³, Jinjun MA³, Yu ZHANG⁴

1 School of Mechatronics Engineering, Foshan University, Foshan 528231, China
2 Guangdong Welding Institute (China-Ukraine E. O. Paton Institute of Welding), Guangzhou 510650, China
3 Guangzhou Shipyard International Co., Ltd., Guangzhou 511462, China
4 Institute of Research of Iron and Steel, Sha-steel, Zhangjiagang 215625, China

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摘要:

利用Gleeble3800热模拟实验机模拟了Q690高强钢焊接热影响区在不同峰值温度条件下的单道次热循环过程。测定Q690高强钢母材及不同峰值温度条件下热影响区试样的力学性能及电化学特性,观察不同峰值温度下Q690高强钢热影响区的热模拟显微组织及电化学实验腐蚀形貌。结果表明,不同热模拟峰值温度下,Q690高强钢的热影响区组织呈现出非线性变化,其力学性能和腐蚀行为取决于显微组织中的贝氏体组织的转变与晶粒大小。当峰值温度为850 ℃时,热影响区具有最佳的低温冲击韧性以及和Q690高强钢母材相近的电化学腐蚀特性。

关键词 ： Q690高强钢, 窄间隙焊接, 热模拟, 显微组织, 电化学腐蚀

Abstract：

According to the thermal cycle process of Q690 high strength steel by narrow-gap (NG) welding, the thermal simulated NG weldings were carried out by a Gleeble 3800 thermal simulation test machine to prepare weld joints with different HAZs of Q690 high strength steel at different peak temperature in a single thermal cycle. The parameters of thermal simulated NG welding are as follows: preheat temperature of 150 ℃, peak temperature (T_p) retention time of 1 s, t_8/5 value of 14 s, with the variation of T_p as 500, 650, 850, 950 and 1350 ℃. The effect of welding parameters on the properties of Q690 high strength steel were investigated and the relationship between the micro-structural factors, mechanical properties and electrochemical behavior were discussed. The microstructure of the thermal simulated weld Q690 HSLA steel was observed by OM and SEM. The electrochemical behavior of them in a 3.5% (mass fraction) NaCl aqueous solution at room temperature was assessed by means of open circuit potential (OCP) measurement, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization measurement. The mechanical properties and electrochemical behavior of the Q690 steel HAZ at different T_p show a nonlinear variation with the increasing T_p, which were mainly depended on the microstructure characteristics such as the bainite transformation and grain size. The HAZ (T_p=850 ℃) has the best low temperature impact toughness, and with similar electrochemical behavior as the bare Q690 steel.

Key words： Q690 high strength steel narrow-gap welding thermal simulation microstructure electrochemical corrosion

收稿日期: 2017-11-24

ZTFLH:

TG115.6+2

基金资助:国家自然科学基金 (51601043) 和国际科技合作计划 (2014DFR50310)

作者简介:

作者简介王凯,男,1981年生,博士,高级工程师

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引用本文:

王凯, 易耀勇, 卢清华, 易江龙, 江泽新, 马金军, 张宇. 基于窄间隙焊接的热模拟峰值温度对Q690高强钢腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2018, 38(5): 447-454.
Kai WANG, Yaoyong YI, Qinghua LU, Jianglong YI, Zexin JIANG, Jinjun MA, Yu ZHANG. Effect of Peak Temperatures on Corrosion Behavior of Thermal Simulated Narrow-gap Weld Q690 High Strength Steel. Journal of Chinese Society for Corrosion and protection, 2018, 38(5): 447-454.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.201 或 https://www.jcscp.org/CN/Y2018/V38/I5/447

图1 Q690高强钢显微硬度和冲击韧性随焊接热模拟处理峰值温度的变化

图2 Q690高强钢母材及其在不同焊接热模拟峰值温度处理后的显微组织OM像

图3 Q690高强钢母材及其在不同焊接热模拟峰值温度处理后的显微组织SEM像

图4 Q690高强钢母材及其在不同焊接热模拟峰值温度处理后在3.5%NaCl溶液中的开路电位-时间曲线

图5 经不同热模拟峰值温度处理的Q690高强钢试样在3.5%NaCl溶液中的EIS谱

图6 Q690钢试样的电化学阻抗谱等效电路图

表1 阻抗谱等效电路元件参数值

图7 经不同热模拟峰值温度处理的Q690高强钢试样在3.5%NaCl溶液中的动电位极化曲线

表2 动电位极化参数拟合结果

图8 3种典型热模拟峰值温度处理的Q690高强钢试样电化学实验后的腐蚀形貌

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