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
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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。
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(Tp) retention time of 1 s, t8/5 value of 14 s, with the variation of Tpas 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 Tpshow a nonlinear variation with the increasing Tp, which were mainly depended on the microstructure characteristics such as the bainite transformation and grain size. The HAZ(Tp=850 ℃) has the best low temperature impact toughness, and with similar electrochemical behavior as the bare Q690 steel.
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(Tp) retention time of 1 s, t8/5 value of 14 s, with the variation of Tpas 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 Tpshow a nonlinear variation with the increasing Tp, which were mainly depended on the microstructure characteristics such as the bainite transformation and grain size. The HAZ(Tp=850 ℃) has the best low temperature impact toughness, and with similar electrochemical behavior as the bare Q690 steel.
引文
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[2]Xu W H,Dong C L,Yang C L,et al.Microstructure and mechanica properties of high-strength steel joints by oscillating arc narrow gap GMAW[J].Weld.Join.,2016,7:32(徐望辉,董春林,杨春利等.高强钢摆动电弧窄间隙GMAW组织与性能研究[J].焊接,2016,7:32)
[3]Wang A H,Peng Y,Xiao H J,et al.Impact fracture behavior of deposited metal of 690 MPa level high strength low alloy steel[J].JMech.Eng.,2012,48(2):73(王爱华,彭云,肖红军等.690MPa级低合金高强钢熔敷金属冲击断裂行为研究[J].机械工程学报,2012,48(2):73)
[4]Chen X Z,Huang Y M.Hot deformation behavior of HSLA stee Q690 and phase transformation during compression[J].J.Alloys Compd.,2015,619:564
[5]Li Y J,Jiang Q L,Bao Y P,et al.Effect of heat input on the microstructure and toughness of heat affect zone of Q690 high strength steel[J].China Sci.,2011,6:98(李亚江,蒋庆磊,暴一品等.焊接热输入对Q690高强钢热影响区组织和韧性的影响[J].中国科技论文,2011,6:98)
[6]Meng Y,Luo P,Hu C,et al.Influence of peak temperature on microstructure and toughness of heat affected zone of Q690 steel[J].Hot Work.Technol.,2013,42(17):43(孟尧,罗鹏,胡聪等.热循环峰值温度对Q690钢热影响区组织与韧性的影响[J].热加工工艺,2013,42(17):43)
[7]Ma H C,Liu Z Y,Du C W,et al.Effect of SO2content on corrosion behavior of high-strength steel E690 in polluted marine atmosphere[J].J.Mech.Eng.,2016,52(16):33(马宏驰,刘智勇,杜翠薇等.SO2质量分数对污染海洋大气环境中高强钢E690腐蚀行为的影响[J].机械工程学报,2016,52(16):33)
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[9]Ma H C,Liu Z Y,Du C W,et al.Effect of cathodic potentials on the SCC behavior of E690 steel in simulated seawater[J].Mater.Sci.Eng.,2015,A642:22
[10]Hao W K,Liu Z Y,Wu W,et al.Electrochemical characterization and stress corrosion cracking of E690 high strength steel in wetdry cyclic marine environments[J].Mater.Sci.Eng.,2018,A710:318
[11]Wu W,Hao W K,Liu Z Y,et al.Corrosion behavior of E690 highstrength steel in alternating wet-dry marine environment with different pH values[J].J.Mater.Eng.Perform.,2015,24:4636
[12]Zhang J,Cai Q W,Wu H B,et al.Mechanical properties and marine atmosphere corrosion behavior of E690 ocean platform steel[J].J.Univ.Sci.Technol.Beijing,2012,34:657(张杰,蔡庆伍,武会宾等.E690海洋平台用钢力学性能和海洋大气腐蚀行为[J].北京科技大学学报,2012,34:657)
[13]Wu B,Cai Q W,Zhang J,et al.Corrosion resistance of E690 platform steel in simulation marine atmosphere[J].Heat Treat.Met.,2011,36(3):26(武博,蔡庆伍,张杰等.E690平台用钢耐海洋大气腐蚀模拟[J]金属热处理,2011,36(3):26)
[14]Yi Y Y,Zheng S D,Yi J L,et al.Narrow gap gas metal arc welding of S960QL steel[J].Electr.Weld.Mach.,2012,42(4):76(易耀勇,郑世达,易江龙等.S960QL钢窄间隙熔化极气体保护焊[J].电焊机,2012,42(4):76)
[15]Wang L W,Liu Z Y,Cui Z Y,et al.In situ corrosion characterization of simulated weld heat affected zone on API X80 pipeline steel[J].Corros.Sci.,2014,85:401
[16]Yin J,Liu T W,Liu W Q.Ultra-fine mc-type precipitates formed during high tempering in a high-strength low-alloy bainitic stee[J].Heat Treat.,2016,31(4):9(殷匠,刘天威,刘文庆.一种高强度低合金贝氏体钢高温回火析出的极细MC相[J].热处理,2016,31(4):9)
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