含Ti铸造双相不锈钢点蚀行为研究
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摘要
借助电化学极化曲线以及阻抗法研究了合金元素Ti的加入对铸造双相不锈钢点蚀行为的影响,通过扫描电子显微镜(SEM)、能谱分析(EDS)以及X射线衍射(XRD)研究了铸造双相不锈钢在发生点蚀前后微观形貌、元素分布以及析出相种类的变化并探讨点蚀的萌生机制。结果表明:双相不锈钢中,点蚀主要发生在奥氏体相以及相界处,产生点蚀的原因是奥氏体相中富Cr区的存在以及相界碳化物的析出。在双相不锈钢中加入少量合金元素Ti,可以提高双相不锈钢的耐点蚀能力。
Effect of Ti addition on the pitting corrosion behavior of casting duplex stainless steel was studied by means of potentiodynamic measurement and impedance spectroscopy as well as scanning electron microscope(SEM) along with energy-dispersive spectroscopy(EDS) and X-Ray Diffractometer(XRD). It turned out that pitting corrosion occurred mainly on the austenite phase and phase boundaries because of the existence of Cr-rich zone and the precipitation of carbides in the austenite phase and at phase boundaries respectively. Pitting corrosion resistance of duplex stainless steel could be improved through the addition of Ti.
Effect of Ti addition on the pitting corrosion behavior of casting duplex stainless steel was studied by means of potentiodynamic measurement and impedance spectroscopy as well as scanning electron microscope(SEM) along with energy-dispersive spectroscopy(EDS) and X-Ray Diffractometer(XRD). It turned out that pitting corrosion occurred mainly on the austenite phase and phase boundaries because of the existence of Cr-rich zone and the precipitation of carbides in the austenite phase and at phase boundaries respectively. Pitting corrosion resistance of duplex stainless steel could be improved through the addition of Ti.
引文
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[2]Lang X,Zhao L,Wang J C,et al.Advances in research and application of duplex stainless steel for marine castings in China[J].Foundry,2011,60:459(朗宵,赵岭,王景成等.我国船用铸造双相不锈钢的研究和应用进展[J].铸造,2011,60:459)
[3]El-Batahgy A,Zaghloul B.Fatigue failure of an offshore condensate recycle line in a natural gas production field[J].Mater.Charact.,2005,54:246
[4]Zhang G X,Li S Q.Performance of duplex stainless steel and its application in petrochemical industry[J].Petro Chem.Equip.Technol.,2007,28(4):63(张国信,李双权.双相不锈钢的性能及其在石化行业的应用[J].石油化工设备技术,2007,28(4):63)
[5]Pohl M,Storz O,Glogowski T.Effect of intermetallic precipitations on the properties of duplex stainless steel[J].Mater.Charact.,2007,58(1):65
[6]Wu Z Z,Song Z G,Zheng W J,et al.Effect of solution temperature on microstructure and pitting corrosion resistance property of super duplex stainless steel 00Cr25Ni7Mo4N[J].Heat Treat.Metals,2007,32(8):50(吴忠忠,宋志刚,郑文杰等.固溶温度对00Cr25Ni7Mo4N超级双相不锈钢显微组织及耐点蚀性能的影响[J].金属热处理,2007,32(8):50)
[7]Wang Y Q,Lin S H,Li N,et al.Overview ofσphase influencing on mechanical properties of stainless steels[J].J.Iron Steel Res.,2016,28(2):1(王永强,林苏华,李娜等.σ相析出对不锈钢力学性能的影响概述[J].钢铁研究学报,2016,28(2):1)
[8]Lippold J C,Kotecki D J.Welding Metallurgy and Weldability of Stainless Steels[M].New York:John Wiley&Sons Inc.,2005
[9]Gholami M,Hoseinpoor M,Moayed M H.A statistical study on the effect of annealing temperature on pitting corrosion resistance of2205 duplex stainless steel[J].Corros.Sci.,2015,94:156
[10]Lopez N,Cid M,Puiggali M.Influence of o-phase on mechanical properties and corrosion resistance of duplex stainless steels[J].Corros.Sci.,1999,41(8):1615
[11]Nilsson J O,Kangas P,Wilson A,et al.Mechanical properties,microstructural stability and kinetics ofσ-phase formation in 29Cr-6Ni-2Mo-0.38N superduplex stainless steel[J].Metall.Mater.Trans.,2000,31A:35
[12]Gu Y,Zhan Z L,Rong F.Effect of Nb and Ti on the toughness of445M ferritic stainless steel[J].J.Iron Steel Res.,2012,24(1):31(顾玥,詹肇麟,荣凡.铌、钛对445M铁素体不锈钢韧性的影响[J].钢铁研究学报,2012,24(1):31)
[13]Moayed M H,Newman R C.Deterioration in critical pitting temperature of 904L stainless steel by addition of sulfate ions[J].Corros.Sci.,2006,48(11):3513
[14]Ye C,Du N,Zhao Q,et al.Progress in research of pitting corrosion behavior and research methods of stainless steels[J].Corros.Protect.,2014,35:271(叶超,杜楠,赵晴等.不锈钢点蚀行为及研究方法的进展[J].腐蚀与防护,2014,35:271)
[15]Kim S T,Jang S H,Lee I S,et al.Effects of solution heat-treatment and nitrogen in shielding gas on the resistance to pitting corrosion of hyper duplex stainless steel welds[J].Corros.Sci.,2011,53(5):1939
[16]Zheng C B,Shen X L,Tang Z J.Effect of solution treatment temperature on phase structure and corrosion resistance of 2507 duplex stainless steel[J].Heat Treat.Metals,2015,40(8):124(郑传波,申小兰,唐祝君.固溶温度对2507双相不锈钢组织与耐蚀性能的影响[J].金属热处理,2015,40(8):124)
[17]Yan W,Shan Y Y,Yang K.Effect of Ti N inclusions on the impact toughness of low-carbon microalloyed steels[J].Metall.Mater.Trans.,2006,37A:2147
[18]Tian J X,Zhang C,Wang H P,et al.Effect of Nb,Ti on pitting corrosion resistant of high-pure ferritic stainless steel,edited by Steelmaking Committee[A].The 17thCSM Annual Steel Making Conference Proceedings(Part B)[C].Hangzhou:The Chinese Society for Metals,2013(田俊行,张驰,王宏坡等.Nb、Ti对高纯铁素体不锈钢耐点蚀性能的影响[A].第十七届全国炼钢学术会议论文集(B卷)[C].杭州:中国金属学会,2013)
[19]Macdonald D D.The point defect model for the passive state[J].J.Electrochem.Soc.,1992,139:3434