中温时效对超级双相不锈钢2507组织及性能的影响
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摘要
双相不锈钢2507耐蚀性优异,但热处理不当时会影响其组织和性能。借助光学显微镜和透射电子显微镜研究了超级双相不锈钢2507在不同温度(360,580℃)时效处理后的组织结构和力学性能,并采用动电位极化曲线结合FeCl3浸泡方法研究其耐点蚀性能。结果表明:不同温度时效处理后,双相不锈钢2507均析出纳米级富铬α'相,其中360℃时效产生α'相与α相共格,580℃时效产生α'相与α相非共格;α'相主要在α相内、α/α和α/γ晶界处析出;当α'相与α相非共格时,试样强度和韧性变化更为明显; 360℃时效试样较580℃时效试样能更好地抑制稳定点蚀的萌生和发展长大。
The microstructures and mechanical properties of super duplex stainless steel 2507 after aging treatment at different temperatures( 360 ℃ and 580 ℃) were investigated by means of optical microscope( OM) and transmission electron microscopy( TEM),and the pitting corrosion resistance was investigated by combining potentiodynamic polarization curves and Fe Cl3 immersion method. Results showed that the nanoscale chromium-rich α'phase was produced after aging treatment with different temperature. Among them,the α'phase at 360 ℃ was coherent with the α phase,while the α'phase at 580 ℃ was non-coherent with the α phase. The α'phase was mainly precipitated in the αphase,α/α and α/γ grain boundaries. When α'phase was non-coherent with α phase,the strength and toughness changed more obviously.Moreover,pitting corrosion test showed that the sample after aging at 360 ℃ was better than the sample aged at 580 ℃ to inhibit the steady pitting initiation and steady pitting growth.
The microstructures and mechanical properties of super duplex stainless steel 2507 after aging treatment at different temperatures( 360 ℃ and 580 ℃) were investigated by means of optical microscope( OM) and transmission electron microscopy( TEM),and the pitting corrosion resistance was investigated by combining potentiodynamic polarization curves and Fe Cl3 immersion method. Results showed that the nanoscale chromium-rich α'phase was produced after aging treatment with different temperature. Among them,the α'phase at 360 ℃ was coherent with the α phase,while the α'phase at 580 ℃ was non-coherent with the α phase. The α'phase was mainly precipitated in the αphase,α/α and α/γ grain boundaries. When α'phase was non-coherent with α phase,the strength and toughness changed more obviously.Moreover,pitting corrosion test showed that the sample after aging at 360 ℃ was better than the sample aged at 580 ℃ to inhibit the steady pitting initiation and steady pitting growth.
引文
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[16]吴玮巍,陈红星,齐慧滨,等.不锈钢点蚀Fe Cl3浸泡方法与电化学方法的对比研究:第五届全国腐蚀大会论文集[C].北京:中国腐蚀与防护学会,2010:1-9.
[2]何燕,张彩丽,王剑等.时效温度对镍不锈钢S2101晶间腐蚀行为影响的研究[J].腐蚀科学与防护技术,2016,28(3):241-246.
[3]IACOVIELLO F,CASARIB F,GIALANELLAB S.Effect of“475℃embrittlement”on duplex stainless steels localized corrosion resistance[J].Corrosion Science,2005,47(4):909-922.
[4]查小琴,邵军,张丽娟.不锈钢晶间腐蚀测试方法[J].材料开发与应用,2009,24(3):60-65.
[5]HONG J F,HAN D,HAN H,et al.Evaluation of aged duplex stainless steel UNS S32750 susceptibility to intergranular corrosion by optimized double loop electrochemical potentiokinetic reactivation method[J].Corrosion Science,2013,68:249-255.
[6]张娟娟,宁天信,王嘉敏,等.双相不锈钢00Cr25Ni7Mo4N敏化过程中的脆化机理研究[J].材料开发与应用,2009,24(5):21-24.
[7]陈炜.时效处理对S32750双相不锈钢显微组织和力学性能的影响[J].热处理,2017,32(4):10-13.
[8]WENG K L,CHEN H R,YANG J R.The low-temperature aging embrittlement in a 2205 duplex stainless steel[J].Materials Science&Engineering A,2004,379:119-132.
[9]丰涵,贾鸿屹,宋志刚,等.中温时效对022Cr21Ni2Mn5N钢析出行为及冲击韧性的影响[J].钢铁研究学报,2017,29(2):137-143.
[10]索科尔.双相不锈钢[M].北京:原子能出版社,1979:68.
[11]RAMANARAYAN H,ABINANDANAN T A.Grain boundary effects on spinodal decomposition:II.Discontinuous microstructures[J].Acta Materialia,2004,52(4):921-930.
[12]LO K H.Transformation and magnetic behaviour of duplex stainless steel[D].Hong Kong:City University of Hong Kong,2007:35.(下转第74页)
[13]BADJI R,BOUABDALLAH M,BACROIX B,et al.Phase transformation and mechanical behavior in annealed 2205duplex stainless steel welds[J].Materials Characterization,2008,59(4):447-453.
[14]PETTERSSON N,WESSMAN S,THAVANDER M,et al.Nanostructure evolution and mechanical property changes during aging of a super duplex stainless steel at 300℃[J].Materials Science&Engineering A,2015,647:241-248.
[15]赵天字,陈吉,孙彦伟,等.2205双相不锈钢在硫酸中的腐蚀性能[J].腐蚀与防护,2015,3(6):535-539.
[16]吴玮巍,陈红星,齐慧滨,等.不锈钢点蚀Fe Cl3浸泡方法与电化学方法的对比研究:第五届全国腐蚀大会论文集[C].北京:中国腐蚀与防护学会,2010:1-9.