固溶温度对2507双相不锈钢时效后组织及性能的影响
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摘要
研究了2507双相不锈钢经过不同固溶处理后微观组织演变和合金元素分布。并在此基础上研究了不同固溶态样品经过短时时效后的微观组织演变规律和晶间腐蚀性能变化。结果表明,随着固溶温度提高,铁素体比例提高,铁素体形成元素Cr、Mo在铁素体中含量下降,并且短时时效后析出相数量更少;固溶温度更高的样品晶间腐蚀程度更低。
The microstructure evolution and alloy elements distribution of 2507 duplex stainless steel after different solution treatments were studied. On this basis, the microstructure evolution law and intergranular corrosion property change of different solution state samples after short-time aging were also researched. The results show that with the increase of solid solution temperature, the ferrite proportion increases, the content of ferrite forming elements of Cr and Mo decreases in ferrite,and the amount of precipitated phase is less after short time aging. When the solution temperature is higher, the intergranular corrosion of the samples is lower.
The microstructure evolution and alloy elements distribution of 2507 duplex stainless steel after different solution treatments were studied. On this basis, the microstructure evolution law and intergranular corrosion property change of different solution state samples after short-time aging were also researched. The results show that with the increase of solid solution temperature, the ferrite proportion increases, the content of ferrite forming elements of Cr and Mo decreases in ferrite,and the amount of precipitated phase is less after short time aging. When the solution temperature is higher, the intergranular corrosion of the samples is lower.
引文
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[2]Sato Y S,Kokawa H.Preferential precipitation site of sigma phase in duplex stainless steel weld metal[J].Scripta Materialia,1999,40(6):659-663.
[3]Sathirachinda N,Pettersson R,Pan J.Depletion effects at phase boundaries in 2205 duplex stainless steel characterized with SKPFM and TEM/EDS[J].Corrosion Science,2009,51(8):1850-1860.
[4]Zhang W.Statistical model for intergranular corrosion growth kinetics[J].Corrosion Science,2003,45(2):353-370.
[5]Feng S.Precipitation kinetics of Cr2N in high nitrogen austenitic stainless steel[J].Journal of Iron and Steel Research,International,2008,15(6):72-77.
[6]Wilms M E.The effect of sigma-phase precipitation at 800℃on the corrosion resistance in sea-water of a high alloyed duplex stainless steel[J].Corrosion Science,1994,36(5):871-881.
[7]Angelini E B,De Benedetti,Rosalbino F.Microstructural evolution and localized corrosion resistance of an aged superduplex stainless steel[J].Corrosion Science,2004,46(6):1351-1367.
[8]Ghosh S K,Mondal S.High temperature ageing behaviour of a duplex stainless steel[J].Materials Characterization,2008,59(12):1776-1783.
[9]Ha H.Interpretation of the relation between ferrite fraction and pitting corrosion resistance of commercial 2205 duplex stainless steel[J].Corrosion Science,2014,89:154-162.
[10]Deng B.Application of the modified electrochemical potentiodynamic reactivation method to detect susceptibility to intergranular corrosion of a newly developed lean duplex stainless steel LDX2101[J].Corrosion Science,2010,52(3):969-977.
[11]Hong JEvaluation of aged duplex stainless steel UNS S32750susceptibility to intergranular corrosion by optimized double loop electrochemical potentiokinetic reactivation method[J].Corrosion Science,2013,68:249-255.
[12]Moura V S.Influence of microstructure on the corrosion resistance of the duplex stainless steel UNS S31803[J].Materials Characterization,2008,59(8):1127-1132.