固溶温度对2507双相不锈钢组织与耐蚀性能的影响
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摘要
通过定量金相法、电化学试验和慢应变速率拉伸试验研究了固溶温度对2507双相不锈钢组织和耐腐蚀性能的影响,通过超景深观察了拉伸断口裂纹在2507双相不锈钢两相组织中的分布。结果表明,随着固溶温度的升高,2507双相不锈钢中铁素体相含量升高奥氏体相含量降低,1050℃时两相分布比较均匀相比例接近1∶1,有较好的抗点蚀和应力腐蚀性能;1000℃时有少量σ相在铁素体与奥氏体相界析出;此外2507双相不锈钢拉伸断口裂纹优先在铁素体中产生和传播,并终止于奥氏体。
Phase structure of 2507 duplex stainless steel at different solution treatment temperatures was studied by quantitative metallography,corrosion resistance was researched by electrochemical test and slow strain rate test( SSRT),the tensile fracture morphology was also observed. The results indicate that the content of ferrite phase increases and austenite phase decreases with the increase of solution treatment temperature,when treated at 1050 ℃,the proportion of ferrite phase and austenite phase is about 1∶1,and the resistance to pitting and stress corrosion are all excellent; When treated at 1000 ℃ there is some sigma phase( σ) precipitates in the ferrite / austenite interfaces.Moreover tensile fracture cracks initiate and propagate in ferrite phase preferentially and terminate in austenite phase.
Phase structure of 2507 duplex stainless steel at different solution treatment temperatures was studied by quantitative metallography,corrosion resistance was researched by electrochemical test and slow strain rate test( SSRT),the tensile fracture morphology was also observed. The results indicate that the content of ferrite phase increases and austenite phase decreases with the increase of solution treatment temperature,when treated at 1050 ℃,the proportion of ferrite phase and austenite phase is about 1∶1,and the resistance to pitting and stress corrosion are all excellent; When treated at 1000 ℃ there is some sigma phase( σ) precipitates in the ferrite / austenite interfaces.Moreover tensile fracture cracks initiate and propagate in ferrite phase preferentially and terminate in austenite phase.
引文
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[2]吴玖.双相不锈钢[M].北京:冶金工业出版社,1999.
[3]Tsai Wenta,Chen Mingshan.Stress corrosion cracking behavior of 2205duplex stainless steel in concentrated Na Cl solution[J].Corrosion Science,2000,42(3):545-559.
[4]Hosni M Ezuber,El-Houd A,El-Shawesh F.Effects of sigma phase precipitation on seawater pitting of duplex stainless steel[J].Desalination,2007,207(1/3):268-275.
[5]Muthupandi V,Bala Srinivasan P,Seshadri S K,et al.Effect of weld metal chemistry and heat input on the structure and properties of duplex stainless steel welds[J].Materials Science and Engineering:A,2003,358(1/2):9-16.
[6]Park C J,Rao V S,Kwon H S.Effect of sigma phase on the initiation and propagation of pitting corrosion of duplex stainless steel[J].Corvosion,2005,61(1):76-83.
[7]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):50-54.Wu Zhongzhong,Song Zhigang,Zheng Wenjie,et al.Effect of solution temperature on microstructure and pitting corrosion resistance property of super duplex stainless steel 00Cr25Ni7Mo4N[J].Heat Treatment of Metals,2007,32(8):50-54.
[8]Nilsson J O.Super duplex stainless steel[J].Materials Science and Technology,1992,8(8):685-700.
[9]吴忠忠,陆建生,郑文杰,等.固溶温度对超级双相不锈钢00Cr25Ni7Mo4N组织和性能的影响[J].特殊钢,2006,27(4):11-13.Wu Zhongzhong,Lu Jiansheng,Zheng Wenjie,et al.Influence of solution temperature on structure and properties of super duplex stainless steel 00Cr25Ni7Mo4N[J].Special Steel,2006,27(4):11-13.
[10]乔园园.2205双相不锈钢腐蚀性能的研究[D].西安:西安建筑科技大学,2012:19-21.Qiao Yuanyuan.Study on the corrosion behavior of 2205 duplex stainless steel[D].Xi'an:Xi'an University of Architecture and Technology,2012:19-21.
[11]袁宝林.双相不锈钢中(α+γ)组织对氢脆和应力腐蚀开裂敏感性的影响[J].上海钢研,1985(7):91-92.
[12]孟祥娟,孟繁印,宋文文,等.两种热处理工艺对2205双相不锈钢腐蚀行为的影响[J].腐蚀与防护,2012,33(7):563-566.Meng Xiangjuan,Meng Fanyin,Song Wenwen,et al.Effect of two kinds of heat treatment on corrosion behavior of 2205 duplex stainless steel[J].Corrosion and Protection,2012,33(7):563-566.
[13]宋维锡.金属学[M].北京:冶金工业出版社,1980.
[14]宋志刚,陈斌,郑文杰,等.固溶温度对00Cr22Ni5Mo3N钢组织和力学性能的影响[J].钢铁研究学报,2004,16(6):47-50.Song Zhigang,Chen Bin,Zheng Wenjie,et al.Influence of solution temperature on microstructure and mechanical property of00Cr22Ni5Mo3N[J].Journal of Iron and Steel Research,2004,16(6):47-50.
[15]申鹏,颜海涛,杨振,等.固溶处理对00Cr22Ni5M03N双相不锈钢组织和性能的影响[J].热加工工艺,2012,41(22):207-209.Shen Peng,Yan Haitao,Yang Zhen,et al.Effect of solution treatment on microstructure and property of 00Cr22Ni5Mo3N[J].Hot Working Technology,2012,41(22):207-209.
[16]袁宝林.双相不锈钢中γ相和α相对腐蚀开裂敏感性的影响[J].上海金属,1988,10(1):35-41.