D0L:10.13374/.issn1001-053x.2013.10.007 第35卷第10期 北京科技大学学报 Vol.35 No.10 2013年10月 Journal of University of Science and Technology Beijing 0ct.2013 温度对Z3CN20-09M不锈钢在含氯高温水中应力 腐蚀行为的影响 陆永浩☒，陈子瑞，朱晓锋 北京科技大学国家材料服役安全科学中心，北京100083 ☒通信作者，E-mail:lu-.yonghao@mater..ustb.edu.cn 摘要研究了温度对核电用Z3CN20-09M不锈钢在含C1一的高温高压水中的应力腐蚀开裂行为的影响.材料的应力腐 蚀开裂敏感性变化趋势与试验温度变化趋势并不一致.320℃时材料的应力腐蚀开裂敏感性最高，290℃时为最低，250 ℃时开裂敏感性介于两者之间.250℃和320℃条件下腐蚀后试样表面形成了内部致密、外部疏松的双层氧化膜，而在 290℃条件下腐蚀后试样形成的是致密的单层氧化膜.大多数点蚀坑产生于铁素体相.应力腐蚀裂纹优先在点蚀坑底部 或相界面形核，并倾向于沿相界面或向铁素体内部扩展.铁素体/奥氏体界面对应力腐蚀裂纹的作用取决于裂纹面与相 界面的取向关系.当裂纹扩展方向平行于相界面时，裂纹易沿着相界扩展：当裂纹扩展方向垂直于相界面时，相界面对 裂纹扩展起阻碍作用. 关键词核电站：不锈钢：温度：应力腐蚀开裂：裂纹萌生：裂纹扩展：相界面 分类号TG142.71:TG172 Effect of test temperature on SCC behavior of Z3CN20-09M stainless steel in high temperature water containing chloride ions LU Yong-hao☒，CHEN Zi-rui,ZHU Xiao-feng National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:lu-yonghao@mater.ustb.edu.cn ABSTRACT The effect of test temperature on the stress corrosion cracking (SCC)behavior of Z3CN20-09M stainless steel was studied in high temperature water containing Cl.It is shown that the changing tendency of sensitivity to SCC is not consistent with test temperature.The sensitivity to SCC achieves maximum at 320 C and minimum at 290 C.and it is in the middle at 250 C.Bi-layer oxidation films with a compact inner layer and a loose outer layer form on the sample surface when the temperature is250℃and320℃；but when the temperature is290℃，there is only a single compact layer oxidation film.Most of corrosion pits form in ferrite.SCC cracks usually initiate preferentially at the bottom of corrosion pits or along austenite/ferrite phase boundaries,and they are inclined to propagate along the phase boundaries or within ferrite.The effect of austenite/ferrite phase boundaries on SCC cracks strongly depends on the relative orientation of SCC cracks to the phase boundaries.When the SCC crack propagates parallel to the phase boundary,it is inclined to propagate along the phase boundary;but when the SCC crack propagates perpendicularly to the phase boundary,the phase boundary hinders its propagation. KEY WORDS nuclear power plants;stainless steel;temperature;stress corrosion cracking;crack initiation;crack propagation:phase boundaries 收稿日期：2012-07-21 基金项目：因家科技重大专项课题资助项目(2011ZX06004-009):中央高校基本科研业务费专项(FRF-TP-09-030B)第 35 卷 第 10 期 北 京 科 技 大 学 学 报 Vol. 35 No. 10 2013 年 10 月 Journal of University of Science and Technology Beijing Oct. 2013 温度对 Z3CN20-09M 不锈钢在含氯高温水中应力 腐蚀行为的影响 陆永浩 ，陈子瑞，朱晓锋 北京科技大学国家材料服役安全科学中心, 北京 100083 通信作者，E-mail:lu yonghao@mater.ustb.edu.cn 摘 要 研究了温度对核电用 Z3CN20-09M 不锈钢在含 Cl− 的高温高压水中的应力腐蚀开裂行为的影响. 材料的应力腐 蚀开裂敏感性变化趋势与试验温度变化趋势并不一致. 320 ℃时材料的应力腐蚀开裂敏感性最高，290 ℃时为最低，250 ℃时开裂敏感性介于两者之间. 250 ℃和 320 ℃条件下腐蚀后试样表面形成了内部致密、外部疏松的双层氧化膜，而在 290 ℃条件下腐蚀后试样形成的是致密的单层氧化膜. 大多数点蚀坑产生于铁素体相. 应力腐蚀裂纹优先在点蚀坑底部 或相界面形核，并倾向于沿相界面或向铁素体内部扩展. 铁素体/奥氏体界面对应力腐蚀裂纹的作用取决于裂纹面与相 界面的取向关系. 当裂纹扩展方向平行于相界面时，裂纹易沿着相界扩展；当裂纹扩展方向垂直于相界面时，相界面对 裂纹扩展起阻碍作用. 关键词 核电站；不锈钢；温度；应力腐蚀开裂；裂纹萌生；裂纹扩展；相界面 分类号 TG142.71; TG172 Effect of test temperature on SCC behavior of Z3CN20-09M stainless steel in high temperature water containing chloride ions LU Yong-hao , CHEN Zi-rui, ZHU Xiao-feng National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China Corresponding author, E-mail: lu yonghao@mater.ustb.edu.cn ABSTRACT The effect of test temperature on the stress corrosion cracking (SCC) behavior of Z3CN20-09M stainless steel was studied in high temperature water containing Cl−. It is shown that the changing tendency of sensitivity to SCC is not consistent with test temperature. The sensitivity to SCC achieves maximum at 320 ℃ and minimum at 290 ℃, and it is in the middle at 250 ℃. Bi-layer oxidation films with a compact inner layer and a loose outer layer form on the sample surface when the temperature is 250 ℃ and 320 ℃; but when the temperature is 290 ℃, there is only a single compact layer oxidation film. Most of corrosion pits form in ferrite. SCC cracks usually initiate preferentially at the bottom of corrosion pits or along austenite/ferrite phase boundaries, and they are inclined to propagate along the phase boundaries or within ferrite. The effect of austenite/ferrite phase boundaries on SCC cracks strongly depends on the relative orientation of SCC cracks to the phase boundaries. When the SCC crack propagates parallel to the phase boundary, it is inclined to propagate along the phase boundary; but when the SCC crack propagates perpendicularly to the phase boundary, the phase boundary hinders its propagation. KEY WORDS nuclear power plants; stainless steel; temperature; stress corrosion cracking; crack initiation; crack propagation; phase boundaries 收稿日期：2012-07-21 基金项目：国家科技重大专项课题资助项目 (2011ZX06004-009); 中央高校基本科研业务费专项 (FRF-TP-09-030B) DOI:10.13374/j.issn1001-053x.2013.10.007