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《材料导报》期刊社  2018, Vol. 32 Issue (3): 373-377    https://doi.org/10.11896/j.issn.1005-023X.2018.03.005
     材料与可持续发展(一)—— 面向洁净能源的先进材料 ｜ |
核电主管道不锈钢在高温高压水环境下的疲劳裂纹萌生行为
武焕春1,薛飞1,李成涛1,方可伟1,杨滨2,宋西平3
1 苏州热工研究院有限公司寿命管理技术中心,苏州 215004
2 北京科技大学钢铁共性技术协同创新中心,北京 100083
3 北京科技大学新金属材料国家重点实验室,北京 100083
Fatigue Crack Initiation Behaviors of Nuclear Power Plant Main Pipe Stainless Steel in Water with High Temperature and High Pressure
Huanchun WU1,Fei XUE1,Chengtao LI1,Kewei FANG1,Bin YANG2,Xiping SONG3
1 Life Assessment Center, Suzhou Nuclear Power Research Institute, Suzhou 215004
2 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083
3 State Key Laboratoryfor Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
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摘要 

利用腐蚀疲劳测试系统研究了高温高压水环境下两种压水堆核电站一回路主管道用不锈钢的腐蚀疲劳裂纹萌生行为。结果表明,316LN奥氏体不锈钢的裂纹主要在材料表面的驻留滑移带处萌生,少量裂纹在两簇驻留滑移带交界的亚晶界面处。含有少量铁素体的Z3CN20.09M奥氏体不锈钢的疲劳裂纹依次在试样表面的驻留滑移带处、相界处和点蚀坑处萌生,但主要是在驻留滑移带处。通过研究高温高压水环境下氧化膜的组成和腐蚀疲劳试样横截面的形貌,分析了疲劳裂纹在滑移带处萌生的机理。最后对比分析两种不锈钢裂纹萌生机制的异同,并讨论了铁素体对材料腐蚀疲劳性能的影响。
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武焕春
薛飞
李成涛
方可伟
杨滨
宋西平
关键词:  不锈钢  腐蚀疲劳  裂纹萌生  高温高压水    
Abstract: 

The behaviors of fatigue crack initiation of 316LN and Z3CN20.09M austenite stainless steels (ASSs) were studied by corrosion fatigue test system in high temperature water. The results indicated that the fatigue cracks were mainly initiated at the persistent slip bands (PSBs) on the surface of 316LN ASS. Only a few cracks were initiated at the sub-grain boundaries. While the fatigue cracks were sequentially initiated at PSBs, phase boundaries and corrosion pits of the Z3CN20.09M ASS containing a little part of ferrite, and they were also mainly initiated at PSBs. The crack initiation mechanism at PSBs was analyzed based on composition of oxide film and morphology of cross section of the specimens tested in high temperature water. Moreover, the difference of the crack initiation mechanisms for two kinds of stainless steel was analyzed. Finally, the effect of the ferrite phase on corrosion fatigue property was summarized.
Key words:  stainless steel    corrosion fatigue    crack initiation    high temperature and high pressure water
出版日期:  2018-02-10      发布日期:  2018-02-10
ZTFLH:  TG142.71  
基金资助: 中国博士后基金(2016M601887);国家自然科学基金(51375182)
作者简介:  武焕春:男,1986年生,博士,主要研究方向为核电用不锈钢的环境失效行为 E-mail: wuhuanchun1@163.com
引用本文:    
武焕春, 薛飞, 李成涛, 方可伟, 杨滨, 宋西平. 核电主管道不锈钢在高温高压水环境下的疲劳裂纹萌生行为[J]. 《材料导报》期刊社, 2018, 32(3): 373-377.
Huanchun WU, Fei XUE, Chengtao LI, Kewei FANG, Bin YANG, Xiping SONG. Fatigue Crack Initiation Behaviors of Nuclear Power Plant Main Pipe Stainless Steel in Water with High Temperature and High Pressure. Materials Reports, 2018, 32(3): 373-377.
链接本文:  
https://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.03.005  或          https://www.mater-rep.com/CN/Y2018/V32/I3/373
Element C Si Mn P S Cr Ni Mo N Fe
316LN 0.02 0.75 2.00 0.045 0.030 17.01 12.53 2.48 0.14 Balance
Z3CN20.09M 0.024 1.09 1.11 0.023 0.039 20.16 9.06 0.26 0.033 Balance
表1  316LN 和Z3CN20.09M奥氏体不锈钢的化学成分(质量分数/%)
Wave shape Strain amplitude Strain rate Temperature Pressure Dissolved oxygen pH Conductivity
Triangular wave ±0.5%,±1.0% 0.1% ·s-1 320/290 ℃ 11/8 MPa 10 mg/L 6.6 0.15 μS/cm
表2  腐蚀疲劳试验参数与水化学参数
图1  316LN不锈钢在320 ℃水环境中不同应变幅下试样表面的腐蚀疲劳裂纹在滑移带处萌生的形貌
图2  316LN不锈钢试样在320 ℃高温高压水环境下形成的氧化膜的 XPS测试结果:(a)Fe 2p3/2,(b)Cr 2p3/2,(c)Ni 2p3/2,(d)Mo 3d3/2
图3  腐蚀疲劳过程中试样表面滑移带的运动模型
图4  316LN不锈钢在320 ℃高温高压水中不同应变幅下腐蚀疲劳实验后试样横截面的形貌
图5  316LN不锈钢在320 ℃水环境中不同应变幅下的腐蚀疲劳裂纹在亚晶界处萌生的形貌
图6  Z3CN20.09M不锈钢在290 ℃水环境下腐蚀疲劳裂纹在相界处萌生的形貌
图7  Z3CN20.09M不锈钢在290 ℃水环境下腐蚀疲劳裂纹在点蚀坑处萌生的形貌
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