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中国腐蚀与防护学报  2017, Vol. 37 Issue (1): 9-15    DOI: 10.11902/1005.4537.2016.088
  研究报告 本期目录 | 过刊浏览 |
Inconel625合金在高温水蒸气环境中应力腐蚀开裂裂纹扩展速率研究
张乃强1,岳国强1,吕法彬1,曹琦1,李梦源2,徐鸿1()
1 华北电力大学 电站设备状态监测与控制教育部重点实验室 北京 102206
2 国网节能服务有限公司 北京 102206
Crack Growth Rate of Stress Corrosion Cracking of Inconel 625 in High Temperature Steam
Naiqiang ZHANG1,Guoqiang YUE1,Fabin LV1,Qi CAO1,Mengyuan LI2,Hong XU1()
1 Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
2 State Grid Energy Conservation Service CO. LTD., Beijing 102206, China
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摘要: 

针对700 ℃超超临界汽轮机候选材料镍基合金Inconel 625,在700~750 ℃空气和水蒸气交替环境以及在0~8000 μg/L溶解氧浓度的高温水蒸气环境下进行应力腐蚀裂纹扩展速率 (CGR) 实验研究。采用恒应力强度因子 (K) 的力学加载方式进行加载,采用直流电位降法 (DCPD) 对CGR进行在线检测。结果表明：Inconel 625合金在水蒸气环境中的CGR比空气环境中的大,温度越高CGR越大;随着水蒸气中溶解氧含量的增加,CGR增大。并对温度、介质环境和溶解氧含量对应力腐蚀开裂CGR的影响机理进行了讨论。
关键词 ： 镍基合金,  应力腐蚀开裂,  裂纹扩展速率,  溶解氧    
Abstract：

Stress corrosion crack growth rate (CGR) tests of nickel-based alloy Inconel 625, as a candidate material for 700 ℃ ultra-supercritical steam turbine, has been completed at 700~750 ℃ in environments of alternating air and water vapor, as well as in steam with 0~8000 μg/L dissolved oxygen. The applied load is constant stress with intensity factor (K) and the crack growth rate is detected online by measuring the direct current potential drop (DCPD). Results show that the CGR in water vapor is greater than in air and which increases with increasing temperature and dissolved oxygen content. The mechanisms concerning the influence of temperature, medium environment and dissolved oxygen content on stress corrosion cracking are discussed.
Key words： Nickel-based alloy    stress corrosion cracking    crack growth rate    dissolved oxygen
收稿日期: 2016-06-29     
基金资助:国家自然科学基金 (51471069)
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张乃强
岳国强
吕法彬
曹琦
李梦源
徐鸿

引用本文:

张乃强,岳国强,吕法彬,曹琦,李梦源,徐鸿. Inconel625合金在高温水蒸气环境中应力腐蚀开裂裂纹扩展速率研究[J]. 中国腐蚀与防护学报, 2017, 37(1): 9-15.
Naiqiang ZHANG, Guoqiang YUE, Fabin LV, Qi CAO, Mengyuan LI, Hong XU. Crack Growth Rate of Stress Corrosion Cracking of Inconel 625 in High Temperature Steam. Journal of Chinese Society for Corrosion and protection, 2017, 37(1): 9-15.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.088      或      https://www.jcscp.org/CN/Y2017/V37/I1/9

图1  0.5T-CT试样的尺寸
图2  高温水蒸气环境应力腐蚀裂纹扩展实验系统简图
Test step Temperature / ℃ Medium environment Loading method CGR / mms-1 Duration / h
S1 700 Air Constant K 3.39×10-8 146
S2 700 Water vapor Constant K 5.43×10-8 161
S3 750 Air Constant K 4.66×10-7 145
S4 750 Water vapor Constant K 5.06×10-7 148
S5 725 Air Constant K 1.48×10-7 156
S6 725 Water vapor Constant K 2.08×10-7 172
表1  Inconel 625合金在高温空气和水蒸气中的实验条件和结果
图3  Inconel 625合金在700~750 ℃空气和水蒸气环境中的SCC裂纹扩展长度随时间变化曲线
图4  裂纹扩展实验后Inconel 625合金试样的断面形貌
图5  SEM观察下Inconel 625合金试样的裂纹全貌
Test step DO / μgL-1 Loading method CGR / mms-1 Duration / h
S1 8000 Constant K 2.24×10-7 118
S2 <10 Constant K 8.73×10-8 130
S3 2000 Constant K 1.14×10-7 132
S4 4000 Constant K 1.29×10-7 129
S5 6000 Constant K 1.50×10-7 107
表2  Inconel 625合金在725 ℃下不同溶解氧水蒸气环境中的SCC实验条件和结果
图6  Inconel 625合金在725 ℃水蒸气环境中SCC裂纹扩展长度随溶解氧含量的变化曲线
图7  裂纹扩展速率与温度的Arrhenius图
Temperature / ℃ Air Water vapor Times
CGR / mms-1
700 3.39×10-8 5.43×10-8 1.602
725 1.48×10-7 2.08×10-7 1.405
750 4.66×10-7 5.06×10-7 1.086
表3  空气和水蒸气环境下SCC裂纹扩展速率的对比
图8  Inconel 625合金裂纹扩展速率随溶解氧含量的变化
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