温度、水化学环境及冷加工程度对321不锈钢应力腐蚀裂纹扩展速率的影响

张克乾; 张华; 胡石林; 唐占梅

doi:10.7538/yzk.2020.youxian.0797

温度、水化学环境及冷加工程度对321不锈钢应力腐蚀裂纹扩展速率的影响

中国原子能科学研究院,北京102413

计量
- 文章访问数: 82
- HTML全文浏览量: 0
- PDF下载量: 815
出版历程
- 刊出日期: 2021-06-19

Effect of Temperature, Water-chemical Environment and Cold Work on Stress Corrosion Crack Growth Rate of 321SS

China Institute of Atomic Energy, Beijing 102413, China

摘要

摘要: 压水堆（PWR）一回路水的水化学环境、温度及冷加工程度对一回路管道的应力腐蚀开裂（SCC）具有重要影响，因此研究不同因素对一回路管道材料应力腐蚀开裂的影响具有重要意义。本文采用恒应力场强度因子法研究了不同温度、水化学环境及不同冷加工程度对321不锈钢（321SS）在高温高压水中应力腐蚀裂纹扩展速率（SCCGR）的影响，并研究这些因素的协同作用。研究结果表明，在B-Li及B-Li-O₂环境中，随温度升高材料的SCCGR先增大后减小，而在B-Li-O₂-Cl^-环境中，随温度升高SCCGR不断增大；水中溶氧（DO）及Cl^-对材料的SCCGR有协同促进作用，且O₂的加入对SCCGR的影响较Cl^-大；在B-Li环境中，冷加工对材料的SCCGR影响较小，而在腐蚀性环境（B-Li-O₂、B-Li-O₂-Cl^-）中冷加工对材料的SCCGR影响较大，且腐蚀性环境越强，冷加工对SCCGR影响越大。经实验表明，温度、水化学环境及冷加工程度对321SS应力腐蚀裂纹扩展的影响具有协同作用。
- 应力腐蚀裂纹扩展速率 ,
- 水化学环境 ,
- 温度 ,
- 冷加工 ,
- 协同作用
Abstract: The water-chemical environment, temperature, and cold work have an important influence on the stress corrosion cracking (SCC) of the primary loop pipe of pressurized water reactor (PWR). Therefore, it is of great significance to study the influence of different factors on the SCC of the primary loop pipe. The effect of temperature, water-chemical environment, and cold work on stress corrosion crack growth rate (SCCGR) of 321 stainless steel (321SS) with experiment of constant stress field intensity factor was studied. And the synergistic effect of these factors on SCCGR of 321SS was also studied. It is found that with the increase of temperature, the SCCGR of the materials increases first and then decreases in the B-Li and B-Li-O₂ environments. But SCCGR increases with the temperature in the B-Li-O₂-Cl^- environment. Dissolved oxygen (DO) and Cl^- have synergistic effect on the SCCGR, and the effect of O₂ on SCCGR is greater than that of Cl-. In B-Li environment, cold work has little effect on SCCGR of the material. However, in corrosive environments (B-Li-O₂, B-Li-O₂-Cl^-), cold work has a greater influence on SCCGR of materials, and the stronger the corrosive environment, the greater the impact of cold work on SCCGR. The experimental results show that water-chemical environment, temperature, and cold work have synergistic effect on the stress corrosion crack growth of 321SS.
- stress corrosion crack growth rate ,
- water-chemical environment ,
- temperature ,
- cold work ,
- synergistic effect

HTML全文

参考文献(16)

[1]	DU D, LU H, ZHANG L, et al. Effects of chloride and on stress corrosion cracking of cold worked 316/316L austenitic stainless steel in high temperature water[J]. Corrosion Science, 2016, 110: 134-142.
[2]	ZHANG L, WANG J. Effect of dissolved oxygen content on stress corrosion cracking of a cold worked 316L stainless steel in simulated pressurized water reactor primary water environment[J]. Journal of Nuclear Materials, 2014, 446(1-3): 15-26.
[3]	MEISNAR M, VILALTA-CLEMENTE A, MOODY M, et al. A mechanistic study of the temperature dependence of the stress corrosion crack growth rate in SUS316 stainless steels exposed to PWR primary water[J]. Acta Materialia, 2016, 114: 15-24.
[4]	ARIOKA K, YAMADA T, MIYAMOTO T, et al. Intergranular stress corrosion cracking growth behavior of Ni-Cr-Fe alloys in pressurized water reactor primary water[J]. Corrosion, 2014, 70(7): 695-707.
[5]	LOZANO-PEREZ S, YAMADA T, TERACHI T, et al. Multi-scale characterization of stress corrosion cracking of cold-worked stainless steels and the influence of Cr content[J]. Acta Materialia, 2009, 57(18): 5361-5381.
[6]	ARIOKA K, YAMADA T, TERACHI T, et al. Dependence of stress corrosion cracking for cold-worked stainless steel on temperature and potential, and role of diffusion of vacancies at crack tips[J]. Corrosion, 2008, 64(9): 691-706.
[7]	WANG S, SHOJI T, KAWAGUCHI N. Initiation of environmentally assisted cracking in high-temperature water[J]. Corrosion, 2005, 61(2): 137-144.
[8]	ANDRESEN P L, FORD F P. Life prediction by mechanistic modeling and system monitoring of environmental cracking of iron and nickel alloys in aqueous systems[J]. Materials Science and Engineering: A, 1988, 103(1): 167-184.
[9]	ANDRESEN P L. Perspective and direction of stress corrosion cracking in hot water[C]∥Degradation of Materials in Nuclear Power Systems-Water Reactors. [S. l.]: [s. n.], 2001.
[10]	STAEHLE R, GORMAN J. Quantitative assessment of sub-modes of stress corrosion cracking on the secondary side of steam generator tubing in pressurized water reactors, Part 1[J]. Corrosion, 2003, 59(11): 931-994.
[11]	PENG Q, HOU J, SAKAGUCHI K, et al. Effect of dissolved hydrogen on corrosion of inconel alloy 600 in high temperature hydrogenated water[J]. Electrochimica Acta, 2011, 56(24): 8375-8386.
[12]	ANDRESEN P L, YOUNG L M. Characterization of the roles of electrochemistry, convection and crack chemistry in stress corrosion cracking[C]∥Seventh International Symposium on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors. [S.l.]: [s. n.], 1995.
[13]	XIE X, NING D, CHEN B, et al. Stress corrosion cracking behavior of cold-drawn 316 austenitic stainless steels in simulated PWR environment[J]. Corrosion Science, 2016, 112: 576-584.
[14]	ARIOKA K, MIYAMOTO T, YAMADA T, et al. Role of cavity formation in crack initiation of cold-worked carbon steel in high-temperature water[J]. Corrosion, 2013, 69(5): 487-496.
[15]	GARCÍA C, MARTÍN F, de TIEDRA P, et al. Effects of prior cold work and sensitization heat treatment on chloride stress corrosion cracking in type 304 stainless steels[J]. Corrosion Science, 2001, 43(8): 1519-1539.
[16]	LU W F, LAI C L, HUANG J Y. Effects of hydrogen water chemistry on stress corrosion cracking behavior of cold-worked 304L stainless steel in high-temperature water environments[J]. Materials Transactions, 2014, 55(3): 506-510.