Effect of mass concentration of sulfate ions in high temperature water on stress corrosion cracking behavior of Z3CN20.09 stainless steel

ZHANG Jinzhe; CHEN Hongyu; ZHANG Yu; WU Di

doi:10.19666/j.rlfd.202201034

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Effect of mass concentration of sulfate ions in high temperature water on stress corrosion cracking behavior of Z3CN20.09 stainless steel

Thermal Power Generation Vol. 51, Issue 9, Pages: 162-169(2022)

更新时间：2025-09-28

- Effect of mass concentration of sulfate ions in high temperature water on stress corrosion cracking behavior of Z3CN20.09 stainless steel
- 作者机构：
  
  大亚湾核电运营管理有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202201034
  CLC： TM623;TG172.9
- Published：2022
- 稿件说明：
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ZHANG Jinzhe, CHEN Hongyu, ZHANG Yu, et al. Effect of mass concentration of sulfate ions in high temperature water on stress corrosion cracking behavior of Z3CN20.09 stainless steel[J]. Thermal Power Generation, 2022, 51(9): 162-169.
DOI：

ZHANG Jinzhe, CHEN Hongyu, ZHANG Yu, et al. Effect of mass concentration of sulfate ions in high temperature water on stress corrosion cracking behavior of Z3CN20.09 stainless steel[J]. Thermal Power Generation, 2022, 51(9): 162-169. DOI： 10.19666/j.rlfd.202201034.

摘要

采用慢应变速率试验(SSRT)测试了模拟压水堆核电厂一回路水中硫酸根离子(SO_4~(2–))质量浓度对Z3CN20.09铸造奥氏体不锈钢(CASS)应力腐蚀开裂(SCC)敏感性的影响。测试结果表明:Z3CN20.09不锈钢在6种水环境中进行SSRT后断口附近都出现不同程度的颈缩现象;在不含SO_4~(2–)的正常压水堆(PWR)水质中

不锈钢的破断延伸率最大

断裂面均为韧窝状的断口

SCC抗力强;高温水中SO_4~(2–)质量浓度为100～1 500μg/L时

SSRT断口出现明显的SCC现象

断口表现为脆性+韧窝混合型;不同相及相界对SO_4~(2–)腐蚀的敏感性和SO_4~(2–)对合金表面钝化膜的劣化作用是促进Z3CN20.09铸造奥氏体不锈钢局部腐蚀和SCC的重要因素。

Abstract

By slow strain rate test(SSRT)

the effect of sulfate mass concentration in primary circuit water of the pressurized water reactor(PWR) on stress corrosion cracking(SCC) sensitivity of Z3CN20.09 casted austenitic stainless steel(CASS) was investigated. The results show that

necking occurred near the fracture after the SSRT of Z3CN20.09 CASS in 6 water environments. In normal PWR water containing no SO_4~(2–)

the elongation to fracture of Z3CN20.09 CASS was the largest

and the rupture surfaces were dimple-like facets

indicating that the Z3CN20.09 CASS has excellent SCC resistance under this condition. SSRT samples showed significant SCC sensitivity in high-temperature water containing 100～1 500 μg/L SO_4~(2–)

and the fracture showed transgranular plus dimple mixed face. The corrosion sensitivity of different phases and phase boundaries to SO_4~(2–) and the deterioration effect of SO_4~(2–) on passive film on the alloy surface are thought to be the key factors for enhancing localized corrosion and SCC.

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