核级316LN不锈钢弯管在高温高压水中的应力腐蚀裂纹扩展行为

doi:10.11902/1005.4537.2017.006

中国腐蚀与防护学报

2018, Vol. 38

Issue (1): 54-61 DOI: 10.11902/1005.4537.2017.006

本期目录 | 过刊浏览

核级316LN不锈钢弯管在高温高压水中的应力腐蚀裂纹扩展行为

朱若林^1,², 张利涛¹, 王俭秋¹(

), 张志明¹, 韩恩厚¹

1 中国科学院金属研究所中国科学院核用材料与安全评价重点实验室沈阳 110016
2 中核武汉核电运行技术股份有限公司武汉 430223

Stress Corrosion Crack Propagation Behavior of Elbow Pipe of Nuclear Grade 316LN Stainless Steel in High Temperature High Pressure Water

Ruolin ZHU^1,², Litao ZHANG¹, Jianqiu WANG¹(

), Zhiming ZHANG¹, En-Hou HAN¹

1 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 China Nuclear Power Operation Technology Corporation, LTD, Wuhan 430223, China

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摘要:

采用直流电位降 (DCPD) 技术,实现了在模拟核电一回路高温高压水环境中对核级316LN不锈钢 (SS) 弯管材料应力腐蚀裂纹扩展的实时监测,同时利用扫描电子显微镜 (SEM) 和电子背散射衍射 (EBSD) 技术对试样断口及裂纹扩展路径进行观察。结果表明,在270~330 ℃范围,316LN SS弯管材料在高温高压水环境中的应力腐蚀裂纹扩展速率随着温度的升高而单调增加,其裂纹扩展的表观激活能 (E_aae) 为52 kJ/mol。硼锂溶液对裂纹扩展速率有一定的影响,其影响程度和溶液在特定温度下的pH值有关。应力腐蚀断口呈现典型的沿晶开裂形貌,且裂纹沿着大角度晶界扩展。

关键词 ：奥氏体SS, 高温高压水, 应力腐蚀, 裂纹扩展速率

Abstract：

The stress corrosion crack propagation behavior of the elbow pipe of nuclear grade 316LN stainless steel (SS) in high temperature high pressure water was studied by means of direct current potential drop (DCPD) method coupled with in-situ measuring the crack length of the compact tension (CT) specimen, as well as scanning electron microscope (SEM) and electron back scattering diffraction (EBSD) technique. Results indicated that the crack growth rate monotonically increased with the increase of temperature ranging from 270 ℃ to 330 ℃, and the crack growth rate at 330 ℃ was 1.7 fold of that at 270 ℃. The apparent activation energy (E_aae) for stress corrosion crack propagation of 316LN SS was 52 kJ/mol. The crack growth rate of 316LN SS was affected by the solution with dissolved 1500 mg/L B+2.3 mg/L Li in high temperature high pressure water and the influence extent depended on the pH of the solution. The results of the crack growth rates could provide data support for the plant safety evaluation and remnant life prediction. Intergranular stress corrosion cracking was observed for the fractured surface of 316LN stainless steel tested in pressurized high temperature water. The crack propagated along with the large angle grain boundaries instead of the coincidence site lattice (CSL) boundaries and lots of secondary cracks were observed. Moreover, the residual strain at the grain boundary was larger than that of the interior of grains.

Key words： austenite stainless steel high temperature high pressure water stress corrosion cracking crack growth rate

收稿日期: 2017-01-09

ZTFLH:

TG172

基金资助:国家重点研发计划 (2017YFB0702100),国家自然科学基金 (51771211),中国科学院前沿科学重点研究项目(QYZDY-SSW-JSC012) 和中国科学院重点部署项目 (ZDRW-CN-2017-1)

作者简介: 作者简介朱若林,男,1990年生,博士生

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引用本文:

朱若林, 张利涛, 王俭秋, 张志明, 韩恩厚. 核级316LN不锈钢弯管在高温高压水中的应力腐蚀裂纹扩展行为[J]. 中国腐蚀与防护学报, 2018, 38(1): 54-61.
Ruolin ZHU, Litao ZHANG, Jianqiu WANG, Zhiming ZHANG, En-Hou HAN. Stress Corrosion Crack Propagation Behavior of Elbow Pipe of Nuclear Grade 316LN Stainless Steel in High Temperature High Pressure Water. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 54-61.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.006 或 https://www.jcscp.org/CN/Y2018/V38/I1/54

图1 316LN SS弯管和紧凑拉伸试样取样示意图

图2 1/2T CT试样尺寸示意图

表1 316LN SS在高温高压水中 (270~330 ℃) 的应力腐蚀实验条件和裂纹扩展速率

图3 316LN SS在高温高压水 (310 ℃) 中腐蚀疲劳裂纹长度随时间变化曲线

图4 316LN SS在高温高压水 (270~310 ℃) 中应力腐蚀裂纹长度随时间变化曲线

图5 300 ℃下Ni在铁-铬-镍三元体系中的Pourbaix图[20]

图6 溶液温度 (270~310 ℃) 对316LN SS应力腐蚀裂纹扩展速率的影响

图7 316LN SS经过高温高压水 (270~310 ℃) 应力腐蚀实验之后样品断口的宏观形貌

图8 316LN SS经过高温高压水 (270~310 ℃) 应力腐蚀实验之后样品断口的SEM像

图9 316LN SS经过高温高压水 (270~310 ℃) 应力腐蚀实验之后样品裂纹扩展路径的SEM观测

图10 316LN SS经过高温高压水 (270~310 ℃) 应力腐蚀实验之后裂纹扩展路径的EBSD观测

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