国产锻造态316L不锈钢在高温高压水环境中的应力腐蚀行为研究

doi:10.3901/JME.2018.10.053

机械工程学报 ›› 2018, Vol. 54 ›› Issue (10): 53-58.doi: 10.3901/JME.2018.10.053

国产锻造态316L不锈钢在高温高压水环境中的应力腐蚀行为研究

徐连勇^1,2, 王浩^1,2, 赵雷^1,2, 荆洪阳^1,2, 韩永典^1,2

1. 天津大学材料科学与工程学院天津 300350;
2. 天津大学天津市现代连接技术重点实验室天津 300350

收稿日期:2017-06-16 修回日期:2017-12-08 出版日期:2018-05-20 发布日期:2018-05-20
通讯作者: 韩永典(通信作者),男,1983年出生,博士,副教授。主要研究方向为焊接结构腐蚀、疲劳及断裂。E-mail:hanyongdian@tju.edu.cn
作者简介:徐连勇,男,1975年出生,教授,博士研究生导师。主要研究方向为高温结构完整性。E-mail:xulianyong@tju.edu.cn
基金资助:
国家自然科学基金资助项目（51575382）。

Study on Stress Corrosion Behavior of Domestic Forged 316L Stainless Steel in High Temperature and High Pressure Water Environment

XU Lianyong^1,2, WANG Hao^1,2, ZHAO Lei^1,2, JING Hongyang^1,2, HAN Yongdian^1,2

1. School of Materials Science and Engineering, Tianjin University, Tianjin 300350;
2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300350

Received:2017-06-16 Revised:2017-12-08 Online:2018-05-20 Published:2018-05-20

摘要/Abstract

摘要： 在模拟核电一回路的高温高压水环境中，采用慢应变速率拉伸方法，研究不同应变速率下锻造316L不锈钢的应力腐蚀行为，并通过扫描电镜对试样断口形貌进行分析。结果表明，在290℃的高温高压水环境中，随着应变速率的降低，材料的应力腐蚀敏感性逐渐增强。当应变速率为2×10^-5 s^-1时，断口未发现脆性解理特征。应变速率为2×10^-6 s^-1时，在290℃和320℃两种服役温度下，材料都具有一定应力腐蚀开裂倾向，敏感性随温度的升高也略有增强。当应变速率降为1×10^-6 s^-1时，断口边缘呈现明显的脆性解理断裂特征。使用修正的Arrhenius模型来描述锻造316L不锈钢高温高压环境下拉伸时的本构关系，计算出变形激活能Q=213.7 kJ/mol，并得到了其高温拉伸本构方程，由本构方程计算得到的抗拉强度和试验所测值的平均相对误差为0.45%，说明该本构方程能较准确计算出锻造316L不锈钢在不同高温高压条件下的抗拉强度。

关键词: 本构方程, 锻造316L不锈钢, 高温高压水, 慢应变速率, 应力腐蚀

Abstract: In high temperature and high pressure water of a simulated primary circuit of PWR environment, the stress corrosion cracking behavior of forged 316L stainless steel under different strain is investigated by means of slow strain rate testing (SSRT). And the fracture morphology of specimens is analyzed with the aid of scanning electron microscopy.The results show that the stress corrosion cracking(SCC) susceptibility of 316L stainless steel increases with the decrease of SSRT rate in the 290℃ high temperature water. At the strain rate of 2×10^-5 s^-1, no obvious cleavage character is found on the fracture surfaces. At the strain rate of 2×10^-6 s^-1, the material shows the clear tendency of brittle fracture characteristics both at the 290℃ and 320℃,while the susceptibility increases slightly with temperature. At the strain rate of 1×10^-6 s^-1, the edge fracture morphology of the specimen presents brittle fracture characteristics. The modified Arrhenius model is used to describe the high temperature and high pressure tension constitutive equation of 316 stainless steel. By calculation, the activation energy Q is about 213.7 kJ/mol, then the high temperature tensile constitutive equation is obtained. The ultimate stress values predicted by proposed model has a low value of relative error(0.45%). So this constitutive equation is some accurate to get the ultimate stress of forged 316L stainless steel in high temperature and pressure water.

Key words: constitutive equation, forged 316L stainless steel, high temperature and high pressure water, slow strain rate, stress corrosion

中图分类号:

TG172

徐连勇, 王浩, 赵雷, 荆洪阳, 韩永典. 国产锻造态316L不锈钢在高温高压水环境中的应力腐蚀行为研究[J]. 机械工程学报, 2018, 54(10): 53-58.

XU Lianyong, WANG Hao, ZHAO Lei, JING Hongyang, HAN Yongdian. Study on Stress Corrosion Behavior of Domestic Forged 316L Stainless Steel in High Temperature and High Pressure Water Environment[J]. Journal of Mechanical Engineering, 2018, 54(10): 53-58.

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国产锻造态316L不锈钢在高温高压水环境中的应力腐蚀行为研究

Study on Stress Corrosion Behavior of Domestic Forged 316L Stainless Steel in High Temperature and High Pressure Water Environment

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