用于乏核燃料后处理的商用Zr702在沸腾硝酸溶液中的应力腐蚀开裂行为  

Stress Corrosion Cracking Behavior of Commercial Zr702 in Boiling Nitric Acid Solutions for Spent Nuclear Fuel Reprocessing

作　　者：齐博毅 刘承泽 杨庆浩[1] 徐建平 刘璐 邱龙时 张于胜 Qi Boyi;Liu Chengze;Yang Qinghao;Xu Jianping;Liu Lu;Qiu Longshi;Zhang Yusheng(School of Materials Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;Xi'an Rare Metal Materials Institute Co.,Ltd,Xi'an 710016,China;State Key Laboratory for Mechanical Behavior of Materials,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710054 [2]西安稀有金属材料研究院有限公司,陕西西安710016 [3]西安交通大学金属材料强度国家重点实验室,陕西西安710049

出　　处：《稀有金属材料与工程》2022年第12期4483-4487,共5页Rare Metal Materials and Engineering

基　　金：Natural Science Foundation of Shaanxi Province(2020JC-50,2020JQ-924,2020GY-268);Xi’an Science and Technology Plan Project(2020YZ0028);RMMI Research Project(Y1905S)。

摘　　要：研究了商用Zr702在沸腾硝酸中应用于乏核燃料后处理工业的应力腐蚀开裂(SCC)行为和应力腐蚀敏感性(I_(SCC))。使用独立设计的慢应变率拉伸(SSRT)系统在沸腾的硝酸中获得应变率为10^(-5)s^(-1)的Zr702的应力-应变曲线。进行微观表征以及数值分析以量化Zr702的SCC行为。结果表明,随着HNO_(3)浓度的增加,Zr702的I_(SCC)由5%明显增加到26.67%。商用Zr702在沸腾HNO_(3)溶液中力学性能的急剧下降归因于试样表面的解理断裂,并且解理裂纹的深度随着HNO_(3)浓度的增加而增加。最后,提出了预测商业Zr702在沸腾HNO_(3)溶液中SCC行为的模型和方程。HNO_(3)浓度、I_(SCC)、断裂应力(σ_(SCC))和解理裂纹深度(d_(cc))之间的定量关系可以使用高阶回归方程来描述和预测。The stress corrosion cracking(SCC) and its susceptibility(I_(SCC)) of commercial Zr702 applied for spent nuclear fuel reprocessing industry was investigated in boiling nitric acid. Stress-strain curves of Zr702 in boiling nitric acid with strain rate of 10^(-5)s^(-1) were obtained using independent designed slow strain rate tension(SSRT) system. Microscopic characterizations as well as numerical analysis were carried out to quantify the SCC behavior of Zr702. Results reveal that the I_(SCC)of Zr702 obviously increases from 5% to 26.67% with the increase in HNO_(3)concentration. The sharp decline in the mechanical properties of commercial Zr702 in boiling HNO_(3)solutions is attributed to cleavage fracture on surfaces of specimen, and the depth of the cleavage cracks increases with the growing HNO_(3)concentration. Finally, a model and an equation to predict the SCC behavior of commercial Zr702 in boiling HNO_(3)solutions was proposed. The quantitative relationship among HNO_(3)concentration, I_(SCC), fracture stress(σ_(SCC)) and cleavage crack depth(d_(cc)) can be described and predicted using a high-order regression equation.

关 键 词：再加工 Zr702 应力腐蚀开裂 慢应变速率拉伸 

分 类 号：TL24[核科学技术—核燃料循环与材料] TG172[金属学及工艺—金属表面处理]