Zr-1.35Sn-0.22Fe-0.13Cr-0.05Ni合金热处理工艺优化及其高温高压水腐蚀行为研究  

Optimization of Heat Treatment Process and Corrosion Performance in High-temperature and High-pressure of Zr-1.35Sn-0.22Fe-0.13Cr-0.05Ni Alloy

作　　者：雷艾嘉 戴训[2] 许江涛 邓睿驹 黄雪飞[1] LEI Aijia;DAI Xun;XU Jiangtao;DENG Ruiju;HUANG Xuefei(College of Materials Science and Engineering,Sichuan university,Chengdu 610065,China;Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]四川大学材料科学与工程学院,成都610065 [2]中国核动力研究设计院反应堆燃料及材料重点实验室,成都610213

出　　处：《中国腐蚀与防护学报》2025年第2期497-505,共9页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2023YFB3710705);高端装备先进材料与制造重点实验室开放课题(2023KFKT0009)。

摘　　要：研究了不同热处理工艺处理后得到的Zr-1.35Sn-0.22Fe-0.13Cr-0.05Ni合金在360℃、18.6 MPa去离子水环境中的均匀腐蚀行为。实验结果表明,Zr-1.35Sn-0.22Fe-0.13Cr-0.05Ni合金的腐蚀动力学曲线在转折点前表现出典型的类抛物线规律,其腐蚀动力学初次转折时间相较Zircaloy-4合金(Zr-1.50Sn-0.20Fe-0.1Cr)显著推迟,意味着降低Sn元素可以提升锆合金的抗高温高压水腐蚀性能。提高Zr-1.35Sn-0.22Fe-0.13Cr-0.05Ni合金的中间退火温度或延长α相的保温时间可以增加第二相的平均粒径,同时可以使Zr(Fe,Cr)_(2)中的Fe/Cr原子比率更接近1,有利于延长腐蚀动力学初次转折时间。The Zr-Sn-Fe-Cr-Ni alloy,due to its insensitivity to dissolved oxygen in high-temperature water corrosion environment,is suitable for reactors with high dissolved oxygen content such as Small Modular Reactors and Advanced Boiling Water Reactors.To develop high-performance Zr-Sn-Fe-Cr-Ni alloys,the Sn content was reduced,and the content of Fe,Cr,and Ni was appropriately increased based on the Zircaloys.Then the influence of heat treatments on the microstructural variations of the new Zr-1.35Sn-0.22Fe-0.13Cr-0.05Ni alloy was characterized.Meanwhile,the corrosion behavior of the Zr-1.35Sn-0.22Fe-0.13Cr-0.05Ni alloys,being subjected to two different heat treatments,was studied in high-temperature and high-pressure water at 360℃/18.6 MPa for 330 d by taking Zircaloy-4 as comparison.Results show that the two different heat treated Zr-1.35Sn-0.22Fe-0.13Cr-0.05Ni alloys exhibited more or less the same corrosion behavior with typical approximate parabolic kinetics in the initial corrosion stage.After 220 d and 250 d of exposure,corrosion transitions occurred respectively.Compared to Zircaloy-4,the corrosion transition time was significantly delayed.This suggests that reducing the Sn content is advantageous in delaying the time for the occurrence of the corrosion transition during the initial corrosion period,which may be conductive to the improvement of long-term corrosion resistance of the Zr-Sn-Fe-Cr-Ni alloys.This may be ascribed to that by increasing the intermediate annealing temperature or extending the holding time byα-phase region for Zr-1.35Sn-0.22Fe-0.13Cr-0.05Ni alloy may be facilitate the increase of the average size of second phase particles,thus make the atomic ratio Fe/Cr closer to 1,which may be conductive to effectively delay the occurrence of the first corrosion transition of the Zr-Sn-Fe-Cr-Ni alloys during the initial corrosion period.

关 键 词：锆合金 腐蚀 第二相 累积退火参数 

分 类 号：TG172.82[金属学及工艺—金属表面处理]