FeCrAl合金中高温水蒸气氧化增重模型研究  

Study on Weight-gain Model of FeCrAl Alloy by Steam Oxidation at Medium and High Temperature

作　　者：刘臻 张晓红[1] 乔英杰[1] 何琨[2] 杜沛南 张瑞谦[2] 都时禹 Liu Zhen;Zhang Xiaohong;Qiao Yingjie;He Kun;Du Peinan;Zhang Ruiqian;Du Shiyu(College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin,150001,China;Nuclear Power Institute of China,Chengdu,610213,China;School of Materials Science and Engineering,China University of Petroleum,Qingdao,Shandong,266580,China)

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001 [2]中国核动力研究设计院,成都610213 [3]中国石油大学(华东)材料科学与工程学院,山东青岛266580

出　　处：《核动力工程》2024年第3期139-145,共7页Nuclear Power Engineering

基　　金：国家重点研发计划(2019YFB1901003)。

摘　　要：通过预测FeCrAl合金在不同温度下的水蒸气氧化行为,从而为反应堆失水事故(LOCA)下的FeCrAl包壳性能演化仿真提供模型。本文基于反应控制与扩散控制的氧化机制,提出了两段式的氧化增重微分模型,并给出了模型参数标定方法。结合实验提供的FeCrAl合金在高温(900~1200℃)与中温(400℃)条件下的水蒸气氧化增重数据,模型能够统一描述400~1200℃温度区间内的FeCrAl合金氧化增重行为,与实验数据的误差控制在20%以内。同时观测到,反应-扩散机制的临界增重在400~900℃时基本不变,在更高温度时显著上升,其原因是高温时氧化层生长过快,难以形成致密的氧化保护层。考虑实际LOCA时初始水腐蚀氧化层的影响以及气压变化,模型给出了相对应的修正方案。本研究有望为FeCrAl合金包壳在LOCA下的失效行为仿真提供氧化增重模型与数据。In order to predict the steam oxidation behavior of FeCrAl alloy at different temperatures and provide the model for the evolution simulation of the performance of FeCrAl cladding under loss of coolant accident(LOCA),a two-stage differential oxidation weight-gain model was proposed based on the reaction and diffusion control mechanisms,and a parameter calibration method was also presented.Combined with the experimental data from FeCrAl steam oxidation tests at high temperature(900-1200℃)and medium temperature(400℃),the model can uniformly describe the weight-gain behavior of FeCrAl alloy in the temperature range of 400-1200℃,and the error with experimental data is controlled within 20%.At the same time,it is observed that the critical weight-gain of the reaction-diffusion mechanism is basically unchanged at 400-900℃,but increases significantly at higher temperature,because the oxidation layer grows too fast to form the dense oxidation protective layer.In addition,considering the influence of initial oxide layer from water corrosion and the change of steam pressure during LOCA,a modified scheme of the oxidation-weight gain model is given.This study is expected to provide oxidation model and parameters for the failure behavior simulation of the FeCrAl alloy cladding under LOCA accidents.

关 键 词：FeCrAl合金 耐事故燃料(ATF) 氧化增重 高温水蒸气氧化 失水事故(LOCA) 

分 类 号：TL341[核科学技术—核技术及应用]