内蒙古电力技术2025，Vol.43Issue(3)：1-8,8.DOI:10.19929/j.cnki.nmgdljs.2025.0028
核燃料包壳用FeCrAl合金的高温蠕变特性及本构参数研究
Research on High-Temperature Creep Properties and Constitutive Parameters of FeCrAl Alloy for Nuclear Fuel Cladding
摘要
Abstract
In this paper,the high temperature creep properties and constitutive relationship of FeCrAl alloys are researched using molecular dynamics(MD)method.The effects of temperature,stress and grain size(GS)on the steady-state creep rate are analyzed,and the creep constitutive parameters of creep activation energy Qc,stress exponent n,and grain exponent p are fitted.The results show that the effects of stress and temperature on the creep constitutive parameters are more significant than GS and alloy composition.As the stress increases,the change in n becomes particularly significant.Under low stress,n ranges from 1.2 to 1.5,and then it increases greatly from 2.0 to more than 4.0 under medium and high stress conditions.When the temperature is lower than 1000 K,the values of Qc are rarely affected by stress,which is found to be about 0.1 eV to 0.2 eV at different stresses.However,under higher temperatures,Qc increases from 0.5 eV to 1.0 eV as stress rises.When the GS is less than 12 nm,p increases roughly from 1.5 to 3.5 with the increasing stress and temperature.When GS exceeds 12 nm,p is approximately 0.7 to 1.0.关键词
核燃料包壳/FeCrAl合金/高温/蠕变特性/本构参数Key words
nuclear fuel cladding/FeCrAl alloy/high temperature/creep properties/constitutive parameters分类
能源科技引用本文复制引用
崔健,白文秀,姚欢,武俊梅,巫英伟,陈平..核燃料包壳用FeCrAl合金的高温蠕变特性及本构参数研究[J].内蒙古电力技术,2025,43(3):1-8,8.基金项目
国家重点研发计划项目"先进核燃料元件设计研究及材料研制"(2019YFB1901003) （2019YFB1901003）
