西北工程技术学报2025，Vol.24Issue(1)：8-14,7.
耐事故燃料包壳用FeCrAl合金的高温蠕变行为及变形机制
High-temperature Creep Behavior and Deformation Mechanism of FeCrAl Alloy for Accident Tolerant Fuel Cladding
摘要
Abstract
As a high temperature corrosion-resistant alloy,FeCrAl is an important candidate for accident tolerant fuel cladding in nuclear reactors.The high-temperature creep properties of FeCrAl alloy and its microstructural changes before and after creep were investigated using creep tests and scanning electron microscopy(SEM).The dominant deformation mechanisms were explored.The results show that when the temperature and stress are low,large grains during the creep process engulf smaller grains,and the fraction of low-angle grain boundaries(GBs)decreases after creep.However,at high temperatures and high stresses,dislocation within the grains proliferate rapidly,and the number of low-angle GBs increases obviously.As the stress increases,the creep mechanism transitions from GB slip to dislocation motion within the present research scope.As temperature rises or grain size decreases,the critical stress for dislocation motion decreases,and the dislocation density increases considerably,leading to a gradual decrease in the high-temperature creep resistance of the alloy.Temperature,stress,and grain size play major roles in the creep process,with no significant changes in microstructure before and after creep.Under high stress conditions,the creep mechanism is dominated by dislocation motion.The higher temperature or the smaller the grain size,the smaller stress at which dislocations begin to move.关键词
核燃料包壳/FeCrAl合金/微观组织/蠕变机制Key words
nuclear fuel cladding/FeCrAl alloy/microstructure/creep mechanism分类
核科学引用本文复制引用
崔健,白文秀,姚欢,武俊梅,巫英伟,陈平..耐事故燃料包壳用FeCrAl合金的高温蠕变行为及变形机制[J].西北工程技术学报,2025,24(1):8-14,7.基金项目
国家重点研发计划项目(2019YFB1901003) （2019YFB1901003）
