Influence of Cold-Rolling Reduction on Microstructure and Tensile Properties of Nuclear FeCrAl Alloy with Low Cr and Nb Contents  

作　　者：Hui Wang Biao Guo Xuguang An Yu Zhang 

机构地区：[1]Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu 610213,China [2]School of Materials Science and Engineering,Xihua University,Chengdu 610039,China [3]Interdisciplinary Materials Research Center,Institute for Advanced Study,Chengdu University,Chengdu 610106,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第12期2101-2110,共10页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52122103);the Sichuan Science and Technology Program(No.2022YFG0346).

摘　　要：FeCrAl alloy is one of the most promising candidates as an accident-tolerant fuel(ATF)cladding material.Herein,the influence of cold-rolling(CR)reduction on microstructure and tensile properties of the as-annealed FeCrAl alloys,with low Cr and Nb contents,is systematically examined.With the increase in CR reduction,the grain size of FeCrAl alloy is obviously refined after annealing because the increase in stored deformation energy leads to enhanced recrystallization.However,the large CR reductions result in a severe mixed-grain microstructure,significantly reducing the uniform deformability of the FeCrAl alloy.The dislocation density of the as-annealed FeCrAl alloy decreases with the increase in CR reduction,except for the excessive CR reduction of 50%.Moreover,the Laves phases are crushed and dissolved during CR and annealing,as well as large amounts of refined Laves phases are found after large CR reductions.The pinning effect of the Laves phases can significantly improve the strength of FeCrAl alloy.Accordingly,the strengthening mechanisms of FeCrAl alloy consist of fine-grain strengthening,dislocation strengthening and precipitation strengthening.Finally,the FeCrAl alloy,with a CR reduction of 30%,achieves optimal tensile properties.This study can provide theoretical guidance for the industrial production of the FeCrAl alloy.

关 键 词：FeCrAl alloy Cold-rolling reduction Tensile properties Microstructure evolution Strengthening mechanism 

分 类 号：TG335.12[金属学及工艺—金属压力加工] TL34[核科学技术—核技术及应用]