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《Acta Metallurgica Sinica》 2012-06
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PREPARATION AND CHARACTERIZATION OF NANOSTRUCTURED 14Cr-ODS FERRITIC STEEL

Lü Zheng,LU Chenyang,ZHANG Shouhui,XIE Rui,Liu Chunming Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang 110819  
Nano-structured oxide dispersion strengthened(ODS) ferritic steels are the leading candidates of fuel cladding for future fast neutron feeder reactors due to their excellent radiation tolerance and high-temperature creep strength.A 14Cr-ODS steel was prepared by mechanical alloy(MA) and hot isostatic pressing(HIP) methods.The morphology and microstructure of MA powders and the microstructure of 14Cr-ODS steel were characterized by SEM,XRD,EDS and TEM.The results showed that during the MA,the size of powders increases with the increasing milling time(0-2 h),then decreases with the increasing milling time(2-70 h).The grain size decreases with the increasing milling time.The alloying elements and Y_2O_3 dissolve fully into Fe matrix during MA after 70 h.Three kinds of precipitates are observed in the consolidated 14Cr-ODS steel:very high number density of nanoscale Y-Ti-O-rich clusters,few pyrochlore structure Y_2Ti_2 O_7 particles and some Cr-Ti-rich particles.The clusters exhibits good high temperature stability at 1250℃for 8 h,while the density of Y_2Ti_2O_7 precipitates increases.
【Fund】: 国家自然科学基金项目50971033和91026013;; 国家重点基础研究发展计划项目2011CB610405;; 教育部新世纪优秀人才支持计划项目NCET-10-0302;; 中央高校基本业务费N100402001;; 沈阳市科学技术计划项目F10-205-1-52资助~~
【CateGory Index】: TB383.1;TG142.23
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