摘要
采用机械合金化结合热等静压法制备了14Cr-ODS钢,并在700℃进行最长至5000 h的时效处理。利用扫描电镜(SEM)和透射电镜(TEM)对其显微组织,尤其是时效前后纳米氧化物弥散粒子的特征进行了研究。结果表明:粉末冶金法制备的14Cr-ODS钢具有亚微米细晶组织,晶内弥散分布具有很高数密度的平均尺寸小于10 nm的超细Y2Ti2O7粒子,这种独特的显微组织使得14Cr-ODS钢具有较为优良的拉伸性能;在700℃长期时效后,14Cr-ODS钢的弥散粒子的尺寸、形貌和成分保持稳定,其显微硬度由于应力消除而明显降低,但是拉伸性能没有发生明显变化。
14 Cr oxide dispersion strengthened(ODS) ferritic steel(14 Cr-ODS) was prepared by mechanical alloying and hot isostatic pressing, and the aging treatment of the steel was carried out at 700 ℃ for up to 5000 h. The microstructure and the characteristics of nano-oxide dispersed particles before and after aging of the steel were studied by means of scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results show that the 14 Cr-ODS steel prepared by the mechanical alloying and hot isostatic pressing method has a sub-micron fine grain structure, and a very high density of ultra-fine Y2Ti2O7 particles with an average size of less than 10 nm are distributed in the grain, and the unique microstructure enables the 14 Cr-ODS steel to have excellent tensile properties. After a long-term aging at 700 ℃, the size, shape and composition of the dispersed oxide particles of the 14 Cr-ODS steel are stable, and the microhardness is obviously reduced due to the stress relief, but the tensile properties do not change significantly.
作者
陈灵芝
李少夫
廖璐
董浩
车洪艳
周张健
CHEN Ling-zhi;LI Shao-fu;LIAO Lu;DONG Hao;CHE Hong-yan;ZHOU Zhang-jian(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Science,Beijing 100190,China;Advanced Technology and Materials Limited Company,China Iron and Steel Research Institute Group,Beijing 100081,China;Engineering and Technology Research Center of Hot Isostatic Pressing,Zhuozhou 072750,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第11期124-129,共6页
Transactions of Materials and Heat Treatment
基金
科技部国际热核聚变实验堆计划专项(2015GB121006)
国家自然科学基金(51801202)
