14Cr-ODS钢的显微组织和拉伸性能及热稳定性  

Microstructure, tensile properties and thermal stability of 14Cr-ODS steel

作　　者：陈灵芝 李少夫 廖璐[1] 董浩[3,4] 车洪艳 周张健[1] 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)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [3]中国钢研科技集团有限公司安泰科技股份有限公司,北京100081 [4]河北省热等静压工程技术研究中心,河北涿州072750

出　　处：《材料热处理学报》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)

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.

关 键 词：ODS钢 氧化物粒子 弥散强化 显微组织 时效处理 

分 类 号：TG142.3[一般工业技术—材料科学与工程]