摘要
为了研究纳米Y2O3对HT9钢的显微结构和力学性能的影响,采用粉末冶金工艺,制备了纳米Y2O3含量为0.1%~0.9%的ODS-HT9钢样品,测定了样品的抗拉强度、伸长率、维氏硬度等力学性能,利用透射电子显微镜(TEM)观察和分析了样品中纳米Y2O3颗粒的分布状况、形状和相结构,利用扫描电子显镜(SEM)观察了样品拉伸断口的形貌。研究表明,球磨和热压烧结后,纳米Y2O3颗粒能够均匀地分布于基体中,相结构和形状未发生明显变化。弥散分布的纳米Y2O3硬质颗粒,具有明显的弥散强化作用,导致ODS-HT9钢的抗拉强度和维氏硬度随Y2O3含量的增加而显著增加,伸长率显著降低。Y2O3含量低于0.7%时,样品以韧性断裂为主,进一步增加含量,断裂方式将由韧性断裂转变成脆性断裂。纳米Y2O3含量为0.3%~0.5%的ODS-HT9钢,抗拉强度达到了913~936 MPa,伸长率为10.7%~11.2%,具有良好的综合力学性能。本文研究结果有助于ODS-HT9钢高温性能的研究及其在反应堆中的实际应用。
By power metallurgy method,the samples of ODS-HT9 steel,which were strengthened by dispersion oxide of 0.1%~0.9%Y2O3,were prepared in order to study the effect of nano-Y2O3 on the microstructure and mechanical properties of HT9 steel.The HV,tensile strength,and elongation of the samples were measured.The distribution,the shape,and the phase structure of Nano-Y2O3 oxide particles in the sample were observed by transmission electron microscope(TEM),and the fracture microscope was by scanning electron(SEM).The results show that Y2O3 particles were homogenously distributed on the HT9 steel,and their shape and phase structure have no change after ball milling and hot-pressing.Due to the strengthened dispersion of nano-Y2O3 particles,the tensile strength and Vickers hardness of ODS-HT9 steel increase,and the elongation decreases,significantly,with the increasing of Y2O3 addition.If the addition of Y2O3 is less than 0.7%,the fracture of samples is ductile.But,if the addition of Y2O3 increases furthermore,the fracture will change to brittle.The ODS-HT9 steel samples with 0.3%~0.5%(mass fraction)of Y2O3 have a better properties.The tensile strength and elongation reach to 913~936 MPa and 10.7%~11.2%,respectively.The results will be helpful to the study of ODS-HT9 high temperature performance and its practical application in reactors.
作者
吴开霞
查五生
赵建成
唐睿
Wu Kaixia;Zha Wusheng;Zhao Jiancheng;Tang Rui(College of Intelligent Manufacturing,Jincheng College of Sichuan University,Chengdu,611731,China;College of Materials Science and Engineering,Xihua University,Chengdu,610039,China;Nuclear Power Institute of China,Chengdu,610213,China)
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2020年第2期27-31,共5页
Nuclear Power Engineering
基金
四川省科技计划项目(2014GZ0088)。
