摘要
采用粉末冶金工艺制备了含Ti氧化物弥散强化钢。使用电子背散射衍射方式研究了这种钢的晶粒形貌,使用透射电镜和高分辨率透射电镜表征了钢中析出相的形貌及种类,使用以同步辐射装置作为光源的小角度X射线散射技术和X射线吸收精细结构技术研究了钢中纳米尺寸析出相的分布特征和氧化物弥散强化钢中Y元素的存在形式,并测量了钢的力学性能。结果表明,含Ti氧化物弥散强化钢的晶粒多呈等轴状、平均晶粒尺寸为1.24μm。钢中富Y、Ti、O纳米尺寸析出相的分布密度为1.39×10^(24)/m^(3),平均直径为2.23 nm。向材料中添加Ti元素改变了材料中Y原子的存在形式,生成了具有烧绿石结构的Y_(2)Ti_(2)O_(7)相和少量的富Cr、Mn相。这种钢的室温抗拉强度达到1324 MPa,随着测试温度的提高抗拉强度逐渐降低,延伸率逐渐提高。
An oxide dispersion strengthened(ODS)steel containing Ti was prepared by powder met-allurgy.The grain morphology of the ODS steel was investigated by electron backscatter diffraction(EBSD).The morphology and types of precipitates in the ODS steel were characterized by transmission electron microscope(TEM)and high-resolution transmission electron microscope(HRTEM).The nano size precipitates of the ODS steel was investigated by small angle X-ray scattering(SAXS)technique and X-ray absorption fine structure(XAFS)technique using synchrotron radiation device.And the existence form of Y element in the ODS steel was examined by using XAFS technique.At the same time,the me-chanical properties of the ODS steel were measured.The results show that the grains of the ODS steel are equiaxed,and the average grain size is 1.24×10^(-6)m.The spatial density of the nano-sized precipi-tates rich in O,Ti and Y of the steel is 1.39×10^(-24)/m^(3),while the formed Y_(2)Ti_(2)O_(7)phase presents pyrochlore structure and a small amount of a phase rich in Cr and Mn was observed too.The tensile strength of the ODS steel reaches 1324 MPa at room temperature.With the increase of test temperature,the tensile strength of the material decreases,whereas the elongation increases gradually for the ODS steel.
作者
谢锐
吕铮
徐长伟
王晴
刘春明
XIE Rui;LV Zheng;XU Changwei;WANG Qing;LIU Chunming(School of Materials Science and Technology,Shenyang Jianzhu University,Shenyang 110168,China;School of Materials Science and Engineering,Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2022年第2期99-106,共8页
Chinese Journal of Materials Research
基金
国家自然科学基金青年基金(51601031)
兴辽英才计划(XLYC1902103)。
关键词
金属材料
微观组织
同步辐射
氧化物弥散强化钢
X射线吸收精细结构
小角度X射线散射
metallic materials
microstructure
synchrotron radiation
oxide dispersion strengthened steel
X-ray absorption fine structure
small-angle x-ray scattering
