热等静压温度对14Cr-ODS钢显微组织及力学性能的影响  

Effect of Hot Isostatic Pressing Temperature on Microstructure and Mechanical Properties of 14Cr-ODS Steel

作　　者：谢锐 吕铮 卢晨阳 王晴[1] 徐世海 刘春明 XIE Rui;LYU Zheng;LU Chenyang;WANG Qing;XU Shihai;LIU Chunming(School of Material Science and Technology,Shenyang Jianzhu University,Shenyang 110168,China;School of Material Science and Engineering,Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China)

机构地区：[1]沈阳建筑大学材料科学与工程学院,沈阳110168 [2]东北大学材料科学与工程学院,材料各向异性与织构教育部重点实验室,沈阳110819

出　　处：《材料导报》2020年第8期141-148,共8页Materials Reports

基　　金：自然科学基金青年基金(51601031)。

摘　　要：本实验首先利用激光粒度仪、X射线衍射仪(XRD)、扫描电镜(SEM)、能谱仪(EDS)等研究了氧化物弥散强化(Oxides dispersion streng-thened,ODS)钢过饱和固溶体合金粉的球磨工艺,再利用电子背散射衍射(EBSD)、透射电镜(TEM)、高角环形暗场像(HAADF)、小角度X射线散射(SAXS)等实验方法研究热等静压(HIP)温度对14Cr-ODS钢微观结构和力学性能的影响。实验结果表明,合金粉经过50 h球磨后符合制备ODS钢的各项要求。900℃和1200℃下热等静压成型的14Cr-ODS钢的晶粒尺寸分别为0.4μm、1.2μm。两种温度下热等静压成型的14Cr-ODS钢中均含有富Y-Ti-O纳米团簇、Y 2Ti 2O 7及大尺寸的富Cr-Ti-O相。900℃下HIP成型14Cr-ODS钢样品中富Y-Ti-O纳米团簇的分布密度为4.96×10^24个/m^3。随着热等静压温度的升高,富Y-Ti-O纳米团簇尺寸长大、分布密度降低。900℃下热等静压成型的样品的维氏硬度略高,抗拉强度更强。The milling technology of oxides dispersion strengthened steels alloy powders were studied firstly by laser particle size analyzer,X-ray diffraction(XRD),scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and so on.The electron backscattered diffraction,transmission electron microscope,high-angle annular dark field image,and small-angle X-ray scattering were applied to study the effect of hot isostatic pressing temperatures on the microstructure and mechanical properties of 14Cr-ODS steels.The experiment data show that the alloy powder can meet the requirements of preparing ODS steels after 50 h ball milling.The grain sizes of 14Cr-ODS steels hot isostatic pressing at 900℃and 1200℃are 0.4μm and 1.2μm,respectively.Y-Ti-O-rich nanoclusters,Y 2Ti 2O 7 and large-sized Cr-Ti-O-rich phases are found in 14Cr-ODS steels hot isostatic pressing at 900℃and 1200℃.The distribution density of Y-Ti-O-rich nanoclusters in 14Cr-ODS steels hot isostatic pressing at 900℃is 4.96×10^24/m^3.As the hot isostatic pressing temperature rising,the size of Y-Ti-O-rich nanoclusters growing while distribution density decreasing.The Vickers hardness of 14Cr-ODS steels HIP at 900℃is slightly higher,and the tensile strength is higher at test temperatures.

关 键 词：氧化物弥散强化 合金粉球磨 热等静压温度 显微组织 富Y-Ti-O纳米团簇 

分 类 号：TB31[一般工业技术—材料科学与工程]