热等静压钒的组织和性能研究

Study of microstructure and properties of vanadium manufactured by hot isostatic pressing

纯钒粉末通过预清洗、冷等静压(CIP)成形、热等静压(HIP)的工艺制备成纯钒块材,采用拉伸实验、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线结构衍射仪(XRD)等技术对其力学性能和微观组织结构进行了研究。结果表明:在1 200℃条件下,纯钒的强度、伸长率和密度随热等静压压力升高而增加,随热等静压保温时间延长而下降;在1 200℃/120MPa/1h工艺条件下制备的纯钒试样相对密度达99.7%,抗拉强度和伸长率分别达552MPa和20%。纯钒的晶粒结合紧密,呈单相,为板条状马氏体结构,其断裂方式以解理断裂为主。

Using pure vanadium powder,pure vanadium bulk material were prepared by means of pre-cleaning,cold isostatic pressing（CIP）,hot isostatic pressing（HIP）.Mechanical properties and the microstructure of pure vanadium were investigated on the basis of tensile test,X-ray diffractions spectrometer（XRD）,scanning electron microscope（SEM） and transmission electron microscope（TEM）.The results show that the ultimate strength,the elongation and the relative density are increased with the increase of the HIP pressure and decreased with the increase of HIP holding time when HIP temperature is 1 200℃.The relative density,the elongation and the ultimate strength are 99.7%,20% and 552MPa under the HIP condition of 1 200℃,120MPa and 1h,respectively.The results also reveal that pure vanadium has well-knit grains,single-phase and band martensite microstructure.Moreover the fracture of the tensile specimen show cleavage fracture in most case.