高氧含量Ti-15Mo合金的组织性能研究

Microstructure and Properties of Ti-15Mo Alloy with High Oxygen Content

摘要:

本文针对氧含量较高的Ti-15Mo合金,研究了该合金的铸态组织以及通过不同温度固溶处理得到的组织和对应的性能。成分分析表明,该合金溶入了0.8wt%的O,以下称为Ti-15Mo-0.8O合金。利用光学显微镜(OM)、扫描电子显微镜(SEM)和X射线衍射仪(XRD)观察分析了Ti-15Mo-0.8O合金的组织转变。结果表明：合金的铸态组织由α和β两相组成；经过900℃、1000℃、1100℃/2h固溶处理后,合金的相组成转变过程为α+β+TO→β+ TO→β；随着固溶温度的上升,合金β相的晶格常数逐渐增加。利用维氏硬度计和万能试验机进行硬度和室温压缩测试。结果表明：1100℃/2h固溶处理后的试样获得最高硬度,其值为455HV20；1100℃/2h固溶处理后的试样具有最好的压缩性能,压缩屈服强度为和抗压强度分别为1617Mpa和2308Mpa,压缩率为22%。

Abstract:

In this paper, the as-cast microstructure of Ti-15Mo alloy with high oxygen content and the microstructure and corresponding properties obtained by solution treatment at different temperatures are studied. Composition analysis shows that 0.8wt% O is dissolved in the alloy, hereinafter referred to as Ti-15Mo-0.8O alloy. The microstructure transformation of Ti-15Mo-0.8O alloy was observed and analyzed by optical microscope (OM), scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the as-cast structure of the alloy consists of α and β phases. After solid solution treatment at 900℃, 1000℃, 1100℃/2h, the phase composition transformation process of the alloy is α+β+TOβ+TOβ; The lattice constant of β phase of alloy gradually increases with the increase of solid solution temperature. Hardness and room temperature compression tests were carried out by Vickers hardness tester and universal testing machine. The results show that the highest hardness of the sample after solution treatment at 1100℃/2h is 455HV20；The sample after solution treatment at 1100℃/2h has the best compression performance, with compressive yield strength of 1617Mpa and compressive strength of 2308Mpa respectively, and compression ratio of 22%.