The microstructures and tensile properties of additively manufactured Ti-base alloys were investigated. Ti-6Al-4V and Co-Cr-Mo alloy powders were blended and used for directed energy deposition of bulk samples containing 5 and 10 wt.% Co. The Ti-6Al-4V and 5 wt.% Co samples exhibited an α phase at β grain boundaries, which caused a significant reduction and anisotropy of the tensile ductility. A single-phase β microstructure exhibiting equiaxed grains with a grain size of 36 μm, random texture, and isotropic tensile properties was obtained for the as-deposited 10 wt.% Co sample. These phenomena could be ascribed to the high Co content and the resulting enhanced stability of the β phase and the constitutional supercooling of the melt-pool.

研究了增材制造的钛基合金的组织和拉伸性能。将Ti-6Al-4V和Co-Cr-Mo合金粉末混合并用于包含5wt。％和10wt。％Co的块状样品的定向能量沉积。Ti-6Al-4V和5wt。％的Co样品表现出α相在β晶界处，这引起拉伸延展性的显着降低和各向异性。对于沉积的10 wt。％Co样品，获得了具有等轴晶粒，晶粒尺寸为36μm，无规织构和各向同性拉伸性能的单相β微结构。这些现象可归因于高的Co含量以及由此导致的β相稳定性的增强和熔池的结构性过冷。