Microstructure and Tensile Property of Hybrid Fabricated Ti-6Al-4V Alloy by Investment Casting and Laser Additive Manufacturing

Hybrid manufacturing of titanium alloys by investment casting and laser additive (LAM) combines the advantages both techniques can further reduce cost. In this study, microstructure evolution in bonding zone tensile property hybrid Ti-6Al-4V alloy are carefully investigated. Results show that sample consists LAM zone, heat-affected (HAZ) base zone. A transition (TZ) forms within HAZ close to fusion line. Grains bottom much finer with a mixture equiaxed grain small columnar grain, gradually coarsening fully large grains. Typical ultra-fine basket-wave TZ, changes from fine coarsened bimodal microstructure. The highest microhardness is 491 HV. fracture occurs half, strength reaches (821 ± 31) MPa, which higher than pure ((778 22) MPa). However, elongation ((8.0 0.5)%) lower ((10.0 1.7)%).