Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Samples Fabricated by Selective Laser Melting

Abstract

Ti-6Al-4V (wt%) alloy samples with dog-bone and box shapes respectively were fabricated by selective laser melting (SLM). The microstructures and mechanical properties of the 3D printed Ti-6Al-4V samples with and without heat treatment were characterized and tested. The microstructures of the as-fabricated dog-bone shaped samples were mainly composed of acicular α’ phase. After annealing at 700°C, the acicular α’ phase changed into an α/β lamellar structure. After solution treatment at 955°C, water quenching and aging at 550°C, the microstructure was mainly composed of primary α phase and α/β lamellar structure. The optimum heat treatment is annealing, and the mechanical properties of the annealed sample are as follows: yield strength: 1015 MPa, ultimate tensile strength (UTS): 1083 MPa and elongation to fracture: 7.9%. The microstructures of the box-shaped samples after annealing mainly consist of α phase and α/β lamellar structure. When stretched along the direction parallel to the crystal growth direction, the yield strength and UTS of the sample are 1054 and 1090 MPa，and its elongation to fracture is 6.3%. When stretched along the direction perpendicular to the crystal growth direction, the yield strength and UTS of the sample are 1019 and 1068 MPa respectively, and its elongation to fracture is 8.7%.

Combinatorial Effects of the Recipes of the Initial Gas-atomized Powder Sizes on Microstructure and Passivation Characteristics of the SLM-ed Ti-6Al-4V Bulk Alloys

“…13. On the other hand, the content of the α/α' phases affects the corrosion performances [2,5,51,52]. The corrosion resistance of SLM-ed Ti-6Al-4V alloys become better as the volume fraction of α phases increase.…”

Response surface methodology based parametric study for AISI H13 die steel using customized designed 3D printed Ti64 multi-nozzle polishing tool

“…In the present work, selective laser melting (SLM) process is used for fabrication of the FJP nozzle tool from Titanium alloy Ti6Al4V (also known as Ti64) which possesses good properties such as high strength, corrosion resistant, etc. 23…”

“…In the present work, selective laser melting (SLM) process is used for fabrication of the FJP nozzle tool from Titanium alloy Ti6Al4V (also known as Ti64) which possesses good properties such as high strength, corrosion resistant, etc. 23 The present work is an attempt to polish AISI H13 die steel material using FJP process with a custom designed 3D printed Ti6Al4V (Ti64) multi-nozzle tool. The combined effect of spindle rotation and feed rate using 3D printed Ti64 tool in FJP process is very less reported in the available literature.…”

Design and characterization of selective laser‐melted Ti6Al4V–5Cu alloy for dental implants

“…Due to the addition of GO, the microhardness was significantly increased. The microstructure and mechanical properties of SLM Ti–6Al–4V alloy were studied by Gao et al [ 21 ] The results showed that the microstructure of the specimen was mainly composed of an acicular α′ phase. After heat treatment, the microstructure was composed of a primary α phase and an α/β lamellar structure.…”