Microstructure and Mechanical Properties of Ti-6Al-4V Fabricated by Vertical Wire Feeding with Axisymmetric Multi-Laser Source

Abstract

Vertical wire feeding with an axisymmetric multi-laser source (feeding the wire vertically into the molten pool) has exhibited great advantages over LAM (laser additive manufacturing) with paraxial wire feeding, which has an anisotropic forming problem in different scanning directions. This paper investigates the forming ability of vertical wire feeding with an axisymmetric multi-laser source, and the microstructure and mechanical properties of the fabricated components. It has been found that vertical wire feeding with an axisymmetric multi-laser source has a strong forming ability with no anisotropic forming problem when fabricating the complex parts in a three-axis machine tool. Most of the grains in the samples are equiaxed grains, and a small amount of short columnar grains exist which are parallel to each other. The microstructure of the fabricated samples exhibits a fine basket-weave structure and martensite due to the fast cooling rate which was caused by the small size of the molten pool and the additional heat dissipation from the feeding wire. The static tensile test shows that the average ultimate tensile strength is 1140 MPa in the scanning direction and 1115 MPa in the building direction, and the average elongation is about 6% in both directions.

Titanium Alloy Repair with Wire-Feed Electron Beam Additive Manufacturing Technology

“…It is noteworthy that the tensile properties reported for wire-fed laser deposited Ti6Al4V in the SRed condition (600°C, 4 hours) with orientations of D X and D Z included average UTS values of ∼975 MPa and ∼945 MPa, respectively, and average fracture strains of ∼4% and ∼8%, respectively [35]. For laser-deposited Ti6Al4V, the low fracture strains are a common problem [48] that may possibly be related to the martensitic microstructure and/ or gas shielding protection of the build. Also, previous research works on EBAM of Ti6Al4V have reported different values for the strength and ductility in the asdeposited condition; values for the UTS and total elongation have ranged from just under 800 MPa [20] to 925 MPa [18] and the total elongation from 9% [20] to 13% [18].…”

Effect of Tool-Path on Morphology and Mechanical Properties of Ti-6Al-4V Fabricated by Wire and Arc Additive Manufacturing

“…Their difference lies in the lap way between layers and layers. The first and third tool-path schemes are the same for repeated scaninng, the difference is that one is mainly for the side wire feeding, one for the front and back feeding to testing the influence of the wire-feeding directions as shown in Figure 2a&c [12]. The layer is interlaced with the previous layer in the second tool-path scheme as show in Figure 2b.…”

Synergy Between DFT Calculations and Experimental Studies on the Optimized Structures and the Antibacterial Potential of Some Novel Tetra‐ and Penta Coordinated Organic‐ Inorganic Hybrid Complexes of Titanium(IV)

“…Density functional theory (DFT) is the most widely used method to elucidate the structure of new materials and predict their electronic properties which have turned into enormous industrial endeavor . The chemistry of organic‐inorganic hybrid materials has attracted much attention as these materials demonstrate improved mechanical properties . Organic‐inorganic hybrid complexes of titanium(IV) find applications in the field of materials .…”