Machinability of additively manufactured titanium alloys: A comprehensive review

Stiffening near-net-shape functional parts of Inconel 718 LPBF considering material anisotropy and subsequent machining issues

Development of lattice structure with selective laser melting process: A state of the art on properties, future trends and challenges

Machinability of 3D printed metallic materials fabricated by selective laser melting and electron beam melting: A review

Abstract Various laser powder bed fusion (LPBF) process parameters must be considered as they can independently affect the properties of end-product. However, many studies simply examine one or two LPBF process parameters. Laser power, scan speed, scan spacing, and layer height are the four primary LPBF process parameters that contribute to volumetric energy density (VED) used in LPBF. VED is often used as an optimization metric for LPBF process parameters, because it takes all four major parameters into consideration. Thus, this paper focuses on the effect of VED on the morphology and properties of part, and also discusses on the interrelationship between all four parameters. Common range used for each parameter is 70–400 W for laser power, 70–1800 mm/s for scan speed, 50–140 µm for scan spacing, and 20–50 µm for layer height. It can be seen as the VED increased, the microstructure of as-built titanium alloy Ti6Al4V components exhibited smaller α’ martensite size and larger columnar β grain. High VED can also reduce porosity and defect formation, which will help in increasing part density. The lowest surface roughness reported for LPBF Ti6Al4V is 4.91 µm. Meanwhile, the maximum microhardness obtained is 443 HV and the highest tensile strength achieved is 1400 MPa. The VED used for studies that obtained these results are in the range of 55–65 J/mm 3 . Thus, it can be concluded that the most suitable VED for LPBF printing of Ti6Al4V is around 55–65 J/mm 3 . 

https://link.springer.com/content/pdf/10.1007/s40964-022-00328-0.pdf

Review on volumetric energy density: influence on morphology and mechanical properties of Ti6Al4V manufactured via laser powder bed fusion

https://hal.univ-lorraine.fr/hal-03096965/document

Consideration of SLM additive manufacturing supports on the stability of flexible structures in finish milling

Additive manufacturing (AM) processes are particularly interesting to reduce the weight of a part by associate lattice structures to thin skin. To ensure a finished product with the dimensional and structural requirements of an industrial part, a post-machining is necessary. The proposed work studied the surface integrity after the dry precision turning of a thin wall of Ti-6Al-4V part produced by sintering laser melting (SLM), using uncoated carbide tool with various cutting angles and tool nose radius. A design of experimental approach (DOE) is used. Different techniques are combined to characterize cutting performance and surface integrity including cutting forces, residual stresses, micro-hardness, and SEM microscopy. Observation reveals that the finish-cutting of near net shape part obtain by SLM induces a minimal effect on surface integrity. Even the dry condition, the low thermal conduction of titanium alloys and the 1 mm skin thickness obtained after cutting operation, damages on surface and subsurface are negligible (< 1 μm).

Precision turning analysis of Ti-6Al-4V skin produced by selective laser melting using a design of experiment approach

The numerical approach of topological optimization allows determining the optimal distribution of the material in a given volume in the function of an objective. This approach has recently regained...

https://www.tandfonline.com/doi/pdf/10.1080/10255842.2020.1812167

Topology optimization for the control of load transfer at the bone-implant interface: a preliminary numerical study

Middle ear surgery requires from the surgeon a high level of expertise because of the very small anatomical parts involved and the proximity of many at-risk structures. To perfectly manage the gest...

G. Le Coz

Papers

Consideration of SLM additive manufacturing supports on the stability of flexible structures in finish milling

Precision turning analysis of Ti-6Al-4V skin produced by selective laser melting using a design of experiment approach

Topology optimization for the control of load transfer at the bone-implant interface: a preliminary numerical study

Evaluation of the milling’s response of a new bi-material 3D-printed model of temporal bone used for surgeons’ training