Dynamic Tensile Response of Additively Manufactured Ti6Al4V With Embedded Spherical Pores

Abstract

The dynamic tensile response of additively manufactured (AM) dense and porous Ti6Al4V specimens was investigated under quasi-static and dynamic tension. The porous specimens contained single embedded spherical pores of different diameters. Such artificial spherical pores can mimic the behavior of realistic flaws in the material. It was found that beyond a certain pore diameter (Ø600 μm), the failure is determined according to the pore location, characterized by an abrupt failure and a significant decrease of ductility, while below that diameter, necking and fracture do not occur at the pore. The dynamic tensile mechanical behavior of the additively manufactured dense material was found to be similar to that of the conventional equivalent material, but the ductility to failure of the latter is observed to be higher.

Ti-6Al-4V hybrid structure mechanical properties—Wrought and additive manufactured powder-bed material

“…It is not a surprise then, that with the emergence of additive manufacturing (AM) techniques, Ti-6Al-4V was one of the first metallic material to be incorporated into a commercial critical component [7]. Throughout the development of AM technology, Ti-6Al-4V was studied extensively in the scientific literature [8][9][10][11][12][13][14][15][16][17] as well as by aerospace and BioMed industries. Over the last decade, Ti-6Al-4V was intensively integrated into various additive manufacturing processes, demonstrating remarkable business case reasoning through improved functionality, efficient material usage, and cost reduction.…”

A constitutive structural parameter c b for the work hardening behavior of additively manufactured Ti‐6Al‐4V

“…Thirty samples are considered for analysis from the literature survey 10–17 as produced by different AM process methods. These AM processes include methods referred to as LPBF or SLM, wherein a laser is scanned in a select raster pattern to provide fusion of powders from a 20‐ to 100‐μm‐thick layer.…”

“…The Morris Jr. model was later developed to assess the mechanical behavior of drawn wires from Ti alloys 8 across a wide range of strain rate and to characterize the tensile behavior 9 of 316L LPBF AM material. A survey of the literature on Ti‐6Al‐4V AM material is now undertaken to explore the utility of this model to distinguish between the tensile behaviors of SLM and EBM materials 10–17 . Thirty examples are now selected that offer a representative sampling of alternative AM processing methods and postprocessing treatments which provide a wide range of tensile behaviors.…”

Microwave Sintering of Ti6Al4V: Optimization of Processing Parameters for Maximal Tensile Strength and Minimal Pore Size

“…However, in the pressureless microwave sintering, the mechanical properties of the components are affected by the presence of pores that are inevitable. Various research groups have evaluated the mechanical properties in the additive manufactured components [5][6][7]. Kumar et al [6] observed that ductility decreases with the increase of pore size in conventional sintering of the Ti6Al4V alloy.…”

“…Chawla et al noticed that the tensile strength, Young's modulus, fatigue strength, and strain at failure improved with the decrease in pore size and pore densities in the sintering of steel [7]. Fadida et al observed that the presence of pores and their sizes influence the failure mechanism and mechanical properties of the parts produced by additive manufacturing processes [5].…”