Characteristics of Ti6Al4V Powders Recycled from Turnings via the HDH Technique

Abstract

Abstract:The objective of this research is for Ti6Al4V alloy turnings, generated during the machining of implants, to produce powders for the fabrication of Ti base coating via the cold spray method. In order to decrease the cost of powder production and increase the recycling rate of the turnings, the hydrogenation-dehydrogenation (HDH) process has been utilised. The HDH process consists of the following sequence: surface conditioning of the turnings, hydrogenation, ball milling (for powder production), and dehydrogenation. Afterwards, the properties of the recycled powder were analysed via phase, chemical, and morphological examinations, and size and flowability measurements. Usability of the powder in additive manufacturing applications has been evaluated via examining the characteristics of the deposit produced from this powder by the cold spray method. In short, promising results were obtained regarding the potential of the recycled powders in additive manufacturing after making minor adjustments in the HDH process.

Comparative Life Cycle Assessment and Cost Analysis of the Production of Ti6Al4V-TiC Metal–Matrix Composite Powder by High-Energy Ball Milling and Ti6Al4V Powder by Gas Atomization

“…Specifically, titanium matrix composites have good performance in corrosion resistance, high specific strength, high specific modulus, and heat resistance [43]. In particular, the Ti6Al4V alloy (Ti, 6 wt.% Al, 4 wt.% V), the focus of this study and which is the most widely used titanium alloy [44], has good characteristics such as a high strength to weight ratio, corrosion resistance, biocompatibility, and low thermal expansion [45]. Additionally, the use of TiC ceramic particles as a reinforcement phase is interesting due to their high melting point, elastic modulus, high hardness, low density, high flexure strength, good thermal conductivity, high resistance to corrosion and oxidation, and high thermal shock resistance [46].…”

Influence of processing parameters on dehydrogenation of TiH2 in the preparation of Ti–Nb: A review

“…Dehydrogenation, according to Gökelma et al. [ 85 ], should be performed under higher vacuum conditions, for a longer period of time, and with an optimised particle size range. They elaborated on the incomplete dehydrogenation process caused by a poor vacuum setup, in which peaks of TiH 1.5 were observed in Ti–6Al–4V XRD patterns even after the process was completed.…”

Mechanical Properties and Fracture Behavior of a TC4 Titanium Alloy Sheet

“…With the development of science and technology, the requirements for materials—especially metal materials—are increasing in various industrial fields. Titanium and titanium alloys are widely used in aerospace, military defense, and other high-tech fields due to their light weight, high specific strength, and good corrosion resistance [ 1 , 2 , 3 ]. Titanium alloy is mainly composed of α-phase, β-phase, and α + β two-phase titanium alloys; α + β two-phase titanium alloys are the most widely used, with good comprehensive performance and stable structure.…”