Removal of metallic impurities from Ti binary alloy scraps using hydrogen plasma arc melting

Oh, Jae Min; Lee, Back-Kyu; Suh, Chang–Yul; Lim, Joo Won

doi:10.1016/j.jallcom.2013.04.041

Cited by 18 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other words, MHT can effectively reduce the degree of aggregation during the solidification of TiBws and uniformly distribute their reinforcement. The temperature of the Ar-H2 plasma arc was hundreds of degrees higher than that of the Ar plasma arc only; that is, hydrogen caused more overheating at the molten composite surface [ 42 , 43 , 44 ]. Due to the same heat dissipation conditions of the water-cooled copper crucible, there was a larger temperature gradient in the hydrogenation molten pool.…”

Section: Resultsmentioning

confidence: 99%

Effects of Melt Hydrogenation on the Microstructure Evolution and Hot Deformation Behavior of TiBw/Ti-6Al-4V Composites

Yan

Wang

Wang³

et al. 2023

Materials

View full text Add to dashboard Cite

In this study, Ti-6Al-4V matrix composites reinforced with TiB ceramic whiskers were in situ synthesized and hydrogenated using the melt hydrogenation technique (MHT). The effects of MHT on the microstructure evolution and hot compression behavior of the composites were investigated by optical microscopy (OM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). Hot compression tests were performed at strain rates of 0.1/s, 0.01/s, and 0.001/s and temperatures of 800 °C, 850 °C, and 900 °C; the hot workability of composites significantly improved after hydrogenation, for example, the 900 °C peak flow stress of hydrogenated composites (43 MPa) decreased by 53.76% compared with that of unhydrogenated ones (93 MPa) at a strain rate of 0.01/s. Microstructural observations show that MHT can effectively facilitate the dispersion of TiB whiskers and induce the α/β lath refinement of the matrix in our as-cast hydrogenated composite. During hot compression, MHT effectively promoted the as-cast composite microstructure refinement, accelerated the dynamic recrystallization (DRX) generation, and reduced the stress concentration at the interface between the reinforcement and matrix; in turn, the hydrogenated composites presented low peak stress during hot compression.

show abstract

Section: Resultsmentioning

confidence: 99%

Effects of Melt Hydrogenation on the Microstructure Evolution and Hot Deformation Behavior of TiBw/Ti-6Al-4V Composites

Yan

Wang

Wang³

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…Sintering temperatures were in the range of 1273 -1673 K under a vacuum of 1 × 10 -3 Pa for 2h respectively. The chemical composition of the Ti-10Mo scrap used as raw materials was determined by glow discharge mass spectroscopy (GDMS, Autoconcept GD90, MSI Ltd., UK), and are listed in Table 1 [19]. The densities of the sintered bodies were measured by Archimedes method.…”

Section: Experimental Methodsmentioning

confidence: 99%

Comparison of Phase Evolution and Sintering Properties of Ti-10Mo Alloys Prepared using Bulk Scrap and Blended Elemental (BE) Powder

Choi¹,

Oh²,

Kim³

et al. 2022

Korean J. Met. Mater.

Self Cite

View full text Add to dashboard Cite

In this study, Ti-10Mo alloy powder and sintered bodies were successfully fabricated using a threestep process of acid/organic solvent cleaning, hydrogenation/dehydrogenation (HDH) of bulk Ti-Mo scrap, and pressureless vacuum sintering of the alloy powder. This process can be used to recycle valuable Ti alloy. And unlike remelting-based recycling processes, in which elements vaporize, this process maintains the original ratio of Ti and Mo and results in no loss of elements during HDH and sintering. We note, however, that the phases in the resulting Ti-Mo alloy were changed by HDH and the sintering processes, and as a result the phases of the alloy evolved differently than those of alloys prepared by the blending of Ti and Mo powders. XRD results of the processed sintered bodies revealed different pathways for the transformation of the crystal structure. As sintering temperature increased, the dominant phase changes in the crystal structure of the sintered bodies that used commercial powders were α' → α' + α'', while the phase changes for the recycled Ti-10Mo sintered bodies were α' + α'' → α'' + β. Although the density of the sintered body using commercial materials was generally higher at a lower sintering temperature than the density of the sintered body that used recycled powder, at 1673 K their respective densities were nearly identical. Moreover, the sintered body that contained scrap showed superior Vickers hardness after the dual phase (α + β) of Ti was reached, despite its relatively low density.

show abstract

“…Remelting titanium scrap with a low-oxygen virgin titanium sponge reduces the oxygen content in practical manufacture. Most of the remelting methods used today, alone and/or in combination, include vacuum arc remelting, cold hearth melting, induction skull melting, and hydrogen plasma arc melting [143][144][145][146][147]. With these processes, it is possible to remove volatile impurities, whereas high melting points and non-volatile metals are difficult to separate.…”

Section: Concentration Of Element (Mass%)mentioning

confidence: 99%

Sustainable Recovery of Titanium Alloy: From Waste to Feedstock for Additive Manufacturing

Tebaldo,

Gautier di Confiengo,

Duraccio

et al. 2023

Sustainability

View full text Add to dashboard Cite

Titanium and its alloys are widely employed in the aerospace industry, and their use will increase in the future. At present, titanium is mainly produced by the Kroll method, but this is expensive and energy-intensive. Therefore, the research of efficient and sustainable methods for its production has become relevant. The present review provides a description of the titanium recycling methods used to produce mostly aeronautical components by additive manufacturing, offering an overview of the actual state of the art in the field. More specifically, this paper illustrates that ilmenite is the main source of titanium and details different metallurgic processes for producing titanium and titanium alloys. The energy consumption required for each production step is also illustrated. An overview of additive manufacturing techniques is provided, along with an analysis of their relative challenges. The main focus of the review is on the current technologies employed for the recycling of swarf. Literature suggests that the most promising ways are the technologies based on severe plastic deformation, such as equal-channel angular pressing, solid-state field-assisted sintering technology-forge, and the Conform process. The latter is becoming established in the field and can replace the actual production of conventional titanium wire. Titanium-recycled powder for additive manufacturing is mainly produced using gas atomization techniques.

show abstract

Removal of metallic impurities from Ti binary alloy scraps using hydrogen plasma arc melting

Cited by 18 publications

References 16 publications

Effects of Melt Hydrogenation on the Microstructure Evolution and Hot Deformation Behavior of TiBw/Ti-6Al-4V Composites

Effects of Melt Hydrogenation on the Microstructure Evolution and Hot Deformation Behavior of TiBw/Ti-6Al-4V Composites

Comparison of Phase Evolution and Sintering Properties of Ti-10Mo Alloys Prepared using Bulk Scrap and Blended Elemental (BE) Powder

Sustainable Recovery of Titanium Alloy: From Waste to Feedstock for Additive Manufacturing

Contact Info

Product

Resources

About