Recycling of Titanium Scrap by Shear Assisted Processing and Extrusion (ShAPE)

Technical Report · Sun Sep 01 04:00:00 EDT 2024

DOI:https://doi.org/10.2172/2476698· OSTI ID:2476698

Whalen, Scott A. ^[1]; Reynolds, Anthony P. ^[2]; Chouhan, Devesh K. ^[1]; Komarasamy, Mageshwari ^[1]; Taysom, Brandon S. ^[1]; Overman, Nicole R. ^[1]; Canfield, Nathan L. ^[1]; Roosendaal, Timothy J. ^[1]

---

1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
2. Univ. of South Carolina, Columbia, SC (United States)

Titanium and its alloys are used in the aviation and automobile industries due to their remarkable strength to weight ratio, but, commonly, machining loss is high with ~90 wt.% of the material being converted to scrap. Recycling post-consumer Ti scrap directly into solid bulk products is a potential solution for repurposing valuable material. Further, reducing or even eliminating fresh Ti sponge during recycling might lead to lower energy and greenhouse gas emissions. In this study, a solid-phase process known as friction extrusion was utilized to recycle Ti-6Al-4V machining chips into solid wires which could be used as feedstock in additive manufacturing. The friction consolidation technique was first used to convert chips with varying degrees of oxygen content into solid billets for its use as feedstock material in subsequent friction extrusion. The extrudates were fabricated above the beta transition temperature, which was achieved by selecting rotation rate and feed rate, to process the billets near 1000°C using a tungsten-lanthana extrusion die. This work presents the first occurrence of friction extruded titanium alloy wires. The effect of friction extrusion on microstructural features, tensile properties, and texture are reported. Overall, the friction extrusion method is capable of recycling Ti-6Al-4V scrap directly into extruded wire.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 2476698
• Report Number(s): PNNL--36607
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
Friction Extrusion (FE)
Shear assisted processing and extrusions (ShAPE)
Titanium