Towards the Development of Affordable Titanium Alloy Components

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (15 November 2019) | Viewed by 8338

Special Issue Editor


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Guest Editor
Department of Materials Science and Engineering, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, UK
Interests: Titanium alloys; powder metallurgy; thermomechanical processing; microstructural analysis; modelling and simulation
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Special Issue Information

Dear Colleagues,

The aim of this Special Issue is to capture the current status and emerging technologies for lowering the cost of titanium alloy components. Subjects of interest include (1) new extraction process routes that may compete with current Kroll extraction technology in the longer term; (2) the recycling of titanium alloy products into usable product and components; (3) emerging downstream processing methods that aim to reduce mill product or net shape component costs; and (4) cost reductions and modifications in conventional titanium alloy ingot-wrought processing. Contributions must demonstrate significant advances in our understanding of the processing of titanium alloy material and components, with an emphasis on the effect of processing on microstructure and mechanical properties. The use of new modeling techniques to accelerate such developments is also of interest to the community. Developments of additive manufacturing from titanium alloy powder are not within this scope, but the production of cheaper AM powder and developments of wire additive manufacturing to near net shape are of interest for this Special Issue.

Dr. Martin Jackson
Guest Editor

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Keywords

  • Downstream processing
  • extraction
  • recycling
  • titanium alloys
  • phase transformations

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Published Papers (1 paper)

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Research

16 pages, 7256 KiB  
Article
FAST-forge of Titanium Alloy Swarf: A Solid-State Closed-Loop Recycling Approach for Aerospace Machining Waste
by Nicholas S. Weston and Martin Jackson
Metals 2020, 10(2), 296; https://doi.org/10.3390/met10020296 - 24 Feb 2020
Cited by 25 | Viewed by 7849
Abstract
Titanium alloys have excellent properties, but components are very expensive due to the high levels of processing required, such as vacuum melting, multi-stage forging, and machining. As a result, forged titanium alloy components are largely exclusive to the aerospace industry, where a high [...] Read more.
Titanium alloys have excellent properties, but components are very expensive due to the high levels of processing required, such as vacuum melting, multi-stage forging, and machining. As a result, forged titanium alloy components are largely exclusive to the aerospace industry, where a high strength-to-weight ratio, corrosion resistance, and excellent fatigue resistance are essential. However, a typical buy-to-fly ratio for such components is approximately 9:1, as much of the forged billet is machined to swarf. The quantity of waste titanium alloy swarf generated is increasing as aircraft orders, and the titanium components contained within them, are increasing. In this paper, waste swarf material has been recycled using the two-step solid-state FAST-forge process, which utilizes field assisted sintering technology (FAST) followed by hot forging. Cleaned Ti-6Al-4V swarf was fully consolidated using the FAST process at sub-transus and super-transus temperatures, followed by hot forging at sub-transus temperatures at different strain rates. It was demonstrated that swarf-derived Ti-6Al-4V FAST billets have equivalent hot forging flow behaviour and resultant microstructures when directly compared to equivalently processed conventional expensive hydride–dehydride powder, and previously reported Kroll-derived melt-wrought material. This demonstrates that titanium swarf is a good quality feedstock for downstream processing. Additionally, FAST-forge is a viable processing route for the closed-loop recycling of machining waste for next-generation components in vehicles and non-aerospace applications, which is game changing for the economics of titanium alloy components. Full article
(This article belongs to the Special Issue Towards the Development of Affordable Titanium Alloy Components)
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