Titanium

Donachie, Matthew J.

doi:10.31399/asm.tb.ttg2.9781627082693

Cited by 761 publications

(107 citation statements)

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“…The temperature of 950 °C was the boundary of the end of the recrystallization process (for α + β titanium alloys produced by conventional methods [ 25 ]). At this temperature, a morphology of the α and β plates inside the grain changed ( Figure 3 a).…”

Section: Resultsmentioning

confidence: 99%

Features of Heat Treatment the Ti-6Al-4V GTD Blades Manufactured by DLD Additive Technology

et al. 2021

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Additive manufacturing of titanium alloys is one of the fastest growing areas of 3D metal printing. The use of AM methods for parts production in the aviation industry is especially promising. During the deposition of products with differently sized cross-sections, the thermal history changes, which leads to non-uniformity of the structure and properties. Such heterogeneity can lead to failure of the product during operation. The structure of deposited parts, depending on the thermal cycle, may consist of α’, α + α’ + β’, and α + β in different ratios. This problem can be solved by using heat treatment (HT). This paper presents research aimed towards the determination of optimal heat treatment parameters that allows the reception of the uniform formation of properties in the after-treatment state, regardless of the initial structure and properties, using the example of a deposited Ti-6Al-4V gas turbine blade.

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Section: Resultsmentioning

confidence: 99%

Features of Heat Treatment the Ti-6Al-4V GTD Blades Manufactured by DLD Additive Technology

et al. 2021

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“…Such oxides and nitrides are known to be detrimental to the fatigue performance of manufactured parts [ 44 ]. As stated by Donachie [ 45 ], an increase in the oxygen and nitrogen content in solution can lead to an increase in the strength and decrease in the ductility which further leads to embrittlement.…”

Section: Resultsmentioning

confidence: 99%

Powder Reuse Cycles in Electron Beam Powder Bed Fusion—Variation of Powder Characteristics

Shanbhag

Vlasea

2021

Materials

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A path to lowering the economic barrier associated with the high cost of metal additively manufactured components is to reduce the waste via powder reuse (powder cycled back into the process) and recycling (powder chemically, physically, or thermally processed to recover the original properties) strategies. In electron beam powder bed fusion, there is a possibility of reusing 95–98% of the powder that is not melted. However, there is a lack of systematic studies focusing on quantifying the variation of powder properties induced by number of reuse cycles. This work compares the influence of multiple reuse cycles, as well as powder blends created from reused powder, on various powder characteristics such as the morphology, size distribution, flow properties, packing properties, and chemical composition (oxygen and nitrogen content). It was found that there is an increase in measured response in powder size distribution, tapped density, Hausner ratio, Carr index, basic flow energy, specific energy, dynamic angle of repose, oxygen, and nitrogen content, while the bulk density remained largely unchanged.

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“…After initial machining to create the uniform and square test blocks, all samples were subjected to heat treatments. Ti-6Al-4V is categorized as an - alloy based on its composition and ability to form both the HCP  phase along with the BCC  phase [13]. Common heat treatments preformed on Ti 6Al-4V include annealing, solution treating, stress relaxing, and aging.…”

Section: Heat Treatingmentioning

confidence: 99%

Impacts of Machining and Heat Treating Practices on Residual Stresses in Alpha-Beta Titanium Alloys

Frame¹,

Rambarran²,

Sala³

et al. 2019

Heat Treat 2019: Proceedings From the 30th Heat Treating Society Conference and Exposition

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Machining and thermal processing can introduce undesirable residual stresses and distortion in titanium alloy components, and although the distribution and magnitude of these residual stresses is highly relevant for component and process design in the aerospace industry, the relationships between processing variables, processing steps, residual stress signature, and subsurface microstructures are not well understood. The current study reports on the preliminary results of experiments designed to mimic typical machining and thermal processing practices for aerospace alpha-beta Ti alloys. Traditional climb cutting and high-speed peel cutting operations are included in CNC machining experiments, and both stress-relieving and aging heat treatments are considered for thermal processing experiments. Characterization of samples includes strain measurement using the sin2ψ method with X-Ray Diffraction as well as microstructural characterization using traditional metallographic techniques. The results of this study point to potential areas for improving tool approach in machining practices for α-β Ti alloys.

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Titanium

Cited by 761 publications

References 0 publications

Features of Heat Treatment the Ti-6Al-4V GTD Blades Manufactured by DLD Additive Technology

Features of Heat Treatment the Ti-6Al-4V GTD Blades Manufactured by DLD Additive Technology

Powder Reuse Cycles in Electron Beam Powder Bed Fusion—Variation of Powder Characteristics

Impacts of Machining and Heat Treating Practices on Residual Stresses in Alpha-Beta Titanium Alloys

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