Alpha texture variations in additive manufactured Ti-6Al-4V investigated with neutron diffraction

Neikter, Magnus; Woracek, Robin; Maimaitiyili, Tuerdi; Scheffzük, Christian; Ströbl, Markus; Antti, Marta‐Lena; Åkerfeldt, Pia; Pederson, Robert; Bjerkén, Christina

doi:10.1016/j.addma.2018.08.018

Cited by 19 publications

(21 citation statements)

References 31 publications

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“…The microstructure and the material properties vary also depending on the build height as reported by [Baufeld 2011]. The possibility of a textured material [Neikter 2018] and the defect's presence [Chlebus 2011] could be a valid reason of this anisotropy. This could affect the cutting forces throughout the build parts.…”

Section: Effect Of Build Directionmentioning

confidence: 96%

“…The level of the plastic flow is higher for soft material and lower for hard material [Chen 2000]. Moreover, [Oishi 1995] suggests that by increasing the material hardness above a critical value, the build-up edge formed especially at low cutting and feed speeds, could be eliminated. As a result, the surface finish of the parts improves.…”

Section: Effect Of the Heat Treatmentmentioning

confidence: 99%

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FINISH MILLING STUDY OF Ti-6Al-4V PRODUCED BY LASER METAL DEPOSITION (LMD)

Kallel¹,

Duchosal²,

Altmeyer³

et al. 2019

MM SJ

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Components produced and repaired by the Laser Metal Deposition (LMD) process require finishmachining steps in order to improve the poor geometrical tolerance of the functional surfaces. In this work, the LMD process was conducted to build up samples from Ti-6Al-4V powders. The effect of the face milling process on surface roughness of the Ti-6Al-4V parts was studied in different build directions. The effect of the heat treatment was also considered. Changes in roughness and micro-hardness were evaluated and compared in each condition. Cutting forces were also measured in order to evaluate loading characteristic on the cutting insert. The heat-treated sample shows lower cutting forces in comparison with the as-build material. Different values of the surface roughness of the machined parts were obtained as a consequence of the microstructure variation.

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Section: Effect Of Build Directionmentioning

confidence: 96%

Section: Effect Of the Heat Treatmentmentioning

confidence: 99%

FINISH MILLING STUDY OF Ti-6Al-4V PRODUCED BY LASER METAL DEPOSITION (LMD)

Kallel¹,

Duchosal²,

Altmeyer³

et al. 2019

MM SJ

View full text Add to dashboard Cite

show abstract

“…According to the literature, the α' phase commonly associated with the extreme temperature change is usually observed in the SLM build Ti-6Al-4V [1,8,17]. The α phase, on the other hand, is associated with an isothermal cooling condition [2,10,17,31] and is commonly observed in the EBM build Ti-6Al-4V. Therefore, it is believed that that the minority phase present in the SLM build sample might be α' phase.…”

Section: Microstructures Of the Build Materialsmentioning

confidence: 99%

Phase Studies of Additively Manufactured Near Beta Titanium Alloy-Ti55511

et al. 2020

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The effect of electron-beam melting (EBM) and selective laser melting (SLM) processes on the chemical composition, phase composition, density, microstructure, and microhardness of as-built Ti55511 blocks were evaluated and compared. The work also aimed to understand how each process setting affects the powder characteristics after processing. Experiments have shown that both methods can process Ti55511 successfully and can build parts with almost full density (>99%) without any internal cracks or delamination. It was observed that the SLM build sample can retain the phase composition of the initial powder, while EBM displayed significant phase changes. After the EBM process, a considerable amount of α Ti-phase and lamella-like microstructures were found in the EBM build sample and corresponding powder left in the build chamber. Both processes showed a similar effect on the variation of powder morphology after the process. Despite the apparent difference in alloying composition, the EBM build Ti55511 sample showed similar microhardness as EBM build Ti-6Al-4V. Measured microhardness of the EBM build sample is approximately 10% higher than the SLM build, and it measured as 348 ± 30.20 HV.

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“…Texture can affect the ingress of hydrogen and the hydride formation [15,16] but the texture of EBM built Ti-6Al-4V has been shown to be weak [17]. Residual stresses, which are known to be present in various AM processes [18][19][20][21], can furthermore affect the fatigue crack growth (FCG) rate.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Crack Growth of Electron Beam Melted Ti-6Al-4V in High-Pressure Hydrogen

et al. 2020

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Titanium-based alloys are susceptible to hydrogen embrittlement (HE), a phenomenon that deteriorates fatigue properties. Ti-6Al-4V is the most widely used titanium alloy and the effect of hydrogen embrittlement on fatigue crack growth (FCG) was investigated by carrying out crack propagation tests in air and high-pressure H2 environment. The FCG test in hydrogen environment resulted in a drastic increase in crack growth rate at a certain Δ K, with crack propagation rates up to 13 times higher than those observed in air. Possible reasons for such behavior were discussed in this paper. The relationship between FCG results in high-pressure H2 environment and microstructure was investigated by comparison with already published results of cast and forged Ti-6Al-4V. Coarser microstructure was found to be more sensitive to HE. Moreover, the electron beam melting (EBM) materials experienced a crack growth acceleration in-between that of cast and wrought Ti-6Al-4V.

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Alpha texture variations in additive manufactured Ti-6Al-4V investigated with neutron diffraction

Cited by 19 publications

References 31 publications

FINISH MILLING STUDY OF Ti-6Al-4V PRODUCED BY LASER METAL DEPOSITION (LMD)

FINISH MILLING STUDY OF Ti-6Al-4V PRODUCED BY LASER METAL DEPOSITION (LMD)

Phase Studies of Additively Manufactured Near Beta Titanium Alloy-Ti55511

Fatigue Crack Growth of Electron Beam Melted Ti-6Al-4V in High-Pressure Hydrogen

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