High temperature oxidation and embrittlement at 500–600 °C of Ti-6Al-4V alloy fabricated by Laser and Electron Beam Melting

Casadebaigt, Antoine; Hugues, Jonathan; Monceau, Daniel

doi:10.1016/j.corsci.2020.108875

Cited by 63 publications

(38 citation statements)

References 73 publications

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“…This leads to the conclusion that grain size has little or no effect on oxygen diffusion. The same conclusions were drawn by Casadebaigt et al on a TA6V alloy made by additive manufacturing [17]. For these alloys manufactured using electron and laser beam melting, authors reported that a hot isostatic pressure (HIP) treatment did not have an effect on mass variations nor on oxygen diffusion coefficients, despite an important coarsening of the microstructure resulting from the HIP.…”

Section: Introductionsupporting

confidence: 71%

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High-Temperature Oxidation Behavior of Ti6242S Ti-based Alloy

et al. 2021

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The aircraft industry is always looking for improved efficiency through higher inservice engine temperatures and lighter structures. Titanium-based alloys are good candidates for such applications because of their high specific strength. However, when exposed to high-temperature oxidizing environments, a large amount of dissolved oxygen can be found in such alloys beneath the growing oxide scale, possibly leading to embrittlement. Consequently, evaluating the oxidation resistance of these alloys is essential. With this aim, long-term oxidation tests were carried out on Ti6242S alloy between 500 and 650 °C to study the effect of temperature, surface preparation and microstructure on oxide scale and oxygen dissolution. While increasing the temperature from 560 to 625 °C led to accelerated oxidation kinetics, surface preparation had no noticeable effect on mass variations and oxygen diffusion profiles. Regarding microstructure, when comparing Ti6242S samples having similar α-phase fraction but very different microstructures (fineness and morphology), there wasn't any significant effect found on mass change and oxygen diffusion after 1 kh at 650 °C.

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Section: Introductionsupporting

confidence: 71%

“…Excessively high temperatures can modify oxidation regimes, as shown in Ti6242 and Ti6242S alloys by Calvert and Kosaka and Gaddam et al, respectively [13,15]. This can also lead to modified contents of alloying elements between phases, as found in the TA6V alloy [16,17].…”

Section: Introductionmentioning

confidence: 98%

High-Temperature Oxidation Behavior of Ti6242S Ti-based Alloy

et al. 2021

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“…This is in good agreement with the literature values determined for Ti6Al4V in a similar temperature range. [ 52,53 ]…”

Section: Discussionmentioning

confidence: 99%

“…This is in good agreement with the literature values determined for Ti6Al4V in a similar temperature range. [52,53] After the two-step process, the diffusion depth is enhanced to 85 μm. The reduced oxygen concentration at the gassubstrate interface compared with the single-step process indicates that the oxide layer completely dissolved before the end of the second process step and thus could no longer serve as oxygen reservoir.…”

Section: Oxygen Diffusion Zonementioning

confidence: 99%

Improving the Adhesion of a Hard Oxide Layer on Ti6Al4V by a Three‐Step Thermal Oxidation Process

et al. 2021

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Thermal oxidation is a promising technique to improve the tribological properties of Ti6Al4V. Herein, a single-step process consisting of oxidation in air, a two-step process with an additional solid-state oxide layer reduction step under vacuum, and a three-step process with an appended final oxidation step in air are applied to Ti6Al4V. The oxide layer adhesion after the three-step process is improved compared with the single-step process. This improved adhesion is not due to a different nature of the oxide layers because oxide layers obtained during the single-step and three-step process show a similar morphology and composition. Instead, it is ascribed to the presence of an optimized oxygen diffusion zone with two distinct regions: a gradual decrease in oxygen concentration from the maximum possible oxygen concentration at the oxide-substrate interface until a depth of 20 μm followed by a near-linear decrease until a depth of about 85 μm. Both regions are also visible in the correlated microhardness-depth profile.

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“…This function is highly helpful in the manufacture of titanium-6aluminium-4vanadium (Ti6Al4V) parts since it is possible to monitor the small amounts of interstitial components during manufacturing [69]. Besides, a high temperature of around 700 degrees Celsius is established in the system throughout the construction of the component to decrease excess tensions and thereby warpage and distortion [70].…”

Section: Electron Beam Meltingmentioning

confidence: 99%

A review of additive manufacturing of Mg-based alloys and composite implants

Zamani

Ghazanfari

Erabi

et al. 2021

jcc

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Magnesium based materials are considered promising biodegradable metals for orthopedic bone implant applications as they exhibit similar density and elastic modulus to that of bone, biodegradability, and excellent osteogenic properties. The use of Mg based biomaterials eliminates the limitations of currently used implant materials such as stress shielding and the need for the second surgery. Recently, the development of Mg-based implants has attracted significant attention. Additive manufacturing is one of the effective techniques to develop Mg based implants. Additive manufacturing which could be named 3D printing is a transformative and rapid method of producing industrial parts with in the acceptable dimensional range. Therefore, recent investigations have tried to apply this method for the development of Mg-based implants. This state-of-the-art review focuses on the additive manufacturing of Mg biodegradable materials and their in-vitro corrosion and degradation, and mechanical properties. The future directions to develop Mg biodegradable materials are reported through summarization of current achievements.

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High temperature oxidation and embrittlement at 500–600 °C of Ti-6Al-4V alloy fabricated by Laser and Electron Beam Melting

Cited by 63 publications

References 73 publications

High-Temperature Oxidation Behavior of Ti6242S Ti-based Alloy

High-Temperature Oxidation Behavior of Ti6242S Ti-based Alloy

Improving the Adhesion of a Hard Oxide Layer on Ti6Al4V by a Three‐Step Thermal Oxidation Process

A review of additive manufacturing of Mg-based alloys and composite implants

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