Experimental and theoretical study of the effect of Si on the oxidative behavior of Ti-6Al-4V alloys

Maeda, Kodai; Suzuki, Satoshi; Ueda, Kyosuke; Kitashima, Tomonori; Bhattacharya, Somesh Kr.; Sahara, Ryoji; Narushima, Takayuki

doi:10.1016/j.jallcom.2018.10.291

Cited by 24 publications

(19 citation statements)

References 34 publications

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“…The formation of α-case was suppressed by the addition of Si [42], which agreed well with experimental results [43]. The demand for Ti powder for AM, medical, and aerospace fields is expected to rise in the future.…”

Section: Computational Simulationsupporting

confidence: 88%

Recent activities of titanium research and development in Japan

Narushima

Sugizaki²

2020

MATEC Web Conf.

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Section: Computational Simulationsupporting

confidence: 88%

Recent activities of titanium research and development in Japan

Narushima

Sugizaki²

2020

MATEC Web Conf.

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“…In high temperature environments, titanium alloys form an oxide layer (OL) [6][7][8]. For Ti, Zr or Hf alloys however, the high solubility of oxygen in the metal induces the formation of an oxygen diffusion zone (ODZ) [9][10][11][12][13][14][15][16][17][18][19], which can be more detrimental than the external oxide scale. This ODZ affects mechanical properties: tensile strength increases while ductility decreases [20][21][22][23][24][25][26].…”

Section: Titanium Alloysmentioning

confidence: 99%

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

2020

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The oxidation kinetics of Ti-6Al-4V alloys fabricated by LBM and EBM, HIP-treated or not, are similar to that of a rolled annealed Ti-6Al-4V alloy, as regards oxide layer and oxygen diffusion layer thickness. Kinetics of oxygen ingress in the metal is independent of the alloy microstructure. At room temperature, the thickness of the brittle layer after a tensile test corresponds to the oxygen diffusion layer, with an oxygen concentration above a critical value that is clearly below 1 at %.

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“…The new model that uses the square root of the error function (Eq. 12) was applied to determine the oxygen diffusion coefficients from microhardness profiles obtained on Ti-64 titanium alloys between 550 and 850 °C found in the literature [16,[28][29][30][31]. The resulting data were plotted in an Arrhenius diagram (Fig.…”

Section: Application 2: Arrhenius Diagram Of the Ti-64 Alloymentioning

confidence: 99%

Oxygen Diffusion Modeling in Titanium Alloys: New Elements on the Analysis of Microhardness Profiles

Vaché

Monceau

2020

Oxid Met

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This study focuses on the diffusion of oxygen in titanium alloys during high-temperature oxidation. In particular, the model used to obtain thermokinetic coefficients from microhardness profiles was investigated. A literature review shows that microhardness profiles are modeled by a simple error function in the same way as oxygen concentration profiles obtained by microprobe analysis (EPMA). The analysis of literature shows that the hypothesis of a linear relationship between microhardness and oxygen content is not true over the entire oxygen concentration range and that a parabolic relationship is empirically more accurate. A new modeling equation taking into account this parabolic law is proposed as well as a simplified and easier to use form. The relative error of the diffusion coefficients obtained using the simplified equation was then determined. This new model was applied to the experimental microhardness profile of a Ti-6242s sample oxidized at 625 °C. The resulting oxygen diffusion coefficient is in excellent agreement with the one determined from EPMA profile using the classic error function model. Finally, other data from literature were analyzed with the new model to obtain an Arrhenius diagram of oxygen diffusivity in Ti-64 alloy between 550 and 850 °C. This diagram gives thermokinetic coefficients D 0 = 1.1 × 10 −5 exp −191 kJ/mol RT that are close to those reported for pure α-Ti in the temperature range 550-850 °C.

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Experimental and theoretical study of the effect of Si on the oxidative behavior of Ti-6Al-4V alloys

Cited by 24 publications

References 34 publications

Recent activities of titanium research and development in Japan

Recent activities of titanium research and development in Japan

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

Oxygen Diffusion Modeling in Titanium Alloys: New Elements on the Analysis of Microhardness Profiles

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