Modelling the oxygen diffusion profile in TA3V and T40 during heat-treatment under air between 620 and 850 °C

Lecomte, Jean-Sébastien; Lenarduzzi, Emmanuel; Weber, S.; Philippe, Marie-Jeanne; Petelot, D.

doi:10.1016/j.surfcoat.2005.03.035

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…Studies have been reported on the nitrogen pick-up tendency of titanium base alloy (during air exposure) by other investigators in the temperature range of 500 to 850°C. [62,63] The reasons for the no nitrogen pick-up tendency are attributed to: (1) the higher thermodynamic stability of oxide than nitrides for titanium and (2) the diffusion coefficient of nitrogen in titanium matrix is ten times smaller than that of oxygen. [62,63] Thus, the straining in the matrix was attributed to oxygen ingress only.…”

Section: Alpha Case Formation and Its Characterizationmentioning

confidence: 99%

Effect of Isothermal Heat Treatment at 760 °C on the Oxidation Behavior of Ti-Al-Zr Alloy

Sinha

Kain

2020

Metall Mater Trans A

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This study reports the oxidation behavior of an alpha titanium alloy, Ti-Al-Zr. The alloy was isothermally heat-treated in the air at 760°C for durations up to 700 hours. Heat treatment led to the formation of an oxide layer on the surface and an alpha case beneath the oxide layer. The oxide and the alpha case were characterized by optical microscopy, micro-hardness measurement, scanning electron microscopy (SEM), X-ray diffraction (XRD) and glow discharge optical emission spectroscopy (GDOES). The oxide was predominantly rutile; however, other metal oxides were also present. An oxide growth mechanism has been proposed. An alpha case of a maximum depth of 646 lm was measured for the specimen exposed for 700 hours. The diffusion coefficient of oxygen in the metal matrix was calculated to be 8.83 9 10 À14 m 2 /s. The alpha case formation led to straining of the matrix because of oxygen dissolution. Micro-strain was calculated from XRD measurements using the ''Modified Williamson-Hall (Modified W-H)'' method. A maximum micro-strain of 0.37 pct was calculated for the prismatic plane (110) for a 72 hours exposed specimen. A decreasing trend in the micro-strain value with increasing exposure time has been reported and explained.

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Section: Alpha Case Formation and Its Characterizationmentioning

confidence: 99%

Effect of Isothermal Heat Treatment at 760 °C on the Oxidation Behavior of Ti-Al-Zr Alloy

Sinha

Kain

2020

Metall Mater Trans A

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“…In fact, it is well established that the thermal treatment temperature of titanium alloys is strongly limited by their oxidation. For example, Schuman et al 24. studied the oxygen diffusion profile in commercially pure titanium (T40) and Ti3Al2.5V alloy during heat treatment in air between 620 and 850 °C.…”

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confidence: 99%

Thermal Treatment Optimization of Electrodeposited Hydroxyapatite Coatings on Ti6Al4V Substrate

2012

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Thermal behavior of electrodeposited hydroxyapatite (HAP) coating on a titanium alloy (Ti6Al4V) is investigated in order to optimize the heat treatment conditions for this prosthetic material. The synthesized coatings are annealed in air atmosphere at 400, 600, 800, and 1000 °C, and then characterized by X‐ray diffraction (XRD) and selected area electron diffraction (SAED) for structure and phases analysis. Scanning and transmission electron microscopy associated to energy dispersive X‐ray microanalysis (SEM‐EDXS and STEM) are used for morphology and composition analysis. The results show that when the electrodeposited coating is annealed at temperatures greater than 600 °C, a well‐crystallized HAP is obtained with a notable change of its morphology. However, at these temperatures the surface of Ti6Al4V alloy (uncoated zones of the implant) is deteriorated by the formation of a thick surface oxide layer. Therefore, we limit the heat treatment temperature for the electrodeposited coatings on a Ti6Al4V alloy at 550 °C. At this optimized temperature it is demonstrated that the link between the coating and the substrate is improved and the crystallinity of the coating is controlled which make it well bioactive.

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Determination of Minimum Machining Depth After Heat Treatment of ASTM Grade 2 Titanium Alloy

2012

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This paper reports on the development of a practical tool for determining minimum machining depths required after heat treatment of ASTM Grade 2 titanium alloys. Mechanical properties are adversely affected by the brittle alpha‐case that develops when titanium and its alloys are exposed to oxygen at elevated temperatures. This layer is normally removed by machining prior to putting the component into service. The exact depth of material that is required to be removed is dependent on the combined time and temperature of any prior heat treatment. This paper presents a study of oxygen diffusion in ASTM Grade 2 titanium alloy that was performed to quantify the rate of alpha‐case formation. A generalized method of predicting the depth of alpha‐case is discussed and a nomogram has been developed and presented as a tool for determining the minimum amount of material that needs to be removed.

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Modelling the oxygen diffusion profile in TA3V and T40 during heat-treatment under air between 620 and 850 °C

Cited by 7 publications

References 7 publications

Effect of Isothermal Heat Treatment at 760 °C on the Oxidation Behavior of Ti-Al-Zr Alloy

Effect of Isothermal Heat Treatment at 760 °C on the Oxidation Behavior of Ti-Al-Zr Alloy

Thermal Treatment Optimization of Electrodeposited Hydroxyapatite Coatings on Ti6Al4V Substrate

Determination of Minimum Machining Depth After Heat Treatment of ASTM Grade 2 Titanium Alloy

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