Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000°C

Zhu, ZY; Cai, Yuanfei; Gong, You-jun; Shen, Guoping; Tu, Yu-guo; Zhang, Guofu

doi:10.1007/s12613-017-1461-y

Cited by 15 publications

(3 citation statements)

References 19 publications

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“…Al has the highest affinity for oxygen except for yttrium and is prone to forming stable Al 2 O 3 oxides as shown in Figure 15 . The grain boundaries are rapid diffusion channels for oxygen, and the internal oxidation of Al is controlled by the inward diffusion of oxygen ions through the external oxide layer and grain boundaries [ 53 ]. The content of Cr in GH4169 superalloy is much higher than that of Al, and the self-diffusion coefficient of Al in Al 2 O 3 is several orders of magnitude smaller than that of Cr and Ti in their oxides [ 31 ].…”

Section: Discussionmentioning

confidence: 99%

Effect of Yttrium Additions on the High-Temperature Oxidation Behavior of GH4169 Ni-Based Superalloy

Wang,

Liu,

Yang

et al. 2024

Materials

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The effect of the active element yttrium and its content on the oxidation behavior of GH4169 Ni-based superalloy at extreme temperature was studied by isothermal oxidation experiments. The results show that the oxide scale of GH4169 alloy presents a multi-layer structure, in which the continuous and dense Cr2O3 oxide layer is located in the subouter layer (II layer) and the continuous Nb-rich layer is in the subinner layer (III layer). These layers can inhibit the diffusion of oxygen and alloying elements, preventing the further oxidation of the alloy. The appropriate addition of yttrium can promote the selective oxidation of Cr element, reduce the thickness of the oxide scale and the oxidation rate of the alloy, inhibit the formation of voids at the interface of the oxide scale/alloy matrix, improve the resistance of the alloy to spalling as well as the adhesion of the oxide scale, and improve the high-temperature oxidation resistance of the alloy. Of those tested, the alloy containing 0.04 wt.%Y has the lowest oxidation weight gain, the slowest oxidation rate, and less oxide scale spalling. Based on this, the effect of yttrium on the high-temperature oxidation behavior of GH4169 Ni-based superalloy and its mechanism were revealed.

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Section: Discussionmentioning

confidence: 99%

Effect of Yttrium Additions on the High-Temperature Oxidation Behavior of GH4169 Ni-Based Superalloy

Wang,

Liu,

Yang

et al. 2024

Materials

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“…The formation of a thin surface layer of alumina can be explained as follows. The oxide layer is mostly based on a mixed oxide of titanium and aluminum, formed due to the close values of Gibbs free energy (−780 and −850 kJ/mol, respectively) [39,40]. This oxide does not act as an effective barrier to oxygen diffusion [41,42].…”

Section: Annealing and Oxidationmentioning

confidence: 99%

TiAl-Based Oxidation-Resistant Hard Coatings with Different Al Contents Obtained by Vacuum-Pulse-Arc Granule Melting

Sheveyko,

Kuptsov,

Kiryukhantsev-Korneev

et al. 2023

Coatings

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A method was proposed for increasing the oxidation resistance of promising wrought Ti2AlNb ortho-alloys by depositing γ-TiAl-based coatings. Using original vacuum pulse-arc melting of 100 μm thick granule layers, coatings with different Al/Ti ratios and a thickness of 50–60 µm were obtained on the surface of the Ti50Al25Nb25 alloy. Granules Ti50Al44Nb4.9Mo1B0.1 (at.%), 20–60 μm in size, were employed. To vary Al content, initial granules and their mixture with Al powder were used. Excellent adhesion of the coatings is ensured by the similar chemical composition and structure of the substrate and coatings, as well as micro-metallurgical reactions between granules and the substrate that occur during treatment. The resulting coatings had a submicron gradient structure consisting of TiAl and Ti3Al intermetallic compounds. During oxidation at 850 °C for 10 h, an oxide layer consisting of a mixture of α-Al2O3, TiO2, and AlNbO4 was formed on the coating surfaces. With an increase in the annealing duration to 100 h, a dense α-Al2O3 oxide layer, approximately 0.5 µm thick, was formed over the primary oxide mixture, the quality of which was higher in coatings enriched with aluminum.

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“…Due to its convenient operation, the treated samples have high hardness and good wear resistance to be applied widely. Based on this, some studies demonstrated that Ti can be modified by boriding; many methods are commonly used to enhance the surface hardness of Ti, such as dissolved salt impregnation, electrolytic boriding, heat treatment, and magnetron sputtering [8][9][10][11][12][13]. During these methods, there are few reports of boriding by dissolved salt impregnation, especially with regard to the actual value of diffusion compared to the calculated value.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Mechanical, Tribological, and Fricative Reduction Properties of Pure Titanium by Boriding

Chen

Koyama

2021

Applied Sciences

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Surface boriding of pure titanium was performed using dissolved salt impregnation to modify the surface hardness and improve wear performance. The effect of boriding temperature (950–1150 °C) on the microstructure, composition, and room-temperature tribological properties of the borided samples was investigated by X-ray diffraction, scanning electron microscopy, and ball-on-disc tribometry, respectively. Gibbs free energy was also calculated to evaluate the compounds generated during the boriding at different temperatures. After a detailed analysis of the crystal structures and the growth morphologies of TiB, the diffusion mechanisms for B atoms in TiB and TiB2 were discussed in the present report. The boriding temperature had a large effect on the microstructure, mechanical properties, and room-temperature tribological behavior of the borided samples, attributed to the changes in the composition and the increased hardened layer under elevated boriding temperature. The modeling of layer growth kinetics was also discussed in this paper. The actual value of hardened layer thickness was compared to the calculated value, and the difference was analyzed. The fricative value of the borided samples showed a minimum value of 88.9 dB for a boriding temperature of 1050 °C. The depth and width of the wear tracks decreased gradually with increasing boriding temperature. The worn surface of the samples borided at higher temperatures showed very good wear resistance. A boriding condition of 1050 °C was considered optimal, as it provided sufficiently high surface hardness and a low fricative value to reduce vibrations during practical use.

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Isothermal oxidation behavior and mechanism of a nickel-based superalloy at 1000°C

Cited by 15 publications

References 19 publications

Effect of Yttrium Additions on the High-Temperature Oxidation Behavior of GH4169 Ni-Based Superalloy

Effect of Yttrium Additions on the High-Temperature Oxidation Behavior of GH4169 Ni-Based Superalloy

TiAl-Based Oxidation-Resistant Hard Coatings with Different Al Contents Obtained by Vacuum-Pulse-Arc Granule Melting

Improvement of Mechanical, Tribological, and Fricative Reduction Properties of Pure Titanium by Boriding

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