Comparative study of the reactive elements effects on oxidation behavior of a Ni-based superalloy

Rehman, Khalil Ur; Sheng, Naicheng; Sang, Zhiru; Shuling, Xun; Wang, Zhenjiang; Xie, Jun; Hou, Guichen; Zhou, Yizhou; Sun, Xiaofeng

doi:10.1016/j.vacuum.2021.110382

Cited by 25 publications

(5 citation statements)

References 47 publications

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“…This is further supported by the Rietveld analysis, which showed that Ta1 had the lowest CrTaO 4 phase fraction. Contrary to other studies [ 29 , 30 ], no evidence of Ta 2 O 5 was observed in any of the investigated alloys. However, it is possible that Ta 2 O 5 may have formed as an initial oxide and subsequently reacted with Cr 2 O 3 to form CrTaO 4 through the following solid-state reaction: where denotes a solid.…”

Section: Discussioncontrasting

confidence: 99%

The Effect of Nb, Ta, and Ti on the Oxidation of a New Polycrystalline Ni-Based Superalloy

Wo,

Hardy,

Stone

2024

High Temperature Corrosion of mater.

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The effect of variations in Nb, Ta, and Ti concentrations in exchange for Al on the oxidation resistance of a new polycrystalline Ni-based superalloy (C19) was studied in air at 800 °C for up to 1000 h. An external scale of Ti-doped Cr2O3 and a sub-scale of discontinuous Al2O3 intrusions formed on the surface of all the studied alloys. Contrary to other reports, increasing the Nb concentration improved the oxidation performance and may have promoted the formation of a CrTaO4 layer, thereby reducing oxygen ingress. The addition of Ta also significantly improved oxidation resistance and reduced the depth of the Al2O3 intrusions. Increasing the Ti concentration did not significantly affect the oxidation performance, potentially due to the relatively low Ti concentrations investigated. Several of the studied alloys with modified Ta and Ti concentrations showed regions of continuous Al2O3 scale formation, suggesting that the compositions are in a transition regime between Cr2O3-forming and Al2O3-forming behaviour. The findings suggested that part of the Ti content in C19 could potentially be replaced with Nb, Ta and/or other elements to further enhance oxidation resistance and other desirable properties. Overall, the insights gained could serve as a guide to optimise the composition of C19 and similar alloys for enhanced oxidation resistance.

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Section: Discussioncontrasting

confidence: 99%

The Effect of Nb, Ta, and Ti on the Oxidation of a New Polycrystalline Ni-Based Superalloy

Wo,

Hardy,

Stone

2024

High Temperature Corrosion of mater.

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“…The oxides formed by the active elements in the alloy can be used as vacancy deposition sources to reduce the accumulation of vacancies and the formation of voids at the interface, thus improving the bonding strength of the oxide scale [35,42,43]. Similarly, previous studies [20][21][22][23][24] have shown that the active element yttrium enhances the adhesion between the oxide scale and the alloy substrate, and reduces the tendency of the oxide scale to spall.…”

Section: Effect Of Yttrium On Scale Adhesionmentioning

confidence: 89%

“…It was found that yttrium could not only promote the formation of the outer oxide scale and slow down the growth rate of the oxide scale, but also inhibit the occurrence of internal oxidation and nitridation, enhance the bonding of the oxide scale with the alloy matrix, and improve the anti-spalling performance of the oxide scale. Similarly, Weng et al [ 21 ], Rehman et al [ 23 ], and Shi et al [ 24 ] found that yttrium can enhance the adhesion between the oxide scale and the alloy matrix and reduce the tendency for spallation of the oxide scale.…”

Section: Introductionmentioning

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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“…Generally, the relationship between weight gain and oxidation time can be described as a power law, which is often used to understand oxidation kinetics [ 33 , 34 , 35 , 36 ]:

where Δ w is the mass change per unit area, k corresponds to an oxidation rate constant, t is the exposure time, n represents the oxidation mass gain reaction index, and C is a constant, which is equal to zero in current experimental conditions.…”

Section: Discussionmentioning

confidence: 99%

The Effects of Alloying Elements Cr, Al, and Si on Oxidation Behaviors of Ni-Based Superalloys

Ding

Wei

et al. 2022

Materials

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Oxidation behaviors of three Ni-based model alloys and pure Ni in the temperature range of 700–1200 °C are investigated to reveal effects of Cr, Al, and Si on the oxidation resistance of Ni-based superalloys. The formation and integrity of consecutive chromia or alumina layers are important for excellent oxidation resistance. The addition of 20 at.% Cr can effectively improve the oxidation resistance of Ni-based alloys by forming a thin chromia film below 1000 °C, while adding 15 at.% Al has a beneficial effect on the oxidation resistance of Ni-based alloys at temperatures above 900 °C. The addition of 2 at.% Si to Ni-Al alloy is insufficient to form a protective SiO2 layer but can accelerate the formation of alumina, which enables Ni-Al alloy to form a consecutive inner alumina layer at a relatively low temperature of 800 °C and further improve the oxidation resistance above 800 °C.

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Comparative study of the reactive elements effects on oxidation behavior of a Ni-based superalloy

Cited by 25 publications

References 47 publications

The Effect of Nb, Ta, and Ti on the Oxidation of a New Polycrystalline Ni-Based Superalloy

The Effect of Nb, Ta, and Ti on the Oxidation of a New Polycrystalline Ni-Based Superalloy

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

The Effects of Alloying Elements Cr, Al, and Si on Oxidation Behaviors of Ni-Based Superalloys

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