Effects of Al, Cr, and Ti on the Oxidation Behaviors of Multi-component γ/γʹ CoNi-Based Superalloys

Zhuang, Xiaoli; Li, Longfei; Feng, Qiang

doi:10.1007/978-3-030-51834-9_85

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…This sample’s oxide scales can be classified into three distinct regions, including an outermost layer of Co 3 O 4 and TiN, a middle oxidation zone containing continuous Al 2 O 3 , TiO 2 , and TiTaO 4 layer, and an internal oxidation zone of dispersing precipitates of Al 2 O 3 . The formation of the TiTaO 4 phase was already observed by Zhuang et al [ 17 ] and Gao et al [ 31 ]. Furthermore, there are some white precipitates in the middle oxidation.…”

Section: Resultsmentioning

confidence: 58%

“…Some results show that the alloy containing Ti and Ta forms a TiTaO 4 layer compound between TiO 2 and internal oxide Al 2 O 3 , and TiTaO 4 is rutile-type oxide [ 32 ]. A continuous TiTaO 4 oxides layer is observed beneath the Cr 2 O 3 layers in both the 3Cr and 5Cr alloys, and they are more likely to form above the discontinuous Al 2 O 3 particles [ 17 ], indicating that the continuous alumina layer and chromium oxide layer contribute to the formation of the TiTaO 4 layer. Meanwhile, the formation of a continuous TiTaO 4 layer on top of the dense Cr 2 O 3 layer can improve oxidation resistance even further.…”

Section: Resultsmentioning

confidence: 99%

“…So far, very little research is available for the CoNi-based superalloy systems. Zhuang et al [ 17 ] have investigated the oxidation of Co-30Ni-(6-8)Al-3W-1Ta-(3-6)Ti-(12-14)Cr, and the effects of Al, Ti, and Cr were discussed. Li et al [ 15 ] discussed the effect of Cr on the microstructural stability, oxidation property, and γ’ phase nano-hardness of multi-component CoNi-based superalloys.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Chromium Content on the Oxidation Behavior of a Ta Stabilized γ’-Strengthened Polycrystalline Co-30Ni-10Al-4W-4Ti-2Ta Alloy

Qian

Shu

et al. 2022

Materials

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The high-temperature oxidation behaviors of polycrystalline Co-30Ni-10Al-4W-4Ti-2Ta superalloys with Cr contents ranging from 1 to 5 at.% are characterized at 900 °C to provide benchmark data for the alloy design of the CoNi-based superalloys. The mass gain curves for all three alloys exhibit parabolic growth, and the addition of 5Cr at.% is sufficient to decrease the oxidation rate by two orders of magnitude compared to the Cr-free alloy. Furthermore, cross-sectional findings reveal that these three alloys form qualitatively similar oxide scales composed of an outer oxide layer of Co3O4 and CoAl2O4 phase on top of an Al2O3 scale, following the inner oxide layers of Cr2O3, TiO2, and TiTaO4, and internally oxidized Al2O3 precipitate. The alloy forms a chromium-rich oxide scale as the Cr addition increased, and the concentration of Cr in the scale/alloy interface increases, promoting the growth of Cr2O3, while CoAl2O4 and Co3O4 nucleation is inhibited. The results further indicate that Cr has a superior effect on improving the oxidation resistance of CoNi-based alloys and that a higher content of Cr can assist the formation of a continuous Al2O3, Cr2O3, and TiTaO4 layers, which in turn hampers outer Co and Ni, and inward oxygen flux.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Chromium Content on the Oxidation Behavior of a Ta Stabilized γ’-Strengthened Polycrystalline Co-30Ni-10Al-4W-4Ti-2Ta Alloy

Qian

Shu

et al. 2022

Materials

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Data‐Driven “Cross‐Component” Design and Optimization of γ′‐Strengthened Co‐Based Superalloys

Zou

Zhang

et al. 2023

Adv Eng Mater

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The discovery of ordered γ 0 precipitates in the system of Co-Al-W-based alloys paves a new pathway for the development of hightemperature superalloys applied at high temperatures. [1,2] Compared to the widely used Ni-based superalloys, the potential for higher temperature capability is expected with Co-based superalloys due to the higher melting temperature of the major matrix component, Co. [3,4] This is very attractive for hot-end components in advanced aeroengines to further improve the fuel efficiency and mechanical properties. In addition, Co-based superalloys usually have a higher sulfide melting temperature than Ni-based superalloys, which is beneficial for the long-term service in an environment containing sulfur, such as industrial gas turbines. [4] However, due to the complexity of the actual service environment, commercial superalloys need to fulfill a variety of physical and chemical properties simultaneously, such as creep, fatigue, oxidation, corrosion, and density, which is done by tailoring the alloy composition typically comprising more than nine components. [5] Until now, the research of γ 0 -strengthened Co-based superalloys has gradually evolved from exploring alloying principles, considering individual or multiple elements, [6][7][8] to the optimization of different properties in an alloy with complex components (≥7). [9][10][11] Many researchers have demonstrated that Ni addition can significantly expand the γ þ γ 0 phase region, [12,13] which contributes to the tailoring of the microstructure by the addition of other refractory elements. Thus, a series of CoNi-based superalloys have been developed in recent years. Ta, Ti, and Nb improve the γ 0 solvus temperature (T γ 0 ) and the temperature capability, [14][15][16] while they also promote the precipitation of TCP phases, which are harmful to mechanical properties. [17,18] Cr is beneficial for improving the oxidation and corrosion resistance, but it reduces the T γ 0 and area fraction of γ 0 precipitates (A γ 0 ). [19,20] Mo, W, and Re provide good solid solution strengthening effects in Ni-based superalloys with a negative misfit (a γ 0 < a γ ). In contrast, Mo lowers the misfit of γ 0 -strengthened Co-based superalloys, which generally exhibit a positive misfit (a γ 0 > a γ ), by increasing the lattice constant of the γ matrix. This normally results in a transition of the γ 0 precipitate morphology from cuboidal to spherical, [21] which is beneficial for the microstructural stability during the long-term service process. W is the γ 0 -forming element in γ 0 -strengthened Co-based superalloys, [22] and its solution effect is lower than that in Ni-based superalloys. Moreover, the addition of W will greatly increase the density. Although Re can significantly improve the creep resistance of Ni-based superalloys by strongly

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High-temperature oxidation behavior of a single-crystal high-entropy superalloy strengthened by dense intermetallic nanoparticles

Xiao,

Ju,

Liu

et al. 2023

Sci. China Mater.

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Effects of Al, Cr, and Ti on the Oxidation Behaviors of Multi-component γ/γʹ CoNi-Based Superalloys

Cited by 4 publications

References 28 publications

Effect of Chromium Content on the Oxidation Behavior of a Ta Stabilized γ’-Strengthened Polycrystalline Co-30Ni-10Al-4W-4Ti-2Ta Alloy

Effect of Chromium Content on the Oxidation Behavior of a Ta Stabilized γ’-Strengthened Polycrystalline Co-30Ni-10Al-4W-4Ti-2Ta Alloy

Data‐Driven “Cross‐Component” Design and Optimization of γ′‐Strengthened Co‐Based Superalloys

High-temperature oxidation behavior of a single-crystal high-entropy superalloy strengthened by dense intermetallic nanoparticles

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