The effect of isothermal aging on creep behavior of modified 2.5Al alumina-forming austenitic steel

Jiang, Jundong; Liu, Ziyun; Gao, Qiuzhi; Zhang, Hailian; Hao, Aimin; Qu, Fu; Lin, Xiaoping; Li, Huijun

doi:10.1016/j.msea.2020.140219

Cited by 32 publications

(13 citation statements)

References 38 publications

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“…[9,16,17] Hence, Co-Ni-Al-based superalloys with composition (at%) of 28-35 Ni, 6-9 Al, 2-3 Ti, 2-3 Cr, or Mo are proposed by some researchers. [12,18] Our previous work has also confirmed that the addition of 2 at% Cr or Mo in Co-Ni-Al-based superalloys would increase the volume fraction and average size of γʹ phase during aging treatment. [12,19] The oxidation resistance of Co-based superalloys, which are applied to high-temperature components manufacturing also needs to be focused on during alloying elements adjustment.…”

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confidence: 59%

“…[12,18] Our previous work has also confirmed that the addition of 2 at% Cr or Mo in Co-Ni-Al-based superalloys would increase the volume fraction and average size of γʹ phase during aging treatment. [12,19] The oxidation resistance of Co-based superalloys, which are applied to high-temperature components manufacturing also needs to be focused on during alloying elements adjustment. Generally, both Al and Cr are considered as the largest contribution elements to anti-oxidation designing.…”

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confidence: 59%

“…Ni generally exhibits irreplaceable importance in stabilizing the γ/γ' structure of Co-based superalloys. [12,13] In addition, stabilizing strengthening L1 2γ' precipitates could be formed by adding up to 30 at% Ni in Co-Al alloys and the γ/γ' two-phase region can be enlarged by increasing the Ni content. [14] An appropriate content (about 2-5 at%) of Mo to stabilize γ' precipitates in Co-based superalloys is also a favorable alloying method.…”

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confidence: 99%

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Isothermal oxidation behavior of W‐free Co–Ni–Al‐based superalloy at high temperature

Gao

Shang

et al. 2021

Materials & Corrosion

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Co‐based superalloys with the advantages of high melting point, high‐temperature mechanical properties, and large resistance under hot corrosion environment are potential candidates for turbine engine components. The isothermal oxidation behavior of Co–Ni–Al‐based superalloy with the addition of Mo and Cr in dry air at 1073 and 1173 K was investigated. The results showed that similar three‐layer oxides structures were composed of Co‐containing oxides, complex oxides rich in Co and Al, and Al2O3 layer formed on both 2Mo and 2Cr Co–Ni–Al‐based superalloys, and Mo‐containing oxides also existed in the subsurface. The oxides in the outer layer transferred from Co3O4 to denser CoO with the increase in temperature. The γ'‐free zone formed under the Al2O3 layer due to the depletion of Al. Co–Ni–Al‐based superalloys need to conquer a large energy barrier at an earlier stage of oxidation and exhibit good oxidation resistance at 1073 K.

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confidence: 59%

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confidence: 59%

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confidence: 99%

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Isothermal oxidation behavior of W‐free Co–Ni–Al‐based superalloy at high temperature

Gao

Shang

et al. 2021

Materials & Corrosion

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“…Additionally, the solution annealing effectively increased the matrix Ti content and resulted in improvement in the creep rupture life ( Figure 5 and Figure 7 ). In addition, the increased matrix Nb content after solution annealing stabilized the fine Laves phases ( Figure 9 ), which provides additional creep resistance [ 19 ]. Nevertheless, no direct correlation between Ti content and creep rupture life could be obtained for 35Ni–(2~4)Ti alloys in the solution annealed condition ( Figure 7 ).…”

Section: Discussionmentioning

confidence: 99%

“…The Fe-Ni-based alumina-forming alloys with a compositional range of (20~32)Ni–(2~4)Al (wt%) provide the formation of a protective alumina (Al 2 O 3 ) layer in the oxidizing environment and show good creep property from γ’-Ni 3 Al precipitates, Laves (Fe 2 Nb) phases, carbides, and B2-NiAl phases [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. It is typically preferable to have higher matrix Al content for the application in the highly oxidizing environments, since it was reported that the gradual depletion of Al in the subsurface for the 3.5 wt% Al alloy resulted in breakaway oxidation during prolonged exposure in the S-CO 2 environment [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti Content on the Microstructure and High-Temperature Creep Property of Cast Fe-Ni-Based Alloys with High-Al Content

et al. 2020

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The cast Fe-Ni-based austenitic heat-resistant alloys with 4.5 wt% Al and varying Ti content were developed for high-temperature application. With increase in Ti content, strength of model alloys increased gradually at 700 °C and 750 °C. At 750 °C, alloys with 35Ni–(2~4)Ti composition showed a significant increase in creep rupture life compared to 30Ni–1Ti alloy, attributed to the increase in γ’-Ni3(Al,Ti) precipitates due to higher Ni and Ti content. Among the 35Ni–(2~4)Ti alloys, increasing Ti content from 2 to 4 wt% gradually increased the creep rupture life in the as-cast condition. The creep rupture life was improved after solution annealing treatment, however, the beneficial effect of higher Ti content was not evident for 35Ni–(2~4)Ti alloys. After solution annealing, interdendritic phases were partially dissolved, but coarse B2-NiAl phases were formed. The size and amount of coarse B2-NiAl phases increased with Ti content. In the creep-tested specimens, creep void nucleation and crack propagation were observed along the coarse B2-NiAl phases, especially for high-Ti alloys. Therefore, the beneficial effect of the increase in γ’-Ni3(Al,Ti) precipitates for high-Ti alloys on creep property was limited due to the detrimental effect of the presence of coarse B2-NiAl phases.

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Effects of Fe/Ni Ratio on Microstructure and Properties of FeNiCrAlNb High‐Entropy Alloys

Zhu

et al. 2023

Adv Eng Mater

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Herein, the effects of Fe/Ni ratio on the microstructure, mechanical properties, and corrosion resistance in a 3.5 wt% NaCl solution of Fe x Ni 65Àx Cr 20 Al 10 Nb 5 are investigated systematically. It is found that the phases shifted from the FCC-dominated to the BCC-dominated with the molar ratio of the Fe/Ni increased. The strength of Fe x Ni 65Àx Cr 20 Al 10 Nb 5 increases with the molar ratio of Fe/Ni further increased, while the plasticity decreases. The yield strength reaches 1,653 MPa at x = 45. The alloy exhibits the best corrosion resistance when x = 35 which is attributed to the dominant FCC phases in the dendritic region.

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The effect of isothermal aging on creep behavior of modified 2.5Al alumina-forming austenitic steel

Cited by 32 publications

References 38 publications

Isothermal oxidation behavior of W‐free Co–Ni–Al‐based superalloy at high temperature

Isothermal oxidation behavior of W‐free Co–Ni–Al‐based superalloy at high temperature

Effect of Ti Content on the Microstructure and High-Temperature Creep Property of Cast Fe-Ni-Based Alloys with High-Al Content

Effects of Fe/Ni Ratio on Microstructure and Properties of FeNiCrAlNb High‐Entropy Alloys

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