Oxidation behavior of high Hf nickel-based superalloy in air at 900, 1000 and 1100°C

Xiao, Jingzhong; Xiong, Ying; Wang, Li; Jiang, Xiangwei; Wang, Dong; Li, Kaiwen; Dong, Jianshu; Lou, Langhong

doi:10.1007/s12613-020-2204-z

Cited by 17 publications

(4 citation statements)

References 40 publications

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“…It is suggested that Class A regions correspond to the β phase and γ′-envelope regions. Previous research has demonstrated that HfO2 is predominantly located at the interface, facilitating the rapid formation of Al2O3, anchoring the interface and enhancing the adhesion of oxide film [47][48][49]. Thus, it can be deduced that Class B regions correspond to the (γ + γ′) dendrite regions.…”

Section: Growth Behavior Of Long-term Cyclic Oxidation Productsmentioning

confidence: 99%

“…Combined with the XRD results (Figure 11), it is evident that the deep oxidation region is primarily composed of HfO 2 which is surrounded by Al 2 O 3 which corresponds to HfO 2 near Al 2 O 3 in Class A regions of the oxidized surface (Figure 10), suggesting that the oxidations in deep regions are primarily the result of HfO 2 formed near the γ ′ -envelope. It has been proved that HfO 2 enhances the adhesion of oxide films [47][48][49], while excessive oxide growth near HfO 2 can increase the risk of spalling of oxidized products. Hence, it can be concluded that a well-dispersed HfO 2 in the 5% pre-strained alloy is more beneficial for enhancing the cohesiveness of the oxide film.…”

Section: Growth Behavior Of Long-term Cyclic Oxidation Productsmentioning

confidence: 99%

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Oxidation Behavior of Pre-Strained Polycrystalline Ni3Al-Based Superalloy

Guo,

Ding,

Wang

et al. 2024

Materials

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The harsh service environment of aeroengine hot-end components requires superalloys possessing excellent antioxidant properties. This study investigated the effect of pre-strain on the oxidation behavior of polycrystalline Ni3Al-based superalloys. The growth behaviors of oxidation products were analyzed by scanning electron microscope, transmission electron microscope, X-ray Photoelectron Spectroscopy and Raman spectroscopy. The results indicated that the 5% pre-strained alloys exhibited lower mass gain, shallower oxidation depth and more compact oxide film structures compared to the original alloy. This is mainly attributed to the formation of rapid diffusion paths for Al atoms diffusing to the surface under 5% pre-strain, which promotes the faster formation of protective Al2O3 film while continuing to increase the pre-strain to 25% results in less protective transient oxidation behavior being aggravated due to the increase in dislocation density within the alloy, which prevents the timely formation of the protective Al2O3 film, resulting in uneven oxidation behavior on the alloy.

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Section: Growth Behavior Of Long-term Cyclic Oxidation Productsmentioning

confidence: 99%

Section: Growth Behavior Of Long-term Cyclic Oxidation Productsmentioning

confidence: 99%

Oxidation Behavior of Pre-Strained Polycrystalline Ni3Al-Based Superalloy

Guo,

Ding,

Wang

et al. 2024

Materials

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“…Recycled superalloys introduce non-metallic inclusions (such as oxides or nitrides), and random inclusions can lead to an uneven microstructure in the material, generally resulting in a performance inferior to that of the original superalloy [3,4]. During the recycling of superalloys containing Hf, it is common to introduce HfO 2 inclusions [5,6]. These non-metallic inclusions contribute to the reduced mechanical performance of superalloys, influencing the nucleation and propagation of cracks under tension or fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pre-Added HfO2 Inclusions on Carbide Morphology and Deformation Behavior in DZ125 Nickel-Based Superalloy

Feng,

Liu,

Wang

et al. 2024

Metals

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Inclusions are important phases affecting material properties in complicated ways. In this paper, a quantitative study of the addition of HfO2 inclusions to DZ125 nickel-based superalloys was performed. Experimental results showed that the introduction of HfO2 inclusions caused a loss of strength and ductility. The carbide morphology also changed significantly from skeletal-shaped to block-shaped, resulting in a remarkable discrepancy in the fracture behavior under quasi-in-situ tensile testing. The SEM dynamic observations showed that cracks were initiated from the skeletal carbides and almost failed to propagate into the matrix. In contrast, the damage behavior of block-shaped carbides also involved internal cracking but with a tendency to form interconnected microcracks during propagation. A crystal plasticity finite element model (CPFEM) method was further developed to study the stress/strain behavior during the deformation process, considering the crystal orientations and microstructure morphologies from the EBSD data. Those elastoplastic parameters were determined through nanoindentation experiments. Simulation results verified that blocky carbides produced a pronounced strain concentration at the interface of the carbides and matrix, thereby increasing the tendency of crack formation. This paper provides a fundamental understanding of the role of inclusions in material recycling applications.

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“…The alloys with added Hf element not only show good oxidation resistance at 900°C-1000°C, at the same time, HfC is beneficial to the improvement of the creep properties of the alloys. However, because of the cost, the alloy composition with a large amount of Hf added has no practical value (Xiao et al, 2021;Berthod et al, 2021aBerthod et al, , 2021b.…”

Section: Introductionmentioning

confidence: 99%

Effects of trace elements Hf and Si on oxidation behavior of Co-Ni-Al-W-based superalloys at 900°C

Zhou

Zhang

et al. 2022

ACMM

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Purpose This study aims to control the oxidation resistance of Co-based deformed superalloys by adding trace elements Hf and Si. Design/methodology/approach The effects and mechanism of trace elements Hf and Si on the oxidation behavior of Co-Ni-Al-W-based forged superalloys were investigated by cyclic oxidation at 900°C. Findings The results show that the addition of trace elements Hf and Si does not affect the type of surface oxides of Co-Ni-based superalloys, and the oxidation layers of the alloys are TiO2, spinel, Cr2O3, TaTiO4, Al2O3 and TiN from outside to inside. However, the addition of elements can affect the activity of Cr and Ti elements; decrease the formation of TiO2 and TaTiO4 layers, which are harmful to the oxidation performance; and then improve the oxidation resistance of the alloy. Originality/value The relevant research results can not only optimize the microalloying element content of Co-Ni-Al-W-based superalloys, but also provide a new perspective for the composition optimization design of superalloys.

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Oxidation behavior of high Hf nickel-based superalloy in air at 900, 1000 and 1100°C

Cited by 17 publications

References 40 publications

Oxidation Behavior of Pre-Strained Polycrystalline Ni3Al-Based Superalloy

Oxidation Behavior of Pre-Strained Polycrystalline Ni3Al-Based Superalloy

Effect of Pre-Added HfO2 Inclusions on Carbide Morphology and Deformation Behavior in DZ125 Nickel-Based Superalloy

Effects of trace elements Hf and Si on oxidation behavior of Co-Ni-Al-W-based superalloys at 900°C

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