Effects of composition and particle size on the surface state and degassing behavior of nickel-based superalloy powders

Qiang, Zhang; Zheng, Liang; Yuan, Hua; Li, Zhou; Zhang, Guoqing; Xie, Jun

doi:10.1016/j.apsusc.2021.149793

Cited by 19 publications

(2 citation statements)

References 39 publications

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“…Finally, H content is higher only for powders below 20 µm. This trend can be probably explained considering that finest particles have a higher tendency to form a thin Ni(OH) 2 layer due to their more elevated specific surface [18,19].…”

Section: C S O N and H Content As A Function Of Particles Sizementioning

confidence: 98%

Effect of the particle size distribution on physical properties, composition, and quality of gas atomized Astroloy powders for HIP application

Bassini

Napal

Biurrun

et al. 2022

Journal of Alloys and Compounds

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Section: C S O N and H Content As A Function Of Particles Sizementioning

confidence: 98%

Effect of the particle size distribution on physical properties, composition, and quality of gas atomized Astroloy powders for HIP application

Bassini

Napal

Biurrun

et al. 2022

Journal of Alloys and Compounds

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“…Therefore, powders surface characterization lay the foundation to clarify the mechanism of PPB and further optimize the microstructure. Previous studies have been carried out to address the powders surface microstructure, oxidation characteristics, chemical state, degassing behavior [19][20][21][22][23][24] . So far, little research has been published on surface precipitate analysis of Ni-base superalloy powders.…”

Section: Introductionmentioning

confidence: 99%

Surface precipitate analysis of gas atomized Ni-Base superalloy powders

Liu,

Zhang,

et al. 2023

J. Phys.: Conf. Ser.

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Powders surface precipitate has strong relations with the microstructure and properties of powder metallurgy components. Morphology, element distribution and crystal structure of the precipitate at gas atomized Ni-base superalloy powders surface were investigated. Results show that the precipitate is lamelliform and prefers to form at grain boundaries and interdendrite regions than dendrite arms. With powders size decreasing, the precipitate shape observed from surface varies from strip to rectangular and to nearly round, and the precipitate density increases, measured 17.75 μm−2, 21.42 μm−2, 26.50 μm−2 at nearly 45μm, 30μm and 10μm powders surface respectively, but the precipitate average size changes conversely, that is 228nm, 193nm, 77nm respectively. The precipitate enriches in high melting point elements Ti, Nb, Mo, W, Zr and poor in low melting point elements Ni, Cr, Co, Al. Crystal structure analysis reveals that the precipitate is MC, M23C6 or M6C carbide.

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Influence of Storage Conditions on Powder Surface State and Hot Deformation Behavior of a Powder Metallurgy Nickel‐Based Superalloy

et al. 2022

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Powder metallurgy (PM) FGH96 superalloy powders are stored under vacuum, argon, ambient air, and oxygen atmospheres for as long as 500 days. The surface analysis results demonstrate that the chemical state of Ni, Ti, Cr, Co, O, and C remain unchanged after 90 days storage. However, the oxygen content and NiO/Ni(OH)2 layer thickness increase from initial values (∼120 ppm and ∼3.8 nm) to stabilized values (∼200 ppm and ∼10 nm) after a short time storage (7–15 days), and remain basically unchanged with the extension of storage time. Powders stored in oxygen atmosphere possess the highest oxygen content (maximum 213 ppm) while the lowest in vacuum, the gap can reach to 25 ppm. The hot isostatic‐pressed (HIPed) parts that consolidated from original and stored powders are isothermally compressed at different conditions. The results indicate that HIPed parts with more oxygen will cause higher activation energy and narrower processing window due to a lower degree of dynamic recrystallization (DRX). Discontinuous DRX (DDRX) dominates the DRX nucleation mechanism of HIPed FGH96 superalloys with ∼120–200 ppm oxygen content, while continuous DRX (CDRX) is the auxiliary mechanism. The increased oxygen content and surface NiO/Ni(OH)2 layer thickness of superalloy powders generate higher oxygen content of corresponding HIPed parts, thus decreasing the hot workability.

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Effects of composition and particle size on the surface state and degassing behavior of nickel-based superalloy powders

Cited by 19 publications

References 39 publications

Effect of the particle size distribution on physical properties, composition, and quality of gas atomized Astroloy powders for HIP application

Effect of the particle size distribution on physical properties, composition, and quality of gas atomized Astroloy powders for HIP application

Surface precipitate analysis of gas atomized Ni-Base superalloy powders

Influence of Storage Conditions on Powder Surface State and Hot Deformation Behavior of a Powder Metallurgy Nickel‐Based Superalloy

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