Precipitation Behavior of σ-FeCr Phases in Hastelloy C-2000 Superalloy Under Plastic Deformation and Aging Treatment

Yuan, Lang; Hu, Rui; Zhang, Tiebang; Yan, Han; Xue, Xu; Li, Jinshan

doi:10.1007/s11665-014-1351-7

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…Coatings protect against surface cracking, heat flux loading, cyclic fatigue, and compressor erosion. A larger aluminum content produces aluminum oxide, an additional layer of protection that significantly boosts resistance to oxidation at high temperatures [14]. Coatings help avoid surface erosion, corrosion, and tribo-corrosion at higher operating temperatures.…”

Section: Introductionmentioning

confidence: 99%

Investigations into Power Plant Alloys’ (Inconel 718) Oxidation Resistance by Compound Composite (Cr2O3 + YSZ) Coatings

et al. 2023

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As it increases the pressure and temperature of incoming steam and decreases CO2 emissions, oxidation is crucial for materials used in power plants to increase their efficiency. Compound composite (Cr2O3 + YSZ) coatings applied to Inconel 718 (EN8) substrates using the Atmosphere Plasma Spray technique are anticipated to increase structural resistance when subjected to high pressure and temperature oxidation conditions of service. The nickel-based superalloys EN8 and EN8/Yttria (8% Y2O3) Stabilized Zirconia (YSZ)/Cr2O3 were subjected to high-temperature oxidation tests in the open air at 1050 °C for approximately 12, 24, 48, and 100 h. EN8 is not appropriate for prolonged use at 1050 °C as can be seen from scanned electron microscope and energy dispersive X-ray spectroscopy analyses on isothermally oxidized samples. The findings demonstrated that the EN8 alloy exhibited more significant weight variations over 48 h at high temperatures because its chromia oxide scale was continuously smaller. With phase dispersion in the microstructure, coated EN8 exhibits a higher performance under more prolonged exposure than the EN8 alloy. Additionally, the synthesis of outer chromium oxide, YSZ, and Cr2O3 on a substrate at 1050 °C for 100 h improved the outstanding oxidation resistance while maintaining the integrity of the chromium oxide layer.

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Section: Introductionmentioning

confidence: 99%

Investigations into Power Plant Alloys’ (Inconel 718) Oxidation Resistance by Compound Composite (Cr2O3 + YSZ) Coatings

et al. 2023

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“…Commercial Alloy 625 usually contains 2-5% wt Fe and Fe atoms are present in the matrix in solid solution. The Topological Close-Packed Phase such as Laves phase, phase, and phase [15], as shown in Table 1, will be precipitated in the long aging. These phases are plate-shaped or needle-shaped, leading to the reduction of fracture strength and plasticity [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aging Treatment on Intergranular Corrosion Properties of Ultra-Low Iron 625 Alloy

Zhu

Sui

Dai

et al. 2019

International Journal of Corrosion

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The microstructures evolution of precipitations for an ultra-low iron Alloy 625 subjected to long term aging treatment at 750°C was investigated using scanning electron microscope (SEM) and X-ray diffraction (XRD). The intergranular corrosion behaviors of Alloy 625 were evaluated by using ASTM G28A. The result shows that the precipitated phase γ′′-Ni3Nb was mainly precipitated at the grain boundaries and twin boundaries. The number and volume fraction of γ′′ increased with the prolonging of aging time. The transformation of γ′′ to δ-Ni3Nb occurred after aging periods of 200 h. The corrosion resistance of Alloy 625 was significantly reduced during aging treatment. The decrease in intergranular corrosion resistance of Alloy 625 was attributed to the dissolution of precipitated phase and chromium depleted zone. The mass loss rate of Alloy 625 after aging treatment is related to the volume of precipitated phase and can be simulated by Johnson-Mehl-Avrami equation.

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“…In present study, Alloy 625 (ASTM B446) contains 2-5%wt Fe, which can solution strengthen basal body to increase strength. However, there is Topological Close-Packed Phase in long term aging, such as Laves phase, μ phase and σ phase [8,16]. As shows in Table 1, it is board-like or needle-like shape, which decreases alloy's breakage strength and ductility [8,17].…”

mentioning

confidence: 99%

Long Term Aging Treatment Impact on Ultralow Iron Alloy 625 Intergranular Corrosion Property

Zhu¹,

Sui²,

Dai³

et al. 2017

Preprint

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This paper investigates the evolution of microstructures and precipitations of an ultra-low iron alloy 625 subjected to long term aging treatment by scanning electron microscope (SEM) and X-ray diffraction(XRD). Use ASTM G28A acid Fe3(SO4)2 erosion to represent intergranular corrosion weightlessness and corrosive morphology. The result shows that alloy at 750°C by aging treatment for 40h, precipitated γ'' phase in the grain boundary. In high density area of γ'' phase, occurs γ'' phase to δ phase degeneration transformation by aging treatment for 200h and the needle-like δ phase becomes more with time prolonged. And γ'' phase degenerated to δ phase completely until treated for 1000h. The sample which has aging treatment tends to have intergranular corrosion and mainly because alloy element spreading leads to dilution area and grain boundary precipitated phase, plus interlaced δ phase's dissolving, which makes sample grain particle fall off and this results in apparent weightlessness. The weightlessness rate(WLR) is related with precipitated volume score. With aging sensitization time change, can be described by Johnson-Mehl-Avrami equation, i.e.: = 44.32 1 − exp (− . ) + 44.62 1 − exp (− . ) + 1.267 ( / ).

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Precipitation Behavior of σ-FeCr Phases in Hastelloy C-2000 Superalloy Under Plastic Deformation and Aging Treatment

Cited by 4 publications

References 28 publications

Investigations into Power Plant Alloys’ (Inconel 718) Oxidation Resistance by Compound Composite (Cr2O3 + YSZ) Coatings

Investigations into Power Plant Alloys’ (Inconel 718) Oxidation Resistance by Compound Composite (Cr2O3 + YSZ) Coatings

Effect of Aging Treatment on Intergranular Corrosion Properties of Ultra-Low Iron 625 Alloy

Long Term Aging Treatment Impact on Ultralow Iron Alloy 625 Intergranular Corrosion Property

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