The role of aluminum and titanium on the oxidation process of a nickel-base superalloy in steam at 800�C

Abe, Fujio; Araki, Hiroshi; Yoshida, Heitaro; Okada, Masatoshi

doi:10.1007/bf00656727

Cited by 66 publications

(26 citation statements)

References 9 publications

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“…When the samples tested in the gases with 0.25vol% SO 2 , No Sulphur was detected by the EDS. Actually, at high temperatures SO 2 could lead corrosion of some metals according to reaction (1). If the suphur partial pressure was low enough, sulfides were instability, which would led to sulfides displace or decompose.…”

Section: Discussionmentioning

confidence: 99%

High temperature corrosion behavior of superalloy GH984G in synthetic flue gases environments

Liu¹,

Ren²,

Liang³

et al. 2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

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KEYWORD: USC boiler; GH984G; high temperature corrosion; flue gas ABSTRACT: High temperature corrosion behavior of Ni-Fe-based Superalloy GH984G was studied in the synthetic flue gas environments with different SO2 concentration at 800˚C. The microstructure and composition of the scales were investigated by scanning electron microscope/energy dispersive spectroscope and X-ray diffraction. The Cr2O3-rich scale with a mount of TiO2 formed on the sample surface. With the SO2 increasing, corrosion became serious and more TiO2 was detected in the scale. Sulfides could be detected even the SO2 concentration decreased to 0.5%.

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Section: Discussionmentioning

confidence: 99%

High temperature corrosion behavior of superalloy GH984G in synthetic flue gases environments

Liu¹,

Ren²,

Liang³

et al. 2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

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show abstract

“…, can be also described by parabolic laws [3,4]. With the modified composition profiles from step 1, diffusion by the homogenization model was run through the whole material in step 2.…”

Section: Matec Web Of Conferencesmentioning

confidence: 99%

“…5 is porous, oxygen and nitrogen can easily diffuse into the superalloy matrix, resulting in internal oxidation and nitridation [2,3]. By removing the oxidized and nitridized Cr, Al Ti in zone I, II and/or III in the model, to simulate the oxidation and nitridation, the elemental activity in metallic phases (γ / γ ) in the alloy is changed locally, which drives the homogenization diffusion of the alloying elements through the superalloy.…”

Section: Microstructure Degradationmentioning

confidence: 99%

“…Most superalloys can not form a dense and protective oxide layer at high temperature so the inner microstructure of the superalloy, typically consisting of γ /γ phases, will be degraded due to internal oxidation and nitridation [1][2][3]. The degradation of the microstructure can happen near the superalloy surface or along a surfaceconnecting crack.…”

Section: Introductionmentioning

confidence: 99%

“…Common oxides/nitrides in superalloys are, for instance, alumina, AlN and TiN [2,3]. The penetration depths of the oxides and nitrides are thermodynamically dependent upon the forming energy of the oxides/nitrides, and kinetically upon the solution and diffusivity of oxygen/nitrogen and the alloying elements in the material [3,4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of oxidation-nitridation-induced microstructural degradation in a cracked Ni-based superalloy at high temperature

Yuan

Peng

et al. 2014

MATEC Web of Conferences

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Abstract. In turbine engines, high temperature components made of superalloys may crack in a creep process during service. With the inward flux of the gases, e.g. oxygen and nitrogen, along those cracks, the microstructure of the superalloy substrate nearby the cracks may degrade by internal oxidation and nitridation. The aim of this study is to investigate and simulate the oxidation-nitridation-induced microstructural degradation in superalloys by taking a variant of Ni-based superalloy IN-792 as a sample. After the creep testing of the superalloy in air, the microstructures on the cross section of the superalloy were analysed in a scanning electron microscope, equipped with energy/wavelength dispersive systems. Internal oxidation and nitridation, presenting by Al/Ti oxides and nitrides, were observed under a porous and even cracked Cr-oxide scale which was formed on the superalloy surface or along the creep cracks connecting the superalloy surface. Meanwhile, the reinforcing γ precipitates were depleted. Such oxidation-nitridation-induced microstructural degradation was simulated by using an oxidation-diffusion model, focusing the diffusion of the alloying elements in metallic phases of the superalloy.

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Effects of Al on Coherent γ′, Lattice Misfit of γ′/γ and Stress‐Rupture Property of Nimonic 80A

Shen

Liu

et al. 2014

Energy Materials 2014

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The role of aluminum and titanium on the oxidation process of a nickel-base superalloy in steam at 800�C

Cited by 66 publications

References 9 publications

High temperature corrosion behavior of superalloy GH984G in synthetic flue gases environments

High temperature corrosion behavior of superalloy GH984G in synthetic flue gases environments

Simulation of oxidation-nitridation-induced microstructural degradation in a cracked Ni-based superalloy at high temperature

Effects of Al on Coherent γ′, Lattice Misfit of γ′/γ and Stress‐Rupture Property of Nimonic 80A

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