AES and SAM studies of oxide formation on Inconel 600 at high temperatures

Alstrup, N. C.; Langvad, N.; Chorkendorff, Ib

doi:10.1002/sia.740220194

Cited by 11 publications

(7 citation statements)

References 9 publications

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“…In contrast, these Ni-enriched nodules are absent in the oxide layer of the sample fired at 950°C, where the presence of voids and defects is more evident with respect to the Nimonic 80 A fired at the lower temperature. It is worth noting that Alstrup et al, 9 on oxidized Inconel 600 nickel-based superalloy, and McIntyre et al, 13 on Ni-18wt.% Cr fired at 600°C, have noted the formation of these small nickel-rich oxide nodules during the initial oxidation stage in association with surface defects.…”

Section: Resultsmentioning

confidence: 95%

“…2,8 In this work, the use of GDOES combined with scanning electron microscopy with energy-dispersive spectrometry (SEM C EDS) and x-ray diffraction (XRD) has been extended to analysis of the oxide layer grown in air at high temperature (up to 950°C) on polycrystalline Nimonic 80 A (N 80 A) nickel-based superalloy. This material is used for manufacturing jet and diesel engine components whose highest working temperature could be close to ¾1000°C and in the power and chemical industries 9 for many applications that require both mechanical strength and oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

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Combined use of GDOES and SEM + EDS for the microchemical study of oxide layers grown at high temperature on Nimonic 80 A nickel‐based superalloy

Ingo

Angelini

Calliari

et al. 2002

Surface & Interface Analysis

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The microchemical structure of the oxide scale grown on a polycrystalline Nimonic 80 A nickel-based superalloy as a function of the air high-temperature treatment (up to 950• C) has been studied by means of the combined use of glow discharge optical emission spectrometry (GDOES), scanning electron microscopy with energy-dispersive spectrometry (SEM + EDS) and x-ray diffraction (XRD). The results disclose the morphology, the microchemical structure and the in-depth elemental chemical composition of the oxide layers and their variation as a function of the temperature of the air thermal treatment. Furthermore, GDOES, SEM + EDS and XRD results show the different oxidation behaviours of both main alloying and minor reactive elements that induce the formation of a stratified oxide structure.

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Combined use of GDOES and SEM + EDS for the microchemical study of oxide layers grown at high temperature on Nimonic 80 A nickel‐based superalloy

Ingo

Angelini

Calliari

et al. 2002

Surface & Interface Analysis

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“…Only a limited number of studies have examined the isothermal and cyclic oxidation behavior of the IN600 superalloy [12][13][14][15]. IN600 has shown a very good oxidation resistance when exposed to isothermal and cyclic oxidation in air at temperatures below 1000°C.…”

Section: Introductionmentioning

confidence: 99%

Cyclic Oxidation Kinetics and Oxide Scale Morphologies Developed on the IN600 Superalloy

et al. 2011

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The oxidation behavior of the IN600 Ni-Cr-Fe superalloy was investigated in air at temperatures ranging from 750 to 950°C, for up to 12 cycles. Oxidation kinetics and oxide scale morphologies were examined using weight gain measurements, SEM-EDS, and X-ray diffraction. The cyclic oxidation kinetic results suggested that the oxidation behavior of the IN600 alloy approximately followed a sub-parabolic rate and the scaling process was controlled by the formation of a chromia scale. At 850°C, SEM-EDS observations indicated that the formed oxide scale was primarily composed of Cr 2 O 3 , and the internal oxidation of Cr and Ti occurred. At 950°C, a fast initial stage with high weight gain was observed, followed by a steady-state stage with gradual weight gain. Additionally, a considerable change in the oxidation kinetic occurred. SEM-EDS observations and XRD results indicated that the external scale was relatively thick with a localized porous, preferential adherent, and a complex oxide scale was developed. This complex oxide scale consisted of an outermost thin layer composed of MnCr 2 O 4 -Cr 2 O 3 mixed together with a small amount of isolated TiO 2 , an intermediate relatively thick layer, composed of Cr 2 O 3 , and an innermost discrete layer formed at the scale/ alloy interface, which enriched by Ni/NiO mixed with Ti-, Al-, and Fe-oxides. Finally, only the Al alloying element was internally oxidized to form Al 2 O 3 fingers, which create a discrete and narrow internal oxidation zone. Al oxide was observed as a dark area and primarily grows along the alloy grain boundaries in the vicinity of the inward chromia pegs.

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“…It is also the primary constituent of passive films protecting stainless steels and other high performance industrial alloys [4][5][6]. Moreover, the surface is used in industry to catalyze the conversion of para-to orthohydrogen [7].…”

Section: Introductionmentioning

confidence: 99%

“…Chromium oxide is useful as a catalyst in many applications including internal combustion engine emission technology [1] and the dehydrogenation of alkanes [2,3]. It is also the primary constituent of passive films protecting stainless steels and other high performance industrial alloys [4][5][6]. Moreover, the surface is used in industry to catalyze the conversion of para-to orthohydrogen [7].…”

Section: Introductionmentioning

confidence: 99%

Ab Initio Study of Magnetic Structure and Chemical Reactivity of Cr₂O₃ and Its (0001) Surface

2000

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We present the first ab initio density functional theory study of the oxygen-terminated Cr2O3 (0001) surface within the local spin-density approximation (LSDA). We find that spin plays a critical role for even the most basic properties of Cr2O3 such as the structure and mechanical response of the bulk material. The surface exhibits strong relaxations and changes in electronic and magnetic structure with important implications for the chemical reactivity and unusual spin-dependent catalytic activity of the surface. Unlike the bulk, the outermost chromium bilayer is ferromagnetically ordered, and the surface oxygen layer exhibits appreciable net spin polarization in the opposite sense. Surprisingly, despite this ferrimagnetic order, the chemically important states near the Fermi level exhibit ferromagnetic order and thus favor electronic spin alignment of species interacting with the surface. Finally, we also find a high density of unoccupied electronic surface states available to participate in the chemical reactivity of the surface.

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AES and SAM studies of oxide formation on Inconel 600 at high temperatures

Cited by 11 publications

References 9 publications

Combined use of GDOES and SEM + EDS for the microchemical study of oxide layers grown at high temperature on Nimonic 80 A nickel‐based superalloy

Combined use of GDOES and SEM + EDS for the microchemical study of oxide layers grown at high temperature on Nimonic 80 A nickel‐based superalloy

Cyclic Oxidation Kinetics and Oxide Scale Morphologies Developed on the IN600 Superalloy

Ab Initio Study of Magnetic Structure and Chemical Reactivity of Cr₂O₃ and Its (0001) Surface

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AES and SAM studies of oxide formation on Inconel 600 at high temperatures

Cited by 11 publications

References 9 publications

Combined use of GDOES and SEM + EDS for the microchemical study of oxide layers grown at high temperature on Nimonic 80 A nickel‐based superalloy

Combined use of GDOES and SEM + EDS for the microchemical study of oxide layers grown at high temperature on Nimonic 80 A nickel‐based superalloy

Cyclic Oxidation Kinetics and Oxide Scale Morphologies Developed on the IN600 Superalloy

Ab Initio Study of Magnetic Structure and Chemical Reactivity of Cr2O3 and Its (0001) Surface

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Ab Initio Study of Magnetic Structure and Chemical Reactivity of Cr₂O₃ and Its (0001) Surface