Long term oxidation resistance of alloys for gas-cooled reactors

Cabet, C.; Duprey, Brigitte

doi:10.1016/j.nucengdes.2011.11.001

Cited by 15 publications

(6 citation statements)

References 15 publications

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“…Extrapolation of the ! ( ) data to 950°C also agreed well with the surface oxidation rate constant data reported by Cabet and Duprey [3] for Alloy 617 exposed to a multi-component VHTR equivalent environment at 950°C, at much higher flow rates (800 -1600 ml/min) ( Figure 3). Extrapolation of the !…”

Section: Short-term Oxidation Kinetics Of In617 Is Determined As a Fusupporting

confidence: 89%

“…Extrapolation of the ! ( ) values remained greater than the value reported by Cabet and Duprey [3], most probably because the authors reported a combined rate for intergranular and transgranular oxidation.…”

Section: Short-term Oxidation Kinetics Of In617 Is Determined As a Fucontrasting

confidence: 59%

“…Figure 3. Comparison of the measured parabolic rate constants for IN617 surface and intergranular Al oxidation upon exposure to He-CO/CO 2 = 9 (Pco = 13.5 molppm) and He-CO/CO 2 = 1320 (Pco = 1980 molppm) at 750 and 850°C with the data reported by Cabet and Duprey at 950°C [3]. Q values denote the activation energy for surface and intergranular Al oxidation.…”

Section: Discussionmentioning

confidence: 92%

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Corrosion and Creep of Candidate Alloys in High Temperature Helium and Steam Environments for the NGNP

Was¹,

Jones²

2013

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Section: Short-term Oxidation Kinetics Of In617 Is Determined As a Fusupporting

confidence: 89%

Section: Short-term Oxidation Kinetics Of In617 Is Determined As a Fucontrasting

confidence: 59%

Section: Discussionmentioning

confidence: 92%

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Corrosion and Creep of Candidate Alloys in High Temperature Helium and Steam Environments for the NGNP

Was¹,

Jones²

2013

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“…Inconel alloys are considered for use in the primary circuit components, mainly for blades and discs in gas turbines out of the reactor s active zone [9,10]. It was found that in an oxidizing environment, Inconel alloys form a passivating oxide layer, protecting the components from additional corrosion at high temperatures [11]. Alloy 230 has been shown to form chromium oxide layers on the surface at 950 • C [11,12] and aluminum oxide internally [11].…”

Section: Introductionmentioning

confidence: 99%

“…It was found that in an oxidizing environment, Inconel alloys form a passivating oxide layer, protecting the components from additional corrosion at high temperatures [11]. Alloy 230 has been shown to form chromium oxide layers on the surface at 950 • C [11,12] and aluminum oxide internally [11]. A comparison of the corrosion rates between irradiated and non-irradiated Inconel 718 at 900 • C shows that irradiation accelerates the growth of a denser scale of Cr 2 O 3 as well as the inner oxide layers of Al 2 O 3 and TiO 2 , and improves the material's resistance to oxidation [13].…”

Section: Introductionmentioning

confidence: 99%

The Influence of High-Temperature Helium and the Amount of Revert Material on the Material Properties of Inconel 738

et al. 2022

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Nickel-based alloys are considered promising materials for primary circuits of high-temperature gas reactors (HTGRs), specifically for gas turbines. The primary helium (He) coolant in the gas-turbine-based HTGRs is expected to reach temperatures of up to 900 °C; therefore, the selected materials should adequately perform over a long service life at such an environment. A promising manufacturing method in the production of reactor components is precision casting, where the content of revert (recyclate) material in the alloy differs and can influence the material behavior. In our study, Inconel alloy 738 was manufactured by casting 50% and 100% of revert material and tested in HTGR conditions to examine the influence of helium coolant on the material’s properties. Tensile specimens were exposed at 900 °C for 1000 h in helium containing a specified amount of gaseous impurities. Scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), in combination with X-ray diffraction (XRD) and nano-, microhardness methods, were used for material characterization after performing the tensile tests at room temperature. The presence of three types of layers was observed: a thin layer formed by aluminum and chromium oxides on the surface; non-uniform surface oxides Ti3O5 with inner (Al,Cr)2O3; and the inner fine-grained Inconel Cr-enriched phase (approx. 10–20 µm below the surface), which can act as a protective surface layer. Mechanical properties of both revert materials decreased after exposure to HTGR conditions but did not show a significant difference as a result of the content of the revert material. The increase of nano-hardness in line profiles throughout the specimen’s cross-section was observed locally at the surface oxides and in the precipitates and grain boundaries. After exposure, Rp0.2 values decreased by 20% and 17.7%, and Rm values by 12.3% and 20.8% in samples with 50 and 100% revert content, respectively. Furthermore, a decrease in microhardness values (HV0.1) was detected by 4.98% in longitude and 5.80% in cross-section for samples with 50% revert material and by 3.85% in longitude and 7.86% in cross-section for samples with 100% revert material. It can be concluded that both revert materials have similar corrosion resistance in HTGR conditions. The presented results complement the knowledge about the degradation of alloys in the coolant environment of advanced gas-cooled reactors.

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Effect of Minor Alloying Elements on the Oxidation Behavior of Ni-Base Alloys in a High-Temperature Steam Environment

Kim

Cha

et al. 2019

Oxid Met

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Long term oxidation resistance of alloys for gas-cooled reactors

Cited by 15 publications

References 15 publications

Corrosion and Creep of Candidate Alloys in High Temperature Helium and Steam Environments for the NGNP

Corrosion and Creep of Candidate Alloys in High Temperature Helium and Steam Environments for the NGNP

The Influence of High-Temperature Helium and the Amount of Revert Material on the Material Properties of Inconel 738

Effect of Minor Alloying Elements on the Oxidation Behavior of Ni-Base Alloys in a High-Temperature Steam Environment

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