Mass spectrometric studies of alloys proposed for high temperature reactor systems

Hilpert, K.; Gerads, H.; Lupton, D. F.

doi:10.1016/0022-3115(79)90228-9

Cited by 18 publications

(16 citation statements)

References 2 publications

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“…Indeed, depending on their chemical composition, alloys containing almost the same chromium content exhibited large variations in a Cr . Extrapolated at 900 8C, a Cr reached 0.34 in Inconel 617 (Ni-22Cr-12Co-9Mo), whereas it was 0.74 in Inconel 643 (Ni-25Cr-12Co-9W) [13,14]. [8].…”

Section: Destruction Of the Oxide Layer At Higher Temperaturementioning

confidence: 99%

Oxide-Layer Formation and Stability on a Nickel-Base Alloy in Impure Helium at High Temperature

et al. 2007

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International audienceThe corrosion behavior in impure helium of Haynes 230, a nickel base alloy candidate for heat exchangers in Very High Temperature Reactors (VHTR), has been investigated. The study focused on the formation and the subsequent destruction of the surface oxide layer at 900 °C and 980 °C. In-situ gas-phase analysis coupled to post-exposure surface analyses showed that a chromium-rich surface oxide formed on Haynes 230 at 900 °C but was unstable above a critical temperature T A : the chromium-rich oxide reacted with carbon in solution in the alloy to produce chromium and CO(g). The effect of carbon monoxide partial pressure in the gas phase as well as the influence of chromium and carbon activities in the alloy on T A are discussed taking thermodynamics and kinetics aspects into account

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Section: Destruction Of the Oxide Layer At Higher Temperaturementioning

confidence: 99%

Oxide-Layer Formation and Stability on a Nickel-Base Alloy in Impure Helium at High Temperature

et al. 2007

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“…[3,9] At 850ºC the kinetic constants are relatively well known and have been validated through extensive comparison between prediction and actual microstructures observed after long term exposure to the impure helium. [9] At higher temperatures the constants are based on extrapolation from known values at 850ºC and experimental validation is limited or non-existent.…”

Section: Figure 3 Calculated Stability Diagrams For Inconel 617 For mentioning

confidence: 99%

Controlled Chemistry Helium High Temperature Materials Test Loop

Wright¹

2005

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“…Figure 8 gives a chromium activity equal to 0.76 and 0.69, respectively, under 15 and 5 mbar P H 2 O . However, this value does not represent the chromium activity of the matrix but a chromium activity in the region near the surface because estimations of the chromium activity by measurement of the saturated vapour in chromium showed that the real activity in chromium in the Inconel 617 is 0.33 instead of 0.6 in 950 8C [5].…”

Section: Parameters P Co P H 2 O P Hmentioning

confidence: 99%

Parameters governing the reduction of oxide layers on Inconel 617 in impure VHTR He atmosphere

Chapovaloff¹,

Kaczorowski

Girardin³

2008

Materials & Corrosion

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The very high temperature reactor (VHTR) has been selected as among the Generation IV nuclear power system. The coolant, namely helium, has been shown to contain low level of oxidizing as well as carbon-bearing impurities (such as H 2 , CO (and CO 2 ), CH 4 , N 2 ranging from a few microbars to hundreds of microbars and water vapour in the microbar range) that can interact with metals at high temperature. In this specific gas phase, there is a competition between the formation of protective oxide scales and deleterious reactions towards carbon. A possible oxide layer reduction could be observed in a particular case detailed in this paper. This destruction of the oxide can imply consequences on the behaviour of the alloy as strong carburization or deep internal oxidation could occur. The influence of the level of impurities was analysed through a parametric approach. The experiments were carried out in a purposedesigned device that allows the control of low impurity partial pressures.

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Mass spectrometric studies of alloys proposed for high temperature reactor systems

Cited by 18 publications

References 2 publications

Oxide-Layer Formation and Stability on a Nickel-Base Alloy in Impure Helium at High Temperature

Oxide-Layer Formation and Stability on a Nickel-Base Alloy in Impure Helium at High Temperature

Controlled Chemistry Helium High Temperature Materials Test Loop

Parameters governing the reduction of oxide layers on Inconel 617 in impure VHTR He atmosphere

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