Early stage SCC initiation analysis of fcc Fe–Cr–Ni ternary alloy at 288 °C: A quantum chemical molecular dynamics approach

Das, Nishith Kumar; Suzuki, Ken; Ogawa, Kōichi; Shoji, Tetsuo

doi:10.1016/j.corsci.2009.01.005

Cited by 71 publications

(25 citation statements)

References 28 publications

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“…[25] It was found that the presence of H 2 /H 2 O promotes internal oxidation of Fe-Cr alloys, which was attributed to enhanced oxygen solubility or diffusivity as a result of hydrogen dissolution in the alloy matrix. Indications for such an effect of dissolved hydrogen in Fe-based alloys were found by molecular dynamics calculations, [26] although the material (Fe-Cr-Ni) and temperatures considered differed substantially from those in the present work and in Reference 25.…”

Section: B Fecraly+zr Oxidation In Ar-h 2 -H 2 Omentioning

confidence: 70%

Effect of Zr Additions on the Oxidation Kinetics of FeCrAlY Alloys in Low and High pO2 Gases

Young

Naumenko

Wessel

et al. 2010

Metall Mater Trans A

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Alloys of nominal composition Fe-20Cr-5Al-0.05Y (mass pct) with and without a 0.03 pct Zr addition were isothermally oxidized at temperatures of 1473 to 1573 K (1200 to 1300°C) in both flowing Ar-O 2 and Ar-H 2 -H 2 O. Continuous thermogravimetric (TG) measurements of oxygen uptake showed the rates to be faster in both gases for Zr-containing than for the Zr-free alloy. Scale growth on the Zr-bearing alloy by inward oxygen diffusion is accelerated by the fine alumina grain size and the formation of elongated zirconia particles in the two-phase scales. Zirconia formation ceases when the supply of metal in the thin alloy substrate is exhausted, and subsequent single-phase alumina growth proceeds at a slower rate. A simple diffusion model is shown to account semiquantitatively for zirconium enrichment in alumina scales. The presence of hydrogen modifies both oxygen transport in the scale and its permeability in the alloy.

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Section: B Fecraly+zr Oxidation In Ar-h 2 -H 2 Omentioning

confidence: 70%

Effect of Zr Additions on the Oxidation Kinetics of FeCrAlY Alloys in Low and High pO2 Gases

Young

Naumenko

Wessel

et al. 2010

Metall Mater Trans A

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show abstract

“…6(b). In the meantime, Ni and Fe ions, which have much higher diffusion rates than Cr ion in oxide [33,34], could easily diffuse through the surface oxide film and form discrete Ni-Fe spinel oxides on the oxide film by dissolution-precipitation mechanism [14]. As such, the less protective nature of the oxide film on CPS caused a thicker oxide film in association with a high density of discrete oxides on the film in the following exposures.…”

Section: Discussionmentioning

confidence: 99%

Effect of electropolishing on corrosion of Alloy 600 in high temperature water

et al. 2015

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“…For example the intrinsic diffusivity of carbon in austenitic iron increases with increasing carbon content 26 which is usually interpreted in terms of the carbon interstitials expanding the Fe lattice and thus increasing their own mobility. Recently Das et al 27 showed a correlation between presence of dissolved hydrogen and the oxygen diffusion in austenitic steels using quantum chemical molecular dynamics.…”

Section: Breakdown Of Protective Chromia Scales By Water Vapormentioning

confidence: 99%