The effect of FeO grain size and cavities on the oxidation of Fe

Caplan, D.; Hussey, R. J.; Sproule, G. I.; Graham, M. J.

doi:10.1016/0010-938x(81)90017-2

Cited by 22 publications

(9 citation statements)

References 22 publications

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“…1. Parabolic rate constants determined in this work are in good agreement with data available in the literature [5,11,18,19,23,[31][32][33][34][35][36].…”

Section: Materials and Experimental Proceduressupporting

confidence: 86%

Iron Oxidation at Low Temperature (260–500 °C) in Air and the Effect of Water Vapor

et al. 2009

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The oxidation of iron has been studied at low temperatures (between 260 and 500°C) in dry air or air with 2 vol% H 2 O, in the framework of research on dry corrosion of nuclear waste containers during long-term interim storage. Pure iron is regarded as a model material for low-alloyed steel. Oxidation tests were performed in a thermobalance (up to 250 h) or in a laboratory furnace (up to 1000 h). The oxide scales formed were characterized using SEM-EDX, TEM, XRD, SIMS and EBSD techniques. The parabolic rate constants deduced from microbalance experiments were found to be in good agreement with the few existing values of the literature. The presence of water vapor in air was found to strongly influence the transitory stages of the kinetics. The entire structure of the oxide scale was composed of an internal duplex magnetite scale made of columnar grains and an external hematite scale made of equiaxed grains. 18 O tracer experiments performed at 400°C allowed to propose a growth mechanism of the scale.

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“…1. Parabolic rate constants determined in this work are in good agreement with data available in the literature [5,11,18,19,23,[31][32][33][34][35][36].…”

Section: Materials and Experimental Proceduressupporting

confidence: 86%

Iron Oxidation at Low Temperature (260–500 °C) in Air and the Effect of Water Vapor

et al. 2009

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“…Compared the parabolic rate constants of previous studies [41,[45][46][47][48] with the present work, the solid line signified the current study lies along the upper limit of the spread of k p values for the dot line. The activation energy of 179.2 kJ/mol corresponds closely to that of iron reported 194.9 kJ/mol (46.6 kcal/mol) between 640 and 805 C [45]. Further, the lower value of activation energy exactly approximates to that 174.5 kJ/mol for Fe in the Fe grain boundaries diffusion between 530 and 650 C [49].…”

Section: Initiation Of Oxidation Mechanismsupporting

confidence: 58%

Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale

Jiang

Zhao

et al. 2014

Corrosion Science

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Q. (2014). Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale. Corrosion Science, Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale AbstractThe formation mechanism of tight oxide scale on the microalloyed steel was investigated at temperatures of 550-850 °C in dry air. Microstructural characterisations reveal that the spallation of oxide scale dominates at the centre of coarse grains on the oxidation initiation. The fine-grained steel improves the adhesive properties of oxide scale by enhanced grain-boundary diffusion. The lower activation energy and higher oxidation rate accelerate cation/anion migration along grain boundaries, leading to high magnetite content in the oxide scale. The approach by grain refinement at initial oxidation has been proposed to generate the pickle-free tight oxide scale. Q. (2014). Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale. Corrosion Science, 85 115-125. AbstractThe formation mechanism of tight oxide scale on the microalloyed steel was investigated at temperatures of 550 to 850 C in dry air. Microstructural characterisations reveal that the spallation of oxide scale dominates at the centre of coarse grains on the oxidation initiation. The fine-grained steel improves the adhesive properties of oxide scale by enhanced grain-boundary diffusion. The lower activation energy and higher oxidation rate accelerate cation/anion migration along grain boundaries, leading to high magnetite content in the oxide scale. The approach by grain refinement at initial oxidation has been proposed to generate the pickle-free tight oxide scale.

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“…For instance, it was reported that FeO can readily form on the surface at 604°C in air, which is close to the used oxidation temperature but is in contrast to the phases found by XRD and EDX (Figure and Table ). The second possibility would be that a two‐layered structure consisting of hematite and magnetite in the ratio of 1:10 or 1:20 could have been formed because the used oxidation temperature is only 30°C above the wustite temperature. This would not be in accordance with the fact that ca.…”

Section: Discussionmentioning

confidence: 99%

Influence of machining processes on rim zone properties and high temperature oxidation behavior of 42CrMo4

Zander

Klink

Harst

et al. 2019

Materials & Corrosion

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The influence of different machining processes, grinding, electrochemical machining, and electro discharge machining on the surface integrity, described by residual stresses, roughness, and chemical composition, is investigated to explain their effect on the high temperature oxidation behavior of martensitic 42CrMo4 steel in an oxygen atmosphere. The results obtained by thermogravimetric in situ experiments reveal that compressive residual stresses and a smaller reactive surface adjusted by grinding lead to an improved oxidation resistance compared with electrochemical machined surfaces. Surface modification by electro discharge machining appears to be most suitable to achieve oxidation resistance due to decelerated initiation of the oxide layer growth compared with the ground surface. The improved oxidation resistance of electro discharge machined and ground surfaces is linked to the modified chemical composition of the rim zone and the rim zone residual stresses, respectively. K E Y W O R D Selectro discharge machining, electrochemical machining, oxidation, residual stress, rim zone, steel

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The effect of FeO grain size and cavities on the oxidation of Fe

Cited by 22 publications

References 22 publications

Iron Oxidation at Low Temperature (260–500 °C) in Air and the Effect of Water Vapor

Iron Oxidation at Low Temperature (260–500 °C) in Air and the Effect of Water Vapor

Effect of a grain-refined microalloyed steel substrate on the formation mechanism of a tight oxide scale

Influence of machining processes on rim zone properties and high temperature oxidation behavior of 42CrMo4

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