Carburization of Austenitic and Ferritic Steels in Carbon-Saturated Sodium: Preliminary Results on the Diffusion Coefficient of Carbon at 873 K

Romedenne, Marie; Rouillard, Fabien; Duprey, Brigitte; Hamon, Didier; Tabarant, Michel; Monceau, Daniel

doi:10.1007/s11085-017-9733-5

Cited by 8 publications

(6 citation statements)

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“…Three quantitative profiles (step 4 μm) were realized in each sample and showed a relative deviation of 5%. The total carbon content deduced from the EPMA profiles was in accordance with the values obtained using carbon combustion analysis and in agreement with the mass gain measurements within ± 5% [20].…”

Section: Introductionsupporting

confidence: 87%

Carburization of austenitic and ferritic stainless steels in liquid sodium: Comparison between experimental observations and simulations

et al. 2019

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Three steels were exposed in carburizing sodium at 600 and 650°C. The kinetics and extent of carburization were characterized. Numerical simulations using the coupled thermodynamic-kinetic modeling software DICTRA were performed. It was proposed that the observed carbon diffusion profiles were induced by the combined diffusion of carbon in the grains and at grain boundaries coupled with the slow formation of carbides. The blocking effect of carbides on the carbon diffusion was observed to evolve as a function of time and microstructure. Acceptable agreement between experimental and simulated intragranular carbon profiles was achieved by optimizing the labyrinth factor and phases.

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Section: Introductionsupporting

confidence: 87%

Carburization of austenitic and ferritic stainless steels in liquid sodium: Comparison between experimental observations and simulations

et al. 2019

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“…The carburization degree and carburization depths of the steels were much lower than the ones obtained in highly carburizing sodium observed in a previous study at 600 °C. 5 Complementary experiments are needed to understand the evolution of the chemical interaction between the B 4 C powder and the steels. Furthermore, tensile test will be done to study the impact of the boro-carburization on the mechanical properties of the steels.…”

Section: Discussionmentioning

confidence: 99%

“…This carbon quantification method has been shown to be quite effective for highly carburized steel samples in a previous study. 5 Point scan mode (diameter around 1 µm) was used to measure boron concentration. 0.2 wt.% of boron was subtracted to all the boron profiles to adjust the Kα B line position.…”

Section: Methodsmentioning

confidence: 99%

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Chemical Interaction of Austenitic and Ferritic Steels with B₄C Powder in Liquid Sodium at 600°C

et al. 2019

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In the framework of studies on the control rods lifetime for the Sodium Fast Reactor prototype development, three commercial steels were exposed to B 4 C powder in sodium at 600 °C for durations up to 3000 h. Analyses by optical and secondary electron microscopy, electron microprobe and glow discharge optical emission spectrometry revealed the formation of borides layers on the steel surface and slight carburization deeper in the steels. The growth of the boride layers followed parabolic kinetics. The natures of the formed boride layers were in good agreement with thermodynamic equilibrium predicted by Thermo-Calc software. The carburization depths were much lower than the ones obtained in pure carburizing sodium at 600 °C. It did not grow with time revealing possible protective character of the boride layers against carbon penetration.

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“…More details on the procedure for carburization experiments in sodium can be found in previous works. [16,17,25] B. High-Energy X-Ray Diffraction Experiment…”

Section: A Materials and Carburization Experimentsmentioning

confidence: 99%

Microstructural and Chemical Changes of a Ti-Stabilized Austenitic Stainless Steel After Exposure to Liquid Sodium at Temperatures Between 500 °C and 650 °C

Slim

Géandier

Malard

et al. 2021

Metall Mater Trans A

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Ti-stabilized austenitic stainless steel was carburized in sodium containing a high carbon activity at three different temperatures, 500 °C, 600 °C, and 650 °C during 1000 hours and 5000 hours. The carbon profile, the carbide volume fraction, and the lattice parameter evolution as fonction of depth were determined using high-energy X-ray diffraction and electron probe microanalysis. At 650 °C and 600 °C, the carbon precipitated as M 23 C 6 and M 7 C 3 carbides in the sample. The volume fraction of M 7 C 3 carbides was lower than predicted by thermodynamic equilibrium using Thermo-Calc software ® . At 500 °C, carbides almost did not form in the steel. Instead, high carbon supersaturation of the austenitic matrix occurred. Both results demonstrate that the carburiz.ation profile was strongly influenced by the kinetics of carbide formation at temperatures lower than 650 °C. High-energy X-ray diff raction measurements demonstrated that the austenite and carbide lattice parameters evolved along the carbon profile. Both measured lattice parameter profi les of austenite and M 23 C 6 carbide were compared to the ones predicted from chemical changes of austenite and carbides.

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Carburization of Austenitic and Ferritic Steels in Carbon-Saturated Sodium: Preliminary Results on the Diffusion Coefficient of Carbon at 873 K

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 18113To link to this article:

Cited by 8 publications

References 12 publications

Carburization of austenitic and ferritic stainless steels in liquid sodium: Comparison between experimental observations and simulations

Carburization of austenitic and ferritic stainless steels in liquid sodium: Comparison between experimental observations and simulations

Chemical Interaction of Austenitic and Ferritic Steels with B₄C Powder in Liquid Sodium at 600°C

Microstructural and Chemical Changes of a Ti-Stabilized Austenitic Stainless Steel After Exposure to Liquid Sodium at Temperatures Between 500 °C and 650 °C

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Carburization of Austenitic and Ferritic Steels in Carbon-Saturated Sodium: Preliminary Results on the Diffusion Coefficient of Carbon at 873 K

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 18113To link to this article:

Cited by 8 publications

References 12 publications

Carburization of austenitic and ferritic stainless steels in liquid sodium: Comparison between experimental observations and simulations

Carburization of austenitic and ferritic stainless steels in liquid sodium: Comparison between experimental observations and simulations

Chemical Interaction of Austenitic and Ferritic Steels with B4C Powder in Liquid Sodium at 600°C

Microstructural and Chemical Changes of a Ti-Stabilized Austenitic Stainless Steel After Exposure to Liquid Sodium at Temperatures Between 500 °C and 650 °C

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Chemical Interaction of Austenitic and Ferritic Steels with B₄C Powder in Liquid Sodium at 600°C