Extremely slow carbon diffusion in carbon-supersaturated surface of ferrite

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F14%3A00432048" target="_blank" >RIV/68081723:_____/14:00432048 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Extremely slow carbon diffusion in carbon-supersaturated surface of ferrite

Popis výsledku v původním jazyce

Carbon diffusion was studied in carbon-supersaturated surface layer of commercial ferrite- -martensite Cr-Mo steel P91 and in two model ferrite materials: in pure ?-Fe, and in ferrite Fe-Cr alloy. The carbon surface layer, the thickness of which was about 40 nm, was physical- -vapor-deposited and isothermal diffusion anneals were carried out at selected temperatures between 573 K and 1073 K. The depth profiles of carbon were measured by SIMS. It was found that the carbon diffusion proceeded much more slowly in carbon-supersaturated surfaces than in matrices with equilibrium carbon concentration. The carbon diffusion coefficients obtained, D, were close to literature values reported for C diffusion in carbide phase. Measured values of D in pure ?-Fe, ?-Fe-Cr and P91 steel above 773 K were identical. However, significantly higher values of D were measured in P91 below the temperature of 773 K, which was ascribed to different mobility of substitution elements.

Název v anglickém jazyce

Extremely slow carbon diffusion in carbon-supersaturated surface of ferrite

Popis výsledku anglicky

Carbon diffusion was studied in carbon-supersaturated surface layer of commercial ferrite- -martensite Cr-Mo steel P91 and in two model ferrite materials: in pure ?-Fe, and in ferrite Fe-Cr alloy. The carbon surface layer, the thickness of which was about 40 nm, was physical- -vapor-deposited and isothermal diffusion anneals were carried out at selected temperatures between 573 K and 1073 K. The depth profiles of carbon were measured by SIMS. It was found that the carbon diffusion proceeded much more slowly in carbon-supersaturated surfaces than in matrices with equilibrium carbon concentration. The carbon diffusion coefficients obtained, D, were close to literature values reported for C diffusion in carbide phase. Measured values of D in pure ?-Fe, ?-Fe-Cr and P91 steel above 773 K were identical. However, significantly higher values of D were measured in P91 below the temperature of 773 K, which was ascribed to different mobility of substitution elements.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BJ - Termodynamika

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Kovové materiály

ISSN

0023-432X

e-ISSN

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Svazek periodika

52

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

SK - Slovenská republika

Počet stran výsledku

9

Strana od-do

125-133

Kód UT WoS článku

000342483800001

EID výsledku v databázi Scopus

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