HYDROGEN DIFFUSION IN THE TRIP 800 STEEL WITH HIGHER PHOSPHORUS CONTENT - EFFECT OF DEFORMATION

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

HYDROGEN DIFFUSION IN THE TRIP 800 STEEL WITH HIGHER PHOSPHORUS CONTENT - EFFECT OF DEFORMATION

Popis výsledku v původním jazyce

Hydrogen diffusion characteristics were studied in C-Mn-Si TRIP 800 steel containing 0.05 mass % of phosphorus. The steel was tested in as-received state and also in states corresponding to 5 and 10 % tensile deformation. Steel microstructure was analyzed by light microscopy, scanning electron microscopy and X-ray diffraction. Hydrogen diffusion characteristics were studied by means of electrochemical permeation method. Two build up transients corresponding to lower and higher charging current densities as well as a decay transient were recorded during permeation experiments. In the as-received state, steel microstructure consisted of ferrite, bainite and approx. 14 % of retained austenite. The tensile deformation resulted in a decrease of retained austenite content and in a considerable increase of yield and tensile strength. Hydrogen diffusion coefficients of the studied TRIP steel varied from 1.6 x 10(-7) cm(2).s(-1) to 1.3 x 10(-6) cm(2).s(-1). The lowest values corresponded to the as-received state -without deformation; the highest ones corresponded to 5 % tensile deformation. For one state, the lowest values of hydrogen diffusion coefficient were observed during the first build up transient. During the second build up transient corresponding to the higher charging current density, hydrogen diffusion coefficients increased markedly reflecting thus the fact that hydrogen trapping was less pronounced. For decay transients hydrogen diffusion coefficients were situated between values obtained for the 1st and 2nd build up transients. Very high sub-surface hydrogen concentrations (up to 35 ppm) were obtained from the permeation results.

Název v anglickém jazyce

HYDROGEN DIFFUSION IN THE TRIP 800 STEEL WITH HIGHER PHOSPHORUS CONTENT - EFFECT OF DEFORMATION

Popis výsledku anglicky

Hydrogen diffusion characteristics were studied in C-Mn-Si TRIP 800 steel containing 0.05 mass % of phosphorus. The steel was tested in as-received state and also in states corresponding to 5 and 10 % tensile deformation. Steel microstructure was analyzed by light microscopy, scanning electron microscopy and X-ray diffraction. Hydrogen diffusion characteristics were studied by means of electrochemical permeation method. Two build up transients corresponding to lower and higher charging current densities as well as a decay transient were recorded during permeation experiments. In the as-received state, steel microstructure consisted of ferrite, bainite and approx. 14 % of retained austenite. The tensile deformation resulted in a decrease of retained austenite content and in a considerable increase of yield and tensile strength. Hydrogen diffusion coefficients of the studied TRIP steel varied from 1.6 x 10(-7) cm(2).s(-1) to 1.3 x 10(-6) cm(2).s(-1). The lowest values corresponded to the as-received state -without deformation; the highest ones corresponded to 5 % tensile deformation. For one state, the lowest values of hydrogen diffusion coefficient were observed during the first build up transient. During the second build up transient corresponding to the higher charging current density, hydrogen diffusion coefficients increased markedly reflecting thus the fact that hydrogen trapping was less pronounced. For decay transients hydrogen diffusion coefficients were situated between values obtained for the 1st and 2nd build up transients. Very high sub-surface hydrogen concentrations (up to 35 ppm) were obtained from the permeation results.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

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

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název statě ve sborníku

METAL 2015 : 24th International Conference on Metallurgy and Materials : conference proceedings : June 3rd-5th 2015, Hotel Voroněž I, Brno, Czech Republic, EU

ISBN

978-80-87294-62-8

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

6

Strana od-do

511-516

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

3. 6. 2015

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000374706100079