Hydrogen diffusion and hydrogen provoked degradation in the trip 800 Mn-Si-Al steel

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F16%3A86099849" target="_blank" >RIV/61989100:27360/16:86099849 - 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

Hydrogen diffusion and hydrogen provoked degradation in the trip 800 Mn-Si-Al steel

Popis výsledku v původním jazyce

The presented paper deals with hydrogen diffusion and hydrogen provoked degradation in the TRIP 800 Mn-Si-Al steel with increased aluminum content. The steel was studied after standard heat treatment including two step annealing - an intercritical annealing and an annealing in the range of bainitic transformation. A part of specimens was submitted to a plastic deformation in tension (5 and 10 %) in order to modify both structure and mechanical properties. Microstructure of the steel consisted predominantly of ferrite, bainite and retained austenite, the amount of which decreased with increasing extent of the plastic deformation. Hydrogen diffusion was studied by electrochemical permeation method. Hydrogen diffusion coefficients were calculated using the "time lag" method. The lowest values of hydrogen diffusion coefficients were always observed for the first buildup transient, while the highest values were recorded for the second build-up transient due to the less intense hydrogen trapping. As to the impact of deformation, the highest hydrogen diffusion coefficients were observed after 5 % tensile deformation. Subsurface hydrogen concentration reached maximal value approx. 14 mass ppm. Hydrogen embrittlement of the steel was studied using tensile tests after previous electrolytic charging in diluted sulfuric acid solution. Hydrogen embrittlement manifested itself mainly by a drop of elongation at fracture. As to the fracture morphology, hydrogen embrittlement resulted in a change of fracture mode from transgranular ductile fracture to transgranular cleavage fracture with an appearance of "fish eyes" initiated on aluminum rich non-metallic inclusions.

Název v anglickém jazyce

Hydrogen diffusion and hydrogen provoked degradation in the trip 800 Mn-Si-Al steel

Popis výsledku anglicky

The presented paper deals with hydrogen diffusion and hydrogen provoked degradation in the TRIP 800 Mn-Si-Al steel with increased aluminum content. The steel was studied after standard heat treatment including two step annealing - an intercritical annealing and an annealing in the range of bainitic transformation. A part of specimens was submitted to a plastic deformation in tension (5 and 10 %) in order to modify both structure and mechanical properties. Microstructure of the steel consisted predominantly of ferrite, bainite and retained austenite, the amount of which decreased with increasing extent of the plastic deformation. Hydrogen diffusion was studied by electrochemical permeation method. Hydrogen diffusion coefficients were calculated using the "time lag" method. The lowest values of hydrogen diffusion coefficients were always observed for the first buildup transient, while the highest values were recorded for the second build-up transient due to the less intense hydrogen trapping. As to the impact of deformation, the highest hydrogen diffusion coefficients were observed after 5 % tensile deformation. Subsurface hydrogen concentration reached maximal value approx. 14 mass ppm. Hydrogen embrittlement of the steel was studied using tensile tests after previous electrolytic charging in diluted sulfuric acid solution. Hydrogen embrittlement manifested itself mainly by a drop of elongation at fracture. As to the fracture morphology, hydrogen embrittlement resulted in a change of fracture mode from transgranular ductile fracture to transgranular cleavage fracture with an appearance of "fish eyes" initiated on aluminum rich non-metallic inclusions.

Druh

D - Stať ve sborníku

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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Projekt

<a href="/cs/project/LO1203" target="_blank" >LO1203: Regionální materiálově technologické výzkumné centrum - Program udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

METAL 2016: conference proceedings : (reviewed version) : 25th Anniversary International Conference on Metallurgy and Materials : May 25th-27th 2016, Hotel Voronez I, Brno, Czech Republic, EU

ISBN

978-80-87294-67-3

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

759-764

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

25. 5. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000391251200122