Heat resistance and microstructure evolution in AISI 316LN+0.1 % Nb steel at 600 AND 625 degrees C

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

Heat resistance and microstructure evolution in AISI 316LN+0.1 % Nb steel at 600 AND 625 degrees C

Popis výsledku v původním jazyce

Creep resistance of austenitic steels can be improved by small additions of strong carbide and nitride forming elements. Additions of such elements to steels have to be followed by detailed investigations on microstructural stability and surveys of creep failure mechanisms. This paper deals with creep behaviour and microstructure evolution in the AISI 316LN + 0.1 wt. % Nb steel during long-term creep exposure at 600 and 625 degrees C. Creep tests with a constant tensile load were carried out in air up to times to rupture of 200 000 hours. Microstructure evolution during long-term creep exposure was studied using light microscopy, scanning and transmission electron microscopy. A small addition of niobium resulted in a reduction of the minimum creep rate and shortening of the tertiary creep stage. Investigations on microstructure evolution in creep ruptured specimens revealed the following minor phases: Z-phase (NbCrN), M23C6, M6X (Cr3Ni2SiX type), eta-Laves and sigma-phase. M6X gradually replaced M23C6 carbides. Primary Z-phase particles were present in the matrix after solution annealing, while secondary Z-phase particles formed during creep. Precipitation of Z-phase was more intensive at 625 degrees C. The dimensional stability of Z-phase particles was excellent and these particles had a positive effect on the minimum creep rate. However, niobium also accelerated the formation and coarsening of sigma-phase, eta-Laves and M6X. Coarse particles, especially of sigma-phase, facilitated the development of creep damage, which resulted in poor long-term creep ductility.

Název v anglickém jazyce

Heat resistance and microstructure evolution in AISI 316LN+0.1 % Nb steel at 600 AND 625 degrees C

Popis výsledku anglicky

Creep resistance of austenitic steels can be improved by small additions of strong carbide and nitride forming elements. Additions of such elements to steels have to be followed by detailed investigations on microstructural stability and surveys of creep failure mechanisms. This paper deals with creep behaviour and microstructure evolution in the AISI 316LN + 0.1 wt. % Nb steel during long-term creep exposure at 600 and 625 degrees C. Creep tests with a constant tensile load were carried out in air up to times to rupture of 200 000 hours. Microstructure evolution during long-term creep exposure was studied using light microscopy, scanning and transmission electron microscopy. A small addition of niobium resulted in a reduction of the minimum creep rate and shortening of the tertiary creep stage. Investigations on microstructure evolution in creep ruptured specimens revealed the following minor phases: Z-phase (NbCrN), M23C6, M6X (Cr3Ni2SiX type), eta-Laves and sigma-phase. M6X gradually replaced M23C6 carbides. Primary Z-phase particles were present in the matrix after solution annealing, while secondary Z-phase particles formed during creep. Precipitation of Z-phase was more intensive at 625 degrees C. The dimensional stability of Z-phase particles was excellent and these particles had a positive effect on the minimum creep rate. However, niobium also accelerated the formation and coarsening of sigma-phase, eta-Laves and M6X. Coarse particles, especially of sigma-phase, facilitated the development of creep damage, which resulted in poor long-term creep ductility.

Druh

D - Stať ve sborníku

CEP obor

JF - Jaderná energetika

OECD FORD obor

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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

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

METAL 2016: 25TH Anniversary International Conference on Metallurgy and Materials

ISBN

978-80-87294-67-3

ISSN

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e-ISSN

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Počet stran výsledku

6

Strana od-do

837-842

Název nakladatele

Tanger Ltd

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

25. 5. 2016

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

000391251200135