Cyclic softening in the MA956 ODS steel

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

Cyclic softening in the MA956 ODS steel

Popis výsledku v původním jazyce

High chromium steel (MA956) prepared by mechanical alloying (MA) and strengthened by fine oxide dispersion was investigated. Corse microstructure with grains larger than 100 mm was revealed. The oxide distribution was analyzed by the means of transmission electron microscopy. Specimens were cycled with constant strain amplitude and strain rate at room temperature. Continuous cyclic softening consisting of three stages was measured. Short initial stage of rapid cyclic softening was followed by relativelylong stage where the softening rate is constant and lower than the one measured in the first stage. In last stage, cyclic softening rate again increases, but this rather influenced by the growth of long cracks. Cyclic softening and role of oxide dispersion was discussed in relation with microstructural observations. Moreover, microstructure and cyclic softening of the MA956 steel is compared with different ODS steels.

Název v anglickém jazyce

Cyclic softening in the MA956 ODS steel

Popis výsledku anglicky

High chromium steel (MA956) prepared by mechanical alloying (MA) and strengthened by fine oxide dispersion was investigated. Corse microstructure with grains larger than 100 mm was revealed. The oxide distribution was analyzed by the means of transmission electron microscopy. Specimens were cycled with constant strain amplitude and strain rate at room temperature. Continuous cyclic softening consisting of three stages was measured. Short initial stage of rapid cyclic softening was followed by relativelylong stage where the softening rate is constant and lower than the one measured in the first stage. In last stage, cyclic softening rate again increases, but this rather influenced by the growth of long cracks. Cyclic softening and role of oxide dispersion was discussed in relation with microstructural observations. Moreover, microstructure and cyclic softening of the MA956 steel is compared with different ODS steels.

Druh

O - Ostatní výsledky

CEP obor

JL - Únava materiálu a lomová mechanika

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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