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Effect of copper on properties of fine-grained low-carbon boron steel

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26316919%3A_____%2F19%3AN0000048" target="_blank" >RIV/26316919:_____/19:N0000048 - isvavai.cz</a>

  • Nalezeny alternativní kódy

    RIV/26316919:_____/19:N0000047

  • Výsledek na webu

  • DOI - Digital Object Identifier

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Effect of copper on properties of fine-grained low-carbon boron steel

  • Popis výsledku v původním jazyce

    Low carbon steels are used in variety of structural states. One of the most used is fine grained dual or multiphase structure with prevailing ferrite. Martensite/austenite islands forms rest of the structure. At least two of the phases - pearlite, bainite, martensite and rest austenite - occur in multi-phase steels. Main strengthening mechanisms are grain refinement and the hard phase content. The mostly ferritic soft matrix ensures sufficient plasticity. The constraining phenomena is cohesion of soft ferrite and the hard phase for the steel performance. Voids open upon deformation at the boundary between these constituents and lead to fracture. The difference in strength can be reduced by softening of the hard phase or by strengthening the ferrite. Copper alloying has possibility to do ferrite strengthening by precipitation. The experimental steel was subjected to controlled rolling to achieve dual- or multi-phase structure. Deformation in intercritical region resulted in fine ferritic matrix. Samples were subsequently quenched in water to transform remaining austenite into hard martensite or bainite. The delay between rolling and quenching gave opportunity for Cu to precipitate in freshly-formed ferrite and strengthen it. This approach leaves opportunity to gain precipitation strengthening in soft phase with no loss in hard phase strength. This is different from conventional quenching and tempering approach. The tempering acts also as precipitation hardening, but the tempering decreases strength of martensite in far higher rate than Cu precipitation can strengthen the ferritic matrix.

  • Název v anglickém jazyce

    Effect of copper on properties of fine-grained low-carbon boron steel

  • Popis výsledku anglicky

    Low carbon steels are used in variety of structural states. One of the most used is fine grained dual or multiphase structure with prevailing ferrite. Martensite/austenite islands forms rest of the structure. At least two of the phases - pearlite, bainite, martensite and rest austenite - occur in multi-phase steels. Main strengthening mechanisms are grain refinement and the hard phase content. The mostly ferritic soft matrix ensures sufficient plasticity. The constraining phenomena is cohesion of soft ferrite and the hard phase for the steel performance. Voids open upon deformation at the boundary between these constituents and lead to fracture. The difference in strength can be reduced by softening of the hard phase or by strengthening the ferrite. Copper alloying has possibility to do ferrite strengthening by precipitation. The experimental steel was subjected to controlled rolling to achieve dual- or multi-phase structure. Deformation in intercritical region resulted in fine ferritic matrix. Samples were subsequently quenched in water to transform remaining austenite into hard martensite or bainite. The delay between rolling and quenching gave opportunity for Cu to precipitate in freshly-formed ferrite and strengthen it. This approach leaves opportunity to gain precipitation strengthening in soft phase with no loss in hard phase strength. This is different from conventional quenching and tempering approach. The tempering acts also as precipitation hardening, but the tempering decreases strength of martensite in far higher rate than Cu precipitation can strengthen the ferritic matrix.

Klasifikace

  • Druh

    D - Stať ve sborníku

  • CEP obor

  • OECD FORD obor

    20501 - Materials engineering

Návaznosti výsledku

  • 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)

Ostatní

  • Rok uplatnění

    2019

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název statě ve sborníku

    METAL 2019 - 28th International Conference on Metallurgy and Materials

  • ISBN

    978-808729492-5

  • ISSN

  • e-ISSN

  • Počet stran výsledku

    6

  • Strana od-do

    129-134

  • Název nakladatele

    TANGER Ltd.

  • Místo vydání

    Ostrava

  • Místo konání akce

    Brno

  • Datum konání akce

    22. 5. 2019

  • Typ akce podle státní příslušnosti

    WRD - Celosvětová akce

  • Kód UT WoS článku