Microstructure and Mechanical Propertiesof a Nitride-Strengthened Reduced ActivationFerritic/Martensitic Steel

Qiangguo Zhou, Wenfeng Zhang, Wei Yan, Wei Wang, Wei Sha, Yiyin Shan, Ke Yang

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    Abstract

    Nitride-strengthened reduced activation ferritic/martensitic (RAFM) steels are developed taking advantage of the high thermal stability of nitrides. In the current study, the microstructure and mechanical properties of a nitride-strengthened RAFM steel with improved composition were investigated. Fully martensitic microstructure with fine nitrides dispersion was achieved in the steel. In all, 1.4 pct Mn is sufficient to suppress delta ferrite and assure the steel of the full martensitic microstructure. Compared to Eurofer97, the steel showed similar strength at room temperature but higher strength at 873 K (600 °C). The steel exhibited very high impact toughness and a low ductile-to-brittle transition temperature (DBTT) of 243 K (–30 °C), which could be further reduced by purification.
    Original languageEnglish
    Pages (from-to)5079-5087
    Number of pages9
    JournalMetallurgical and Materials Transactions A
    Volume43
    Issue number13
    Early online date19 Jul 2012
    DOIs
    Publication statusPublished - Dec 2012

    Keywords

    • Nitride strengthened
    • Reduced activation
    • Toughness
    • Martensitic steel
    • Inclusion

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