A new 12% chromium steel strengthened by Z-phase precipitates

Fang Liu, Masoud Rashidi, Lennart Johansson, John Hald, Hans-Olof Andren

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    Abstract

    In order to increase the corrosion resistance and simultaneously maintain the creep resistance of 9-12% Cr steels at 650 degrees C, a new alloy design concept was proposed, using thermodynamically stable Z-phase (CrTaN) precipitates to strengthen the steel. A new trial Z-phase strengthened 12% Cr steel was produced and creep tested. The steel exhibited good long-term creep resistance. Dense nano-sized Z-phase precipitates were formed at an early stage, and coarsened slowly. They remained small after more than 10,000 h. (C) 2015 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    JournalScripta Materialia
    Volume113
    Pages (from-to)93-96
    ISSN1359-6462
    DOIs
    Publication statusPublished - 2016

    Keywords

    • Martensitic steels
    • Creep
    • Three-dimensional atom probe
    • Transmission election microscopy

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