Crystallography and Mechanical Properties of Intercritically Annealed Quenched and Partitioned High-Aluminium Steel

Tuomo Nyyssönen, Pasi Peura, Emmanuel De Moor, Veli-Tapani Kuokkala, Don L. Williamson

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)
    2 Downloads (Pure)

    Abstract

    The quenching and partitioning response of intercritically annealed steel with aluminum contents in the 2–3 wt.% range and a carbon content of 0.2 wt.% was studied. Two types of morphologies for retained austenite were observed in electron backscatter diffraction studies: blocky, untransformed austenite grains and partially transformed austenite located primarily at prior austenite and packet boundaries. The amount of retained austenite was found to correlate with the initial quench temperature, as well as with the uniform elongation of the specimens in subsequent tensile testing. The transformation characteristics of austenite were rationalized on the basis of prior austenite grain size and inhomogeneous carbon distribution. The martensite transformed during the initial quench was found to favor Σ3 twin-type lath combinations, supplemented by neighboring variants providing self-accommodation.
    Original languageEnglish
    Number of pages31
    JournalMaterials Characterization
    Early online date11 Dec 2018
    DOIs
    Publication statusPublished - 2019
    Publication typeA1 Journal article-refereed

    Keywords

    • steels, crystallography, mechanical properties, microstructure, martensite

    Publication forum classification

    • Publication forum level 1

    ASJC Scopus subject areas

    • Metals and Alloys

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