Effects of microstructure on the dynamic strain aging of ferritic pearlitic steels at high strain rates

Ahmad Mardoukhi, Jari Rämö, Taina Vuoristo, Amandine Roth, Mikko Hokka, Veli-Tapani Kuokkala

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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    Abstract

    This paper presents an experimental study of the effects of dynamic strain aging on the mechanical behavior of selected high carbon and chromium-manganese steels in dynamic loading condition. In ferritic-pearlitic steels, the dynamic strain aging is typically caused by carbon, nitrogen, and possibly some other small solute atoms. Therefore, the thermomechanical treatments affect strongly how strong the dynamic strain aging effect is and at what temperature and strain rate regions the maximum effect is observed. In this work, we present results of the high temperature dynamic compression tests carried out for two different ferritic-pearlitic steels, 16MnCr5 and C60, that were heat treated to produce different microstructure variants of these standard alloys. The microstructures were analyzed using electron microscopy, and the materials were tested with the Split Hopkinson Pressure Bar device at three different strain rates at temperatures ranging from room temperature up to 680 °C to study the effect of the heat treatments and the resulting microstructures on the dynamic behavior of the steels and the dynamic strain aging effect. The results indicate that for both steels, a coarse grain structure has the strongest dynamic strain aging sensitivity at small plastic strains. However, at higher strains, all microstructures show similar strain aging sensitivities.
    Original languageEnglish
    Title of host publicationDYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
    PublisherEDP Sciences
    Number of pages6
    Volume183
    ISBN (Print)9782759890538
    DOIs
    Publication statusPublished - 7 Sep 2018
    Publication typeA4 Article in conference proceedings
    EventInternational conference on the mechanical and physical behaviour of materials under dynamic loading -
    Duration: 1 Jan 1900 → …

    Publication series

    NameEPJ WEB OF CONFERENCES
    PublisherEDP Sciences
    ISSN (Print)2100-014X

    Conference

    ConferenceInternational conference on the mechanical and physical behaviour of materials under dynamic loading
    Period1/01/00 → …

    Publication forum classification

    • Publication forum level 1

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