Influence of the Ti Content on the Grain Stability and the Recrystallization Behavior of Nb-Alloyed High-Strength Low-Alloyed Steels

Stefan Monschein, Katharina Ragger, Dominik Zügner, Josef Fasching, Ronald Schnitzer

    Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

    Abstract

    To achieve higher strength and good hardenability and at the same time use the positive effects of thermomechanical controlled processing, the concept of Nb and Ti microalloyed steels is increasingly used for high-strength low-alloy (HSLA) steels with higher C contents. Herein, how the addition of Ti affects the grain growth and static recrystallization behavior of a Nb microalloyed HSLA steel with a C content of 0.23 wt% is investigated. For this reason, alloys with varying Ti and constant Nb content are produced and investigated by means of annealing and double-hit deformation experiments. Atom probe tomography measurements reveal that the Nb concentration in the matrix decreases with increasing Ti content. Therefore, the static recrystallization behavior is steadily inhibited with decreasing Ti content, as more dissolved Nb is available for the formation of strain-induced NbC precipitates. The annealing experiments show that the combined addition of Ti and Nb is most effective against grain coarsening, regardless of whether the Ti content is 90 or 180 ppm. To use the positive properties of Ti against grain coarsening and Nb to inhibit recrystallization, a middle content must be chosen when alloying Ti to HSLA steels with higher C content.

    OriginalspracheEnglisch
    Aufsatznummer2200094
    Seitenumfang8
    FachzeitschriftSteel research international
    Jahrgang93.2022
    Ausgabenummer5
    Frühes Online-Datum17 März 2022
    DOIs
    PublikationsstatusVeröffentlicht - 30 März 2022

    Bibliographische Notiz

    Funding Information:
    This research was funded by Austrian BMK (846933) in the framework of the programs “Production of the future” and the “BMK Professorship for Industry”; Österreichische Forschungsförderungs GmbH (FFG:885187); and Österreichische Forschungsförderungs GmbH (FFG:873200).

    Publisher Copyright:
    © 2022 The Authors. Steel Research International published by Wiley-VCH GmbH.

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