Partial equilibrium prediction of solidification and carbide precipitation in Ti-added high Cr cast irons

Hongwei Zhang, Qiang Liu, Hiroyuki Shibata, Qiang Wang, Pär Jönsson, Jicheng He, Keiji Nakajima

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    Carbide precipitation and eutectic phase transformation during solidification of Fe-C-Cr-Ti-Mn-Mo-Ni- Si Ti-added high-chromium cast irons (HCCIs) were studied numerically and experimentally by the help of Partial Equilibrium approximation, DSC thermal analyses and EDX analyses. The main carbides formed during the solidification are distinguished as MC, primary M7C3 and eutectic M7C3 from their distinguished constitution, while other researchers didn't distinguish the primary and eutectic M 7C3carbide. Through comparing the prediction of Partial Equilibrium approximation with DSC thermal analysis measurement, the precipitation sequence of the eutectic structure in HCCIs is clarified to follow the sequence of FCC prior to the eutectic M7C3, although they were usually expected to precipitate simultaneously. The hardness index of the HCCIs is evaluated quantatively by summation of the contributions of the Vickers hardness of MC, primary M7C3 and eutectic M 7C3 carbides with predicted precipitation amount and composition / constitution. The effects of C, Ti and Cr contents on the precipitation sequence, the amount and the composition of carbides as well as the hardness of the HCCIs are discussed deeply. Finally, the validity of Partial Equilibrium approximation is shown in prediction of the solidification in multicomponent system with large amount of precipitated carbides.

    Original languageEnglish
    Pages (from-to)374-383
    Number of pages10
    JournalIsij International
    Volume54
    Issue number2
    DOIs
    Publication statusPublished - 2014 Jan 1

    Keywords

    • Carbide precipitation
    • Hardness index
    • High chromium cast irons
    • Partial Equilibrium approximation
    • Solidification path

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

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