Origin of predominance of cementite among iron carbides in steel at elevated temperature

C Fang, MHF Sluiter, MA van Huis, CK Ande, HW Zandbergen

    Research output: Contribution to journalArticleScientificpeer-review

    80 Citations (Scopus)

    Abstract

    A long-standing challenge in physics is to understand why cementite is the predominant carbide in steel. Here we show that the prevalent formation of cementite can be explained only by considering its stability at elevated temperature. A systematic highly accurate quantum mechanical study was conducted on the stability of binary iron carbides. The calculations show that all the iron carbides are unstable relative to the elemental solids, alpha-Fe and graphite. Apart from a cubic Fe23C6 phase, the energetically most favorable carbides exhibit hexagonal close-packed Fe sublattices. Finite-temperature analysis showed that contributions from lattice vibration and anomalous Curie-Weis magnetic ordering, rather than from the conventional lattice mismatch with the matrix, are the origin of the predominance of cementite during steel fabrication processes.
    Original languageEnglish
    Pages (from-to)055503-1-05503-4
    JournalPhysical Review Letters
    Volume105
    Issue number5
    DOIs
    Publication statusPublished - 2010

    Keywords

    • academic journal papers
    • CWTS JFIS >= 2.00

    Fingerprint

    Dive into the research topics of 'Origin of predominance of cementite among iron carbides in steel at elevated temperature'. Together they form a unique fingerprint.

    Cite this