Influence of grain size distribution on the Hall-Petch relationship of welded structural steel

Pauli Lehto*, Heikki Remes, Tapio Saukkonen, Hannu Hänninen, Jani Romanoff

*Tämän työn vastaava kirjoittaja

    Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

    139 Sitaatiot (Scopus)
    217 Lataukset (Pure)

    Abstrakti

    The strength of polycrystalline metals increases with a decrease in grain size according to the Hall-Petch relationship. However, heterogeneous microstructures deviate from this relationship depending on the distribution of grain sizes. This paper introduces a rule of mixtures based approach for determining the characteristic length of the microstructure for heterogeneous weld metal. The proposed grain size parameter, the volume-weighted average grain size, is measured experimentally for nine structural steel weld metals and two base materials. The weld metals are found to have a large variety of grain size distributions that are noticeably broader than those of the base material due to differences in phase contents. The results show that the volume-weighted average grain size is able to capture the influence of grain size distribution on the strength of welded structural steel. Based on the experimental results, a modified Hall-Petch relationship is formulated for the strength prediction of heterogeneous microstructures. The modified relationship is also found to be applicable to data from the literature.

    AlkuperäiskieliEnglanti
    Sivut28-39
    Sivumäärä12
    JulkaisuMATERIALS SCIENCE AND ENGINEERING A: STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
    Vuosikerta592
    DOI - pysyväislinkit
    TilaJulkaistu - 13 tammik. 2014
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

    Sormenjälki

    Sukella tutkimusaiheisiin 'Influence of grain size distribution on the Hall-Petch relationship of welded structural steel'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.

    Siteeraa tätä