Effects of Ni and Mn on brittle-to-ductile transition in ultralow-carbon steels

Masaki Tanaka, Kenta Matsuo, Nobuyuki Yoshimura, Genichi Shigesato, Manabu Hoshino, Kohsaku Ushioda, Kenji Higashida

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)

    Abstract

    The temperature dependence of the effective stress indicated that both Ni and Mn induce solid solution softening at low temperatures. The activation energy for dislocation glide was obtained from the temperature dependence of the activation volume and effective shear stress. Either Ni or Mn decreases the activation energy for dislocation glide, which suggests that both Ni and Mn decrease the brittle-to-ductile transition (BDT) temperature. However, the temperature dependence of the absorbed energy for fracture showed that the transition temperature decreases with Ni but increases with Mn. Fracture surfaces tested at 100 K indicated transgranular fracture at 2 mass% Ni and intergranular fracture at 2 mass% Mn, which suggests a decrease in energy for grain boundary fracture with Mn. The mechanism behind the opposite effects of Ni and Mn on the transition temperature of ultralow-carbon steels was examined on the basis of dislocation shielding theory.

    Original languageEnglish
    Pages (from-to)370-375
    Number of pages6
    JournalMaterials Science and Engineering A
    Volume682
    DOIs
    Publication statusPublished - Jan 13 2017

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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