Sublattice alloy design of high-strength steels: Application of clustering and nanoscale precipitation of interstitial and substitutional solutes

Tadashi Furuhara, Yongjie Zhang, Mitsutaka Sato, Goro Miyamoto, Masanori Enoki, Hiroshi Ohtani, Tokuteru Uesugi, Hiroshi Numakura

研究成果: Article査読

抄録

Recent advances in high-strength steels for automobile applications or surface-hardened steels have attracted interest on controlling the nanoscale dispersion of alloy carbides/nitrides in ferrite. Particularly, B1-type carbide/nitride precipitation and metastable alloy clustering can be understood as the coupled ordering and compositional phase separation of interstitial alloying elements i and substitutional alloying elements s, i.e., "spinodal ordering". In this paper, the behavior of i–s clustering and alloy carbide/nitride precipitation is revealed by nanoscale characterization, theoretical calculations, and evaluations of mechanical properties. Physical measurements and density function theory-based analyses revealed that strong i–s attractive interaction is responsible for metastable i–s clustering, which clearly indicated "hidden" nanoscale inhomogeneity in solid solutions. Further, we discuss a concept termed interstitial sublattice engineering in bulk and at interphase boundary for strengthening of alloyed steels.

本文言語English
論文番号115063
ジャーナルScripta Materialia
223
DOI
出版ステータスPublished - 2023 1月 15

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学
  • 金属および合金

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