Austenitic grain refinement in as cast HSLA steels by dynamic recrystallization

Noriki Fujita, Takayuki Narushima, Yasutaka Iguchi, Chiaki Ouchi

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Grain refinement of as cast austenite by dynamic recrystallization in HSLA steels was studied by using a hot working simulator. The hot compression and tensile specimens were prepared from 0.14%C-1.45%Mn and 0.018%Ti or 0.078%Zr bearing steels. Variations of the true stress-true strain curve and dynamically recrystallized grain size with the deformation temperature, strain rate and the initial γ grain size were investigated by hot compression test. The direct hot deformation experiment after levitation melting and solidification was conducted by using the tensile specimens, where the C-Mn and 0.018%Ti-bearing steels were reheated in the temperature range from 1743 K to 1773 K, cooled by various cooling rates, and then hot deformed by tensile strain at 1423 K to 1523 K. It was confirmed that dynamically recrystallized grain size was determined simply by steady state flow stress or Zener-Hollomon parameter, but was not influenced by the initial grain size. The very coarse γ grain size with an order of mm was much refined down to 90 to 150 μm by dynamic recrystallization.

Original languageEnglish
Pages (from-to)1095-1100
Number of pages6
JournalMaterials Science Forum
Volume426-432
Issue number2
DOIs
Publication statusPublished - 2003
EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
Duration: 2003 Jul 72003 Jul 11

Keywords

  • As cast microstructure
  • Dynamic recrystallization
  • Grain refinement
  • HSLA steel
  • Inline rolling
  • Levitation melting
  • Strand casting

ASJC Scopus subject areas

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

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