Hardening Mechanism in Low-Carbon Low-Alloy Steels with a Simultaneous Increase in Ductility and Fracture Toughness

P. V. Kuznetsov, V. E. Panin, N. K. Galchenko

Research output: Contribution to journalArticle

Abstract

Abstract: The paper analyzes the nucleation and growth ofbainite in low-carbon low-alloy 09Mn2Si steel doped with titaniumcarbonitride nanoparticles in impact toughness testing. The analysisshows that such particles segregate at low-angle boundaries, retardingthe formation of high-angle ones, and when impacted into the steel, theycurve the lattice and generate a new bainite phase at the curvatureinterstices. The mechanism of bainite nucleation and growth issympathetic, obeys the angular momentum conservation law, and providesthe formation of multilayered packets of bainite plates capable forunlimited thinning to sub-sub-subunits during deformation. Such bainiteplates can respond to their stress-strain state by one or anotherrotation, showing a high relaxation capacity and providing a high impacttoughness of the steel at low temperatures.

Original languageEnglish
Pages (from-to)347-353
Number of pages7
JournalPhysical Mesomechanics
Volume23
Issue number4
DOIs
Publication statusPublished - 1 Jul 2020

Keywords

  • bainite
  • High impact toughness
  • lattice curvature
  • Low-carbon low-alloy steel
  • rotation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces

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