Ultragrain refinement of plain low carbon steel by cold-rolling and annealing of martensite

R. Ueji, N. Tsuji, Y. Minamino, Y. Koizumi

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295 Citations (Scopus)

Abstract

Simple cold-rolling and annealing of martensite starting structure can produce ultrafine grained structure in carbon steel. The microstructural evolution during the process was studied in a 0.13%C steel. The ultrafine lamellar dislocation cells (LDCs) with mean thickness of 60 nm were mainly observed in a 50% cold-rolled specimen as well as the irregularly bent lamellas (IBLs) and the kinked laths (KLs). The LDCs and the IBLs had large local misorientations. The specimens annealed at temperatures from 723 to 773 K showed the multiphased ultrafine structure composed of equiaxed ultrafine ferrite grains with the mean grain size of 180 nm, nano-carbides distributed uniformly and small blocks of tempered martensite. The formation of the ultrafine grained structure was discussed from the viewpoint of characteristics of the martensite starting structure. It was concluded that the fine grained structure of martensite play an important role for ultrafine grain subdivision during plastic deformation.

Original languageEnglish
Pages (from-to)4177-4189
Number of pages13
JournalActa Materialia
Volume50
Issue number16
DOIs
Publication statusPublished - 2002 Sep 20

Keywords

  • Annealing
  • Cold working
  • Martensite
  • Microstructure
  • Steels

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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