New concepts for ultra refinement of grain size in Super Metal Project

Niikura, Masakazu; Fujioka, M.; Adachi, Yoshitaka; Matsukura, A; Yokota, Tomoyuki; Shirota, Yoshiyasu; Hagiwara, Yukito

doi:10.1016/s0924-0136(01)00800-7

Cited by 52 publications

(27 citation statements)

References 2 publications

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“…On the other hand, it was recently shown that several thermomechanical processing routes successfully produce low-carbon steels consisting of ultrafine-grained ferrite structure whose grain size is finer than 1 mm in a bulk form Ref. 3). Those studies are mostly exploring the limit in conventional controlled rolling processes, i.e., lower deformation temperature and heavier deformation of metastable austenite before or during ferrite transformation.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation from Fine-grained Austenite

Furuhara¹,

et al. 2008

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Section: Introductionmentioning

confidence: 99%

Phase Transformation from Fine-grained Austenite

Furuhara¹,

et al. 2008

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“…1,2) The research works in project clarified the fact that, in order to manufacture UFGS sheets through hot rolling, large amount of strain energy should be added to the sheets by means of high thickness reduction rolling at comparatively low temperature. Large strain energy would activate re-crystallization and low temperature would constrain grain growth, as the result, ferrite grains might be refined to ultra-fine.…”

Section: Process Design For Manufacturing Of Ufgs Sheetsmentioning

confidence: 99%

Integrated Production Technologies for Ultra-fine Grained Steel Sheets

Kiuchi

2008

ISIJ Int.

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A national project was conducted by NEDO and executed by a consortium organized by JRCM with aims to develop integrated production technologies necessary for manufacturing ultra-fine grained steel (UFGS) sheets. In the project, the diverse technologies were concurrently developed relating with (1) high-speed large-reduction semi-continuous hot forging, (2) high-speed short-interval hot tandem rolling, (3) multi-cycle hot bending for strain accumulation, (4) high-strength anti-wear rolls, (5) multi-functional lubricants, (6) mathematical modeling and simulation of ultra-fine grain generation and (7) joining of UFGS sheets. The project succeeded in building up the integration of advanced technologies available for overall steel sheets manufacturing as well as production of UFGS sheets. Utilizing the developed technologies, UFGS sheets of plain low carbon steel having 1.0-2.0 mm thickness, 300 mm width, 1.0 mm grain diameter and 600-700 MPa tensile strength were successfully manufactured and found assuredly formable to practical products.

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“…Deformation induced ferrite transformation (DIFT) theory has been accepted to produce ultrafine grained low carbon steels [6][7][8][9] . However, high strength steels with ultra-fine ferrite grains are not quite satisfactory in some aspects, e.g.…”

Section: Introductionmentioning

confidence: 99%

Bainite Formation in Low Carbon Steel by Thermomechanical Control Process

Li¹

2017

dtetr

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ABSTRACT.1 Continuous cooling transformation (CCT) behavior of plain low carbon steel was investigated. Based on the obtained results, allotriomorphic ferrite and high volume fraction of bainite structure has been obtained by controlled deforming in the finish rolling temperature (higher than Ae3) and controlled cooling. The formation of bainite would lead to an enhanced strength of the low carbon steel and the steel possesses a good combination of strength and ductility.

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New concepts for ultra refinement of grain size in Super Metal Project

Cited by 52 publications

References 2 publications

Phase Transformation from Fine-grained Austenite

Phase Transformation from Fine-grained Austenite

Integrated Production Technologies for Ultra-fine Grained Steel Sheets

Bainite Formation in Low Carbon Steel by Thermomechanical Control Process

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