Formation of Ultrafine Ferrite by Strain-induced Dynamic Transformation in Plain Low Carbon Steel

Choi, Jin-Won; Seo, Dong Han; Lee, Jaesang; Um, Kyung-Keun; Wung-Yong, Choo

doi:10.2355/isijinternational.43.746

Cited by 142 publications

(102 citation statements)

References 14 publications

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“…One is the process where an ultrafine grained ferrite structure is formed through the phase transformation from austenite to ferrite during or after severe plastic deformations imposed on austenite. [2][3][4] It may be interpreted as a pursuit of a further development of the conventional TMCP.…”

Section: Introductionmentioning

confidence: 99%

Effect of Deformation Temperature and Strain Rate on Evolution of Ultrafine Grained Structure through Single-Pass Large-Strain Warm Deformation in a Low Carbon Steel

et al. 2004

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Ultrafine grained structure formed dynamically through a severe warm deformation in the temperature range from 773 K to 923 K has been investigated in a 0.16%C-0.4%Si-1.4%Mn steel. The effects of the deformation conditions such as deformation temperature and strain rate on microstructural evolution were examined using a single-pass compression technique with a pair of anvils. A large plastic strain up to 4 was imposed on the specimen interior at a strain rate of 1 or 0.01 s À1 . Ultrafine ferrite grains surrounded by high angle boundaries, whose nominal grain size ranged from 0.26 to 1.1 mm, evolved when the equivalent plastic strain exceeded the critical value about 0.5 to 1, and increased with an increase in strain without any large-scale migration of high angle boundaries. The effects of deformation conditions on microstructural evolution of ultrafine grained structures can be summarized into the Zener-Hollomon(Z-H) parameter dependences. The average size and the volume fraction of newly evolved ultrafine grains depend on the Z-H parameter. Decreasing Z-H parameter enhances the formation of equiaxed ultrafine grains. These indicate that the mechanism forming ultrafine grained structures through the warm severe deformation in the present study is similar to ''continuous recrystallization'' or ''in-situ recrystallization'' and that some activation process during or after the deformation plays an important role in the microstructural evolution.

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Section: Introductionmentioning

confidence: 99%

Effect of Deformation Temperature and Strain Rate on Evolution of Ultrafine Grained Structure through Single-Pass Large-Strain Warm Deformation in a Low Carbon Steel

et al. 2004

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“…DIFT could only occur when the deformation is processed between Ae3 and Ar3 [15][16][17][18] ]. In the temperature above Ae3, although deformation can increase the free energy of austenite, the deformed austenite would change to the un-deformed state through the dynamic recovery and dynamic recrystallization process because that the free energy level of un-deformed austenite is lower than that of ferrite [15] .…”

Section: Microstructurementioning

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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“…The grain size of Fe-0.17C-0.33Mn steel obtained through UFC on hot strip rolling line breaks the limitation of plain C-Mn steel to be refined through conventional TMCP (~5 μm). 13,19) It was reported that the grain size of Fe-0.14C-1.0Mn steel was ~3.4 μm, even though the cooling rate was 300°C/s and cooling temperature was low at 400°C. 16,20) Hence, ~3.3 μm can be considered to be the limit of grain size refinement in Fe-0.17C-0.33Mn steel produced through TMCP and involving UFC.…”

Section: Microstructure and Mechanical Properties Of Plain C-mn Steelmentioning

confidence: 99%

Mechanism of Microstructural Control and Mechanical Properties in Hot Rolled Plain C–Mn Steel during Controlled Cooling

Yuan

et al. 2015

ISIJ Int.

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In this study, plain C-Mn steels with different ferrite grain size were obtained through various thermomechanical processing. Fast cooling suppressed ferrite transformation at high temperature, but promoted ferrite nucleation at low temperature and restricted ferrite grain growth. The microstructure and mechanical properties were governed by the combined effects of cooling rate and cooling temperature. A new thermo-mechanical controlled processing (TMCP) based on ultra fast cooling (UFC) technology was adopted to increase the strength of plain C-Mn steel strips. The new TMCP approach involving UFC enabled significantly finer grain size to be obtained in relation to conventional TMCP. The grain size of Fe-0.17C-0.33Mn steel strips obtained by the new TMCP was refined to ~3-4 μm, and both yield strength and tensile strength were increased by 60-100 MPa over the conventional TMCP.

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Formation of Ultrafine Ferrite by Strain-induced Dynamic Transformation in Plain Low Carbon Steel

Cited by 142 publications

References 14 publications

Effect of Deformation Temperature and Strain Rate on Evolution of Ultrafine Grained Structure through Single-Pass Large-Strain Warm Deformation in a Low Carbon Steel

Effect of Deformation Temperature and Strain Rate on Evolution of Ultrafine Grained Structure through Single-Pass Large-Strain Warm Deformation in a Low Carbon Steel

Bainite Formation in Low Carbon Steel by Thermomechanical Control Process

Mechanism of Microstructural Control and Mechanical Properties in Hot Rolled Plain C–Mn Steel during Controlled Cooling

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