Dynamic recrystallization by large strain deformation with a high strain rate in an ultralow carbon steel

Kang, Joo‐Hee; Torizuka, Shiro

doi:10.1016/j.scriptamat.2007.07.039

Cited by 29 publications

(25 citation statements)

References 13 publications

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“…. 23) These results are similar to those obtained in previous research when the specimen was deformed by the strain of 4 at 923-1123 K. 6) Such orientation characteristics are evidence of continuous dynamic recrystallization unaccompanied by apparent nucleation. Nevertheless, a more in-depth quantitative examination on texture evolution is needed during warm deformation, including the strong texture development of (001)[110] at higher temperature.…”

Section: Resultssupporting

confidence: 87%

“…Nevertheless, a more in-depth quantitative examination on texture evolution is needed during warm deformation, including the strong texture development of (001)[110] at higher temperature. 6) Regarding the mechanism of grain refinement through severe plastic deformation, some researchers have proposed the microshear band mechanism, whereby local lattice rotation takes places at the intersection of microshear bands. 17,24) In our specimen, deformation bands inclined 20 to the RD are actively generated in h111i == ND, as shown in Figs.…”

Section: Resultsmentioning

confidence: 99%

“…A fundamental understanding of the strain effect could provide a clue to the control of the microstructure and texture in various kinds of deformation processes. 5) On the other hand, in an earlier study, 6) the microstructural change of ferrite was reported under large-strain single deformation with high strain rates by warm deformation above 923 K. A strong texture, such as h100i, h111i == ND and h110i == RD, was developed, and fine ferrite was obtained under the large strain of 4. However, the mechanism of such texture evolution differed from that of typical static recrystallization, and the deformation behavior was not thoroughly understood.…”

Section: Introductionmentioning

confidence: 85%

“…However, the mechanism of such texture evolution differed from that of typical static recrystallization, and the deformation behavior was not thoroughly understood. In order to understand the mechanism of grain refinement and texture development in regions under large strain, 3,[6][7][8] the microstructure and texture variation should be determined according to " eq . In this study, the effect of " eq on the microstructural evolution was investigated under a plane strain condition using finite element analysis (FEA) and electron backscattered diffraction (EBSD) when an ultra-low carbon steel was compressed uniaxially at 773 K.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Strain on Microstructural Evolution under Warm Deformation in an Ultra-Low Carbon Steel

2009

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The microstructural evolution was investigated according to the equivalent strain in uniaxial compression using an ultra-low carbon steel. The equivalent strain was quantitatively calculated by using finite element analysis. The microstructure was rapidly refined up to the equivalent strain of 2.4 with the material flow to rolling direction (RD) with the remarkable development of high angle boundaries. At that time, texture such as (001)[110] and (111)[110] significantly developed. Inhomogeneous deformation behavior according to texture was observed; h100i == ND was elongated without the development of subgrain even under large strain, but h111i == ND was divided into small grains isolated with high angle boundaries.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Effect of Strain on Microstructural Evolution under Warm Deformation in an Ultra-Low Carbon Steel

2009

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“…The textural evolution in a large strain was similar to the previous results of warm deformed steels. 11,12,24,25) Finally, the rotated cube f001gh110i and the fiber became the main components in " eq ¼ 3:5. Compared to the texture in the deformed specimen in a higher temperature region (923-1123 K), the rotated cube did not grow as indicated in our previous report.…”

Section: Strain Distribution Estimated By Numerical Analysismentioning

confidence: 99%

Effect of Shear Strain on the Microstructural Evolution of a Low Carbon Steel during Warm Deformation

Kang

Inoue²,

Torizuka³

2010

Mater. Trans.

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The microstructural evolution of a low carbon steel was investigated under two different conditions with and without shear strain, using electron backscattered diffraction (EBSD) when a uniaxial compression of 67% was applied at a warm working temperature of 773 K. The equivalent strain and shear strain imposed by the compression test were calculated quantitatively by finite element analysis (FEA). As the equivalent strain was increased without any shear strain, the texture of the and fibers was strongly developed, and the grain refinement was accelerated. However, as the shear strain was increased at the same equivalent strain, the thickness of the pancaked ferrite decreased and the texture was weakened. With increasing shear strain, a shear texture, such as h110i == TD and f110g == ND, was observed and a high angle boundary over 15 developed at the expense of low and medium angle boundaries below 15 . The shear strain accelerated the subdivision of the ferrite grain and randomized the texture.

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The Effect of Initial Microstructure on Microstructure Evolution and Mechanical Properties of Intercritically Rolled Low‐Carbon Microalloyed Steel Plates

Shen

Chen

et al. 2019

steel research int.

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Steel plates rolled in the intercritical region have ultrafine and elongated‐grained microstructures, and excellent toughness. The effect of the initial microstructure on microstructure evolution and the mechanical properties of intercritically rolled (IR) low‐carbon microalloyed steel plates is investigated herein. Coarse‐grained initial microstructure mainly containing lath bainite and fine‐grained initial microstructure mainly containing quasi‐polygonal ferrite are produced by austenitization treatments at different temperatures. The results show that the coarse‐grained initial microstructure restrains continuous dynamic recrystallization during intercritical rolling, which leads to a less fraction of high‐angle grain boundaries (HAGBs). However, initial microstructure has little influence on the average size of ferrite grains surrounded by HAGBs. Moreover, coarse‐grained initial microstructure results in a relatively higher strength improving about 15 MPa due to the lower fraction of HAGBs. Fine‐grained initial microstructure is beneficial to the Charpy impact toughness such that the upper shelf energy is improved from 108 to 118 J, and low‐temperature toughness is also enhanced. However, the effect of the initial microstructure on the microstructure and mechanical properties of IR rolled steel plates is not great, which indicates that coarse‐grained initial microstructure can also be used to develop this kind of steel plates with excellent toughness.

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Dynamic recrystallization by large strain deformation with a high strain rate in an ultralow carbon steel

Cited by 29 publications

References 13 publications

Effect of Strain on Microstructural Evolution under Warm Deformation in an Ultra-Low Carbon Steel

Effect of Strain on Microstructural Evolution under Warm Deformation in an Ultra-Low Carbon Steel

Effect of Shear Strain on the Microstructural Evolution of a Low Carbon Steel during Warm Deformation

The Effect of Initial Microstructure on Microstructure Evolution and Mechanical Properties of Intercritically Rolled Low‐Carbon Microalloyed Steel Plates

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