Diffusion-controlled recrystallization and grain growth-induced plasticity of steel under externally applied stress

Han, Heung Nam; Kim, Se Jong; Kim, Miyoung; Kim, Gyosung; Suh, Dong‐Woo; Kim, Sung-Joon

doi:10.1080/14786430802320119

Cited by 16 publications

(11 citation statements)

References 26 publications

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“…The volume fraction of the statically transformed phase in the SIDT specimen was determined by applying the lever rule [17][18][19][20][21][22] to the dilatation curves, as shown in Fig. 2.…”

Section: Resultsmentioning

confidence: 99%

Identification of dynamic ferrite formed during the deformation of super-cooled austenite by image-based analysis of an EBSD map

et al. 2011

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Differentiation of dynamically and statically transformed ferrites in SIDT (Strain-Induced Dynamic Transformation) steel was carried out by various image-based analyses of EBSD (Electron BackScattered Diffraction) maps. Various identification methods were tried on the basis on the grain size, and the intra-and inter-granular misorientations. The grain-size-based method was valid only when a bimodal grain size distribution in the ferrite phase, due to the large prior austenite grain size, appeared in the specimen. On the other hand, using the proposed method based on both intra-and inter-granular misorientations, the dynamically transformed ferrite could be effectively extracted from SIDTed steel, even in steel in which the grain sizes of the dynamically and statically transformed ferrites were alike.

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Section: Resultsmentioning

confidence: 99%

Identification of dynamic ferrite formed during the deformation of super-cooled austenite by image-based analysis of an EBSD map

et al. 2011

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“…The parameters in Eq. [9] of the vacancy volume (X), the effective thickness of the interface (d), and the formation enthalpy of the vacancy at the interface (Q f ) were taken to be 1.21 9 10 À29 m 3 , [37] 1 nm, and 80 kJ/ mol, [23,38] respectively. The constant c v0 was adjusted by using the constrained Rosenbrock technique [39] as an optimization procedure, which was done while changing the constants systematically until the sum of the squared differences between the experimental and calculated data reached a minimum.…”

Section: Transformation Plasticitymentioning

confidence: 99%

A Finite Element Modeling for Dilatometric Nonisotropy in Steel

Cho

Lee

et al. 2011

Metall Mater Trans A

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It is well known that nonisotropic volume changes in dilatometry were observed during the phase transformation in steel. In this study, a finite element (FE) model incorporating the transformation plasticity was adopted to describe the nonisotropic dilatometric behavior during the phase transformation in steel. An implicit numerical solution procedure to calculate the deformation during the dilatometric experiment was incorporated into the general purpose implicit FE program. The nonisotropic dilatometric behavior could be successfully reproduced by using the FE simulation considering the transformation plasticity. The transformation plasticity was caused by the small amount of stress that naturally developed in the specimen during the dilatometric experiment. In conventional low carbon steel, the stress in the specimen mainly forms due to the very small external force supplied to support it during the dilatometric experiment. As regards ultralow carbon steel, whose phase transformation occurs within an extraordinarily narrow temperature range, the inhomogeneous phase transformation due to the temperature deviation in the specimen was mainly responsible for the stress field in the specimen during the dilatometric experiment.

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“…Han and Suh (2003) and Han et al (2004) developed a microstructure-based model using the Kurdjumov-Sachs (KS) orientation relationship between fcc and bcc to interpret the transformation plasticity phenomenon during the displacive transformation under an applied external stress. Recently, Han et al (2007Han et al ( , 2008 suggested a constitutive equation for the transformation plasticity based on the diffusion mechanism of the migrating interface during the diffusional phase transformation, which can be described as accelerated Coble creep. The constitutive equation for transformation plasticity was incorporated into a general purpose implicit finite element (FE) program.…”

Section: Introductionmentioning

confidence: 99%

A finite element analysis for asymmetric contraction after coiling of hot-rolled steel

Cho¹,

Cho²,

Im³

et al. 2010

Journal of Materials Processing Technology

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Diffusion-controlled recrystallization and grain growth-induced plasticity of steel under externally applied stress

Cited by 16 publications

References 26 publications

Identification of dynamic ferrite formed during the deformation of super-cooled austenite by image-based analysis of an EBSD map

Identification of dynamic ferrite formed during the deformation of super-cooled austenite by image-based analysis of an EBSD map

A Finite Element Modeling for Dilatometric Nonisotropy in Steel

A finite element analysis for asymmetric contraction after coiling of hot-rolled steel

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