Study of the kinetics of the recrystallization of cold-rolled low-carbon steel

Torres, C.E. Rodrı́guez; Sánchez, F.; González, Antonio Bueno; Actis, F.A.; Herreara, R.

doi:10.1007/s11661-002-0003-y

Cited by 24 publications

(15 citation statements)

References 18 publications

(23 reference statements)

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“…Torres et alii (Torres et al, 2002) mostraram que a energia de ativação aparente durante a recristalização isócrona de um aço baixo carbono laminado a frio diminuiu de 520 para 259 kJ/mol quando a taxa de aquecimento era aumentada. Singh et alii (Singh et al, 2007) modelaram a transformação não isotérmica da austenita em ferrita em aços baixo carbono e mostraram que a energia de ativação aparente diminuiu quanto era aumentada a taxa de resfriamento.…”

Section: Resultados E Discussõesunclassified

Modelagem da formação não isotérmica da austenita em um aço de baixo carbono

Almeida¹,

Dafé²,

Oliveira³

et al. 2010

Rem: Rev. Esc. Minas

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ResumoA formação da austenita em condições isócronas em um aço de baixo carbono e microligado com Nb, a diferentes taxas de aquecimento e usando curvas dilatométricas, foi estudada utilizando o modelo de Johnson-Mehl-AvramiKolmogorov (JMAK), em conjunção com a relação funcional entre a energia de ativação aparente e a taxa de aquecimento. Mostrou-se que essa relação funcional é logarítmica e que a energia de ativação aparente diminui de 152,5 para 118,1 kJ/mol, quando a taxa de aquecimento aumenta de 0,1 para 16 K/s, para o expoente n da equação de JMAK igual a 1,0. Palavras

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Section: Resultados E Discussõesunclassified

Modelagem da formação não isotérmica da austenita em um aço de baixo carbono

Almeida¹,

Dafé²,

Oliveira³

et al. 2010

Rem: Rev. Esc. Minas

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“…However, SEM of the fractured surfaces revealed the presence of some obstacles such as cavities or carbides. The general low mechanical properties of the samples annealed at 750 o C could be attributed to intense spherodization of cementite in pearlite followed by recrystallization of α -ϒ grains [12,14].…”

Section: Impact Toughness and Intercritical Annealingmentioning

confidence: 99%

Influence of Intercritical Annealing Temperature on Mechanical Properties and Microstructure of 0.23%C Low Alloy Steel

Ikpeseni¹,

Onyekpe²,

Ovri³

2015

Nig. J. Tech.

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The influence of intercritical annealing temperature on the microstructure and mechanical properties of an 0.23%C low alloy steel was undertaken in this work. The as-received steel was normalised and afterwards annealed in the (α+ϒ) region at 730 O C, 750 O C, 770 O C and 790 O C followed by quenching in hot water at about 50 O C.Mechanical testing (tensile, impact and hardness) of the annealed samples were conducted at room temperature. The fracture surfaces of the impact test samples were examined using the scanning electron microscope (SEM). Micros structural evolution of the samples was also examined with an optical microscope. The results showed that all the evaluated mechanical properties were improved by intercritical annealing, with the samples treated at 790 O C possessing the optimum combination of properties. The ultimate tensile strength (UTS), yield strength (YS), impact strength (IS), total elongation (TEL) and hardness of these samples improved by 2.7%, 13.7%, 19.7% and 31.05% respectively over the normalised sample. The microstructure photographs of the intercritically annealed samples revealed duplex structures of predominantly martensite in a ferrite matrix with little dispersions of either carbide or retained austenite, which is a typical characteristic of conventional dual phase steel.

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“…The high magnification analysis by transmission electron microscopy (TEM) can only provide the information of dislocation density to recognize recovery stage. Alternatively, various methods have been introduced for indirect monitoring of recovery and recrystallization process, correlating to the change in the bulk properties, such as tensile strength [2], hardness [3], phase intensity [4], resistivity [5], thermal enthalpy [6], magnetic coercive field [7,8] etc. Amongst these techniques, the magnetic properties are determined on the non-destructive principle with a short response of time, leading to their applications for material evaluation at remote places during material processing as well as structural health monitoring [9].…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution, recovery and recrystallization kinetics of isothermally annealed ultra low carbon steel

Dutta

Panda

Mitra

et al. 2020

Mater. Res. Express

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The recovery and recrystallization kinetics of 80% cold rolled ultra low carbon steel are investigated during isothermally annealing for temperature ranges 350-640°C as a function of different annealing time. The recovery is assessed by magnetic coercivity (Hc), while the recrystallization is determined by mechanical hardness. At low temperature (350 to 520°C) annealing, recovery dominates for long time (∼12 000 s), while the annealing at 550°C/ 900s and 580°C/ 300s causes the recrystallized nuclei formation . The recovery kinetics is introduced by differential rate equation, explaining the reduction in coercivity with the recovery progress and the variation of an activation energy from 41-113 kJ mol −1 . The recrystallization kinetics is found faster at high annealing temperature 640°C than 550 and 580°C based on hardness measurement, justifying by apparent activation energy within 114-190 kJ mol −1 . Furthermore, the recovery and recrystallization rate increase with different annealing time, consistent to the change of microstructures and grain boundary characteristics evaluated by the orientation imaging microscopy (OIM) of electron backscattered diffraction (EBSD).

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Study of the kinetics of the recrystallization of cold-rolled low-carbon steel

Cited by 24 publications

References 18 publications

Modelagem da formação não isotérmica da austenita em um aço de baixo carbono

Modelagem da formação não isotérmica da austenita em um aço de baixo carbono

Influence of Intercritical Annealing Temperature on Mechanical Properties and Microstructure of 0.23%C Low Alloy Steel

Microstructural evolution, recovery and recrystallization kinetics of isothermally annealed ultra low carbon steel

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