scholarly journals Kinetics of austenite formation during continuous heating in a low carbon steel

2007 ◽  
Vol 58 (3) ◽  
pp. 256-261 ◽  
Author(s):  
F.L.G. Oliveira ◽  
M.S. Andrade ◽  
A.B. Cota
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Continuous Heating ◽  
Austenite Formation ◽  
Low Carbon ◽  
Kinetics Of

scholarly journals A study of isochronal austenitization kinetics in a low carbon steel

2014 ◽  
Vol 67 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Maximiano Maicon Batista Lopes ◽  
André Barros Cota
Keyword(s):  
Carbon Steel ◽  
Heating Rate ◽  
Low Carbon Steel ◽  
Carbon Diffusion ◽  
Austenite Formation ◽  
Low Carbon ◽  
Heating Rates ◽  
Initial Microstructure ◽  
Ferrite Structure ◽  
Kinetics Of

The austenite formation under isochronal conditions in Nb microalloyed low carbon steel was studied by means of dilatometric analysis and the data was adjusted to the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation, for different heating rates and for three initial microstructures. It was shown that the kinetics of austenitization of a pearlite+ferrite structure is faster than that of martensite (tempered martensite) at a heating rate of 0.1ºC/s. For heating rates higher than 0.1ºC/s, the kinetics of austenitization of a martensite structure is faster than of pearlite+ferrite one. The K parameter of the JMAK equation increases with the heating rate for the three previous microstructures and it is greater for the initial microstructure composed of ferrite+pearlite. At lower heating rates, the formation of austenite in this steel is controlled by carbon diffusion, independently of the initial microstructure. At higher heating rates, the formation of austenite from an initial microstructure composed of pearlite and ferrite is controlled by interface-controlled transformation.

Kinetics of microdamage accumulation in low-carbon steel in the initial state and after ECAP

2020 ◽  
Author(s):  
I. O. Sinev ◽  
E. N. Beletsky ◽  
M. R. Tyutin ◽  
L. R. Botvina ◽  
O. V. Rybalchenko ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Initial State ◽  
Microdamage Accumulation ◽  
Kinetics Of

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

2020 ◽  
Vol 7 (1) ◽  
pp. 016554
Author(s):  
Siuli Dutta ◽  
Ashis K Panda ◽  
Amitava Mitra ◽  
Subrata Chatterjee ◽  
Rajat K Roy
Keyword(s):  
Carbon Steel ◽  
Microstructural Evolution ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Recrystallization Kinetics ◽  
Ultra Low Carbon Steel ◽  
Kinetics Of

Morphology of Oxide Scale and Oxidation Kinetics of Low Carbon Steel

2014 ◽  
Vol 21 (3) ◽  
pp. 335-341 ◽  
Author(s):  
Guang-ming Cao ◽  
Xiao-jiang Liu ◽  
Bin Sun ◽  
Zhen-yu Liu
Keyword(s):  
Carbon Steel ◽  
Oxide Scale ◽  
Oxidation Kinetics ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Kinetics Of

Characterization of Kinetics of Deformation-Enhanced Transformation in a Low Carbon Steel

2005 ◽  
Vol 475-479 ◽  
pp. 73-76
Author(s):  
Jun Jie Qi ◽  
Wang Yue Yang ◽  
Zu Qing Sun ◽  
X. Zhang
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Microstructural Development ◽  
Low Carbon ◽  
Transformation Kinetics ◽  
Nucleation Sites ◽  
Ferrite Nucleation ◽  
Kinetics Of ◽  
Kinetics Parameter

Quantitative characterization of microstructural development during deformation enhanced transformation in a low carbon steel was investigated on a Gleeble 1500 machine. General conclusions of the features of austenite transformation kinetics during deformation-enhanced transformation were formulated. It was shown that the process of deformation-enhanced transformation can be divided into three stages according to the characteristics of transformation kinetics: The kinetics equations of two early stages fitted well in J-M-A equation. The kinetics of the first stage obeys Cahn’s site saturation mechanism, with the value of kinetics parameter n of 4. Ferrite nucleates at austenite grain boundaries and triple points during the first stage. Kinetics of the second stage doesn’t obey Cahn’s theory, with the value of kinetics parameter n of 1-1.5, corresponding to ferrite nucleation repeatedly at areas with high stored energy in front of the ferrite/austenite interface. The kinetics doesn’t obey the law of J-M-A equation any more in the final stage, and only few nucleation sites left at this moment.

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