Describing the isothermal bainitic transformation in structural steels by a logistical function

Yudin, Yu.V.; Майсурадзе, М. В.; Куклина, А. А.

doi:10.3103/s0967091217030160

Cited by 12 publications

(10 citation statements)

References 23 publications

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“…It is also true for temperatures of 300-500 °С. As mentioned before, the dependence of volume fraction vs. time was similar for middle-carbon steels [24][25][26]. The absolute elongation tends to reduce on dilatometric curves in the given interval as the phase transformation is complete.…”

Section: Materials and Methods Of Investigationsupporting

confidence: 71%

“…Simulating the bainite transformation kinetics [24][25][26], it has been revealed that JMAK-type models fail to provide an appropriate explanation to this transformation and the authors suggested using the logistic function as an alternative. The work [27] has presented an improved model characterizing the formation of bainite structures under the isothermal heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of phase transformations in high carbon pearlite steel at various cooling rates

Невский¹,

Кормышев²,

Simonov³

et al. 2020

cisisr

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The paper reports on the experimental research into the austenite decomposition in high carbon steel at a constant temperature and rates of cooling. The study was carried out by the methods of dilatometry, micro-durometry, optical and scanning microscopy. From the dilatometric curves it is apparent they are sufficiently presented by the Kolmogorov-Avrami equation in a temperature range from 700 to 550 °С, and by the logistic function for temperatures ranging 500 to 250 °С. The data of the dilatometric analysis were used to draw isothermal and continuous cooling transformation diagrams of phase conversions. It has been pointed out an isothermal diagram to comprise four C-curves of pearlite and bainite transformations, which are approximated by second- and third-degree polynomials. The critical temperatures of austenite, bainite, and martensite transformations have been determined, being 711, 550 and 196 °С, respectively. Considering the data obtained experimentally, a mathematical model of austenite decomposition has been developed for a constant cooling rate, and volume fractions of structure-phase components estimated theoretically, demonstrating the congruence with experimental results. The suggested mathematical model can be adopted to calculate a structure-phase composition in industrial differential heat treatment of rails. The authors are grateful to Vladimir Sarychev, Egor Polevoy and Victor Gromov who took an active part in the preparation of the manuscript. This work is supported by the Russian Foundation for Basic Research (RFBR) [project number 19-32-60001] and President grant for State Support to young researches [grant number МK-118.2019.2].

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Section: Materials and Methods Of Investigationsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Simulation of phase transformations in high carbon pearlite steel at various cooling rates

Невский¹,

Кормышев²,

Simonov³

et al. 2020

cisisr

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“…The analysis of the experimental isothermal bainite transformation kinetics (Fig. 4) was performed using the logistical equation ( 2) [19,20]:…”

Section: Solidmentioning

confidence: 99%

Microstructure of the Heat Treated Advanced Low Carbon Steel

Майсурадзе

Рыжков

Лебедев

2021

SSP

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The microstructure of the advanced low carbon steel with a superior hardenability was studied. The steel contained the following main alloying elements, wt. %: C – 0.20; Cr – 2.0; Mn – 2.0; Si – 1.04 Ni – 1.0; Mo – 0.3. The dilatometer investigation of the steel under consideration revealed the only phase transformation occurring during continuous cooling (0.1...30 °C/s), which started at the martensite start temperature Ms. It was shown that the isothermal treatment of the studied steel led to the bainite formation above and below Ms. The temperature of the bainite morphology shift was determined.

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“…Some researchers [23,24] The Ural school-seminar of metal scientists-young researchers For example, when the logistic Eq. 4 [17] is used to analyze the same experimental and simulated transformation kinetics the resulting logarithmic plots do not have any inflection or other features. So the further analysis of the experimental data will be simplified and the wrong conclusions concerning the change of the transformation 'mode' will be avoided.…”

Section: Somewhat Different Transformation Kinetics Was Observed Whenmentioning

confidence: 99%

Application of Computer Simulation to Study the Features of the Austenite Isothermal Transformation in Steels

Yudin¹,

Майсурадзе²,

Куклина³

et al. 2019

KEG

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An algorithm was developed for the simulation of a phase transition in solid state whichmakes it possible to obtain the kinetic curves of transformation under different initialconditions (the number and arrangement of new phase nuclei, the distance betweenthe nearest nuclei). The simulation results were analyzed using the Kolmogorov-Johnson-Mehl-Avrami equation and the corresponding coefficients were determined.The correlation between the simulation results and the experimental kinetics of theaustenite isothermal transformation in alloyed steels was shown.

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Describing the isothermal bainitic transformation in structural steels by a logistical function

Cited by 12 publications

References 23 publications

Simulation of phase transformations in high carbon pearlite steel at various cooling rates

Simulation of phase transformations in high carbon pearlite steel at various cooling rates

Microstructure of the Heat Treated Advanced Low Carbon Steel

Application of Computer Simulation to Study the Features of the Austenite Isothermal Transformation in Steels

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