Simulation of Isothermal Austenite Transformation in Steel

Yudin, Yu.V.; Куклина, А. А.; Lebedev, P. D.; Майсурадзе, М. В.

doi:10.3103/s0967091218100133

Cited by 3 publications

(2 citation statements)

References 16 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

View full text Add to dashboard Cite

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The Features of Bainite Transformation in Alloyed Steels

Yudin

Майсурадзе

Lebedev

2020

IOP Conf. Ser.: Mater. Sci. Eng.

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The main factors affecting the kinetics of isothermal bainite transformation in alloyed steels were determined using the algorithms of the computer modelling of phase transformations in the solid state. The experimental and calculated transformation kinetics was described and compared using well known Kolmogorov-Johnson-Mehl-Avrami (KJMA) equation and Austin-Rickett (AR) equation. The effect of the initial configuration and the nucleation rate of the new phase nuclei on the parameters of the bainite transformation was analysed. The calculated kinetics of phase transformation at different nucleation rates was compared with the experimentally observed for HY-TUF and D6AC steels. The mechanism of the bainite transformation in alloyed steels was explained.

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STRUCTURE AND PROPERTIES OF THE NITROGENATED LAYER OF X40CrMoV5-1-1 STEEL OBTAINED IN THE ION-PLASMA TWO-STAGE VACUUM-ARC DISCHARGE

Deyneko,

Stolbovyy,

Romanova

et al. 2024

Problems of Atomic Science and Technology

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In the production of pipes from corrosion-resistant steels on tube rolling mills, a relevant problem is the low durability of the pipe tooling. Therefore, the creation of high-performance and durable tools is primarily associated with obtaining and processing materials capable of withstanding harsh working conditions. The paper analyzes the structure and properties of the nitrogenated layer formed on the surface of the stamping tool made of X40CrMoV5-1-1 steel using the ion-plasma nitriding technology in a two-stage vacuum-arc discharge, aimed at improving the wear resistance of the pipe pressing tool. The article proposes, substantiates, and calculates a mathematical model of microhardness distribution with depth of the diffusion layer based on the Kolmogorov-Johnson-Mehl-Avrami equation, which takes into account phase transformations associated with reaction diffusion processes during nitriding. An analysis of the thermodynamic stability of nitride diffusion zones responsible for improving the wear resistance of the tool is provided.

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Simulation of Isothermal Austenite Transformation in Steel

Cited by 3 publications

References 16 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

The Features of Bainite Transformation in Alloyed Steels

STRUCTURE AND PROPERTIES OF THE NITROGENATED LAYER OF X40CrMoV5-1-1 STEEL OBTAINED IN THE ION-PLASMA TWO-STAGE VACUUM-ARC DISCHARGE

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