Simulation of backup rolls quenching with experimental study of deep cryogenic treatment

Krot, Pavlo; Bobyr, Sergey; Dedik, Maxim

doi:10.1504/ijmmp.2017.091105

Cited by 8 publications

(4 citation statements)

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“…where n α0 is the amount of martensite that is formed in the absence of stresses in the γ-phase. This quantity can be calculated using the Coetin -Marburger formula, 34 or using the more accurate formula proposed in: 35…”

Section: Research Resultsmentioning

confidence: 99%

Analytical models of austenite transformation in steels taking into account internal stresses

Sv¹

2020

MSEIJ

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Section: Research Resultsmentioning

confidence: 99%

Analytical models of austenite transformation in steels taking into account internal stresses

Sv¹

2020

MSEIJ

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“…n α = n α0 + L 12 σ γ , (13) где n α0 -количество мартенсита, которое образуется при отсутствии напряжений в γ-фазе. Это количество может быть рассчитано по формуле Коэйтина -Марбургера [34], или по более точной формуле, предложенному в работе [35]:…”

Section: современное состояние вопросаunclassified

Analytical models of austenite transformation in steel with allowance for internal stresses

Bobyr¹

2018

Fund.Appl.Probl.F.Met

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The aim of the work is to review the analytical models of austenite decay, taking into account the internal stresses obtained by various authors. It is shown that a common drawback of the known works is the neglect of the effect of the stress-strain state arising during the heat treatment of parts on the kinetics of structural transformations, while the available experimental data indicate a significant effect of stresses and strains on structural transformations. It has been established that the experimental data accumulated to date do not allow reliably describing the effect of the stress state on structural transitions during the heat treatment of steels for the hot deformation tool. A simple theoretical expression is proposed for calculating the amount of martensite formed as a function of the voltage in the γ phase. It is theoretically shown that taking into account the voltage acting in the γ phase leads to an increase in the temperature of the end of the formation of martensite. Experimental study of this effect is especially convenient to carry out in isothermal conditions under uniaxial tension. It is shown that in order to reliably predict the structural state of the hot deformation tool during heat treatment, it is necessary to conduct a comprehensive study related to the experimental study of the effect of stresses on all types of transformations and the creation of an adequate mathematical model of austenite decomposition based on the obtained experimental data.

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“…It is well known that deep cryogenic treatment (DCT) can significantly increase the properties of alloy steels [8][9][10][11]; thus, it is used as a final treatment for many technologies and industries, such as materials science [12,13], tool and steel industries [14][15][16][17][18], manufacturing of rolls [19], and automotive industry [20]. This process uses sub-zero temperature, below −125 • C, which is created by liquid nitrogen [18], as the preferred cooling medium.…”

Section: Introductionmentioning

confidence: 99%

Increasing the Wear Resistance of Structural Alloy Steel 38CrNi3MoV Subjected to Isothermal Hardening and Deep Cryogenic Treatment

Bobyr,

Krot,

Parusov

et al. 2023

Applied Sciences

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In the production of critical parts for various machines and mechanisms, expensive structural steels are used alloyed with chromium, nickel, molybdenum, and vanadium. In practice, the wear resistance of parts, especially under severe operating conditions, may be insufficient due to uneven microstructure and the content of retained austenite. Therefore, increasing the operational stability of various products made of alloy steels is an important task. The purpose of this work is to investigate the effect of isothermal hardening from the intermediate (γ+α)-area and the duration of deep cryogenic treatment on the structure formation and frictional wear resistance of 38CrNi3MoV steel. The isothermal hardening promotes the formation of the required multiphase microstructure of 38CrNi3MoV steel. The influence of the duration of deep cryogenic treatment on the microhardness, amount of retained austenite, fine structure parameters, and friction wear of 38CrNi3MoV steel are established. Complex heat treatment of 38CrNi3MoV steel, according to the proposed mode, makes it possible to achieve a significant decomposition of retained austenite to martensite, which leads to an increase in frictional wear resistance of ~58%.

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Simulation of backup rolls quenching with experimental study of deep cryogenic treatment

Cited by 8 publications

References 0 publications

Analytical models of austenite transformation in steels taking into account internal stresses

Analytical models of austenite transformation in steels taking into account internal stresses

Analytical models of austenite transformation in steel with allowance for internal stresses

Increasing the Wear Resistance of Structural Alloy Steel 38CrNi3MoV Subjected to Isothermal Hardening and Deep Cryogenic Treatment

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