Modeling of the γ → α transformation in steels

Vasilyev, A.; Sokolov, D. F.; Колбасников, Н. Г.; Sokolov, S. F.

doi:10.1134/s1063783412080318

Cited by 12 publications

(9 citation statements)

References 29 publications

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“…Austenite decomposition model describes this process under continuous cooling condition for low alloyed steels with formation of all practically important structural components (ferrite, pearlite, bainite of different morphology and martesite). Physically based mathematical models of ferrite, pearlite and bainite transformations are described in [4,5].…”

Section: Austenite Microstructure Evolution Modelmentioning

confidence: 99%

Computer Model STAN 2000 and its Use in Practice of Steels Hot Rolling on Mill 2000 of Severstal

Ogoltcov¹,

Sokolov

et al. 2016

MSF

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An integral computer model/program STAN 2000 for simulation of steels hot rolling on mill 2000 of SEVERSTAL was developed. The capacity of the model includes, for example, the following features:‒ control of power parameters and prediction of hot strip temperature for a given rolling and accelerated cooling regimes;‒ follow-up of the evolution of steel microstructure at all stages of strip production and prediction of ultimate mechanical properties (yield stress, ultimate tensile stress and relative elongation);‒ optimization of rolling regimes for existing steel grades and developing them for a new ones.The STAN 2000 program is written in С++ programming language and can work on all modern Microsoft Windows family operating systems. The program has a well-designed and user-friendly interface facilitating its practical use.The integral model was calibrated using an extensive data base on rolling regimes and forces, measured temperatures and final mechanical properties for a number of steel grades rolled on mill 2000 of SEVERSTAL with chemical compositions covering the following ranges of alloying elements content (mass.%): С(≤0.65); Mn(≤2.0); Si(≤1.0); Cr(≤0.9); Ni(≤0.6); Cu(≤0.5); Mo(≤0.4); Nb(≤0.05); V(≤0.065); Ti(≤0.06); B(≤0.003).Some results of calculations performed with STAN 2000 program for temperatures, rolling forces and mechanical properties are presented and compared with experimental data. Some examples of the program utilization in hot strip production on mill 2000 of SEVERSTAL are presented and discussed.

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Section: Austenite Microstructure Evolution Modelmentioning

confidence: 99%

Computer Model STAN 2000 and its Use in Practice of Steels Hot Rolling on Mill 2000 of Severstal

Ogoltcov¹,

Sokolov

et al. 2016

MSF

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“…The model (AusTran) makes it possible to describe austenite transformation in low alloyed steels with formation of all practically important structural components (ferrite, pearlite, bainite of different morphology and martesite). Physically based models of the ferrite and pearlite transformations are described in detail elsewhere [3]. Kinetics of the martensite transformation is calculated using an empirical model from literature [4].…”

Section: Mathematical Modelsmentioning

confidence: 99%

“…Creation of a new generation of integral hot rolling models is possible when using physically justified sub-models of the separate processes of structure formation based on reliable approaches to calculation of the thermodynamic and kinetic process parameters with an accurate account of the alloying effects. A set of such sub-models, which employ new approaches to a quantitative description of the dependence of key kinetic parameters of the analyzed processes on chemical composition, was created by the authors, and was partially introduced in earlier works [2,3]. As a result of uniting the sub-models of separate processes [2] we created the model (computer program) AusEvol+, which is able to quantitatively predict the complex evolution of the microstructure of austenite during hot deformation of steel.…”

Section: Introductionmentioning

confidence: 99%

“…As a result of uniting the sub-models of separate processes [2] we created the model (computer program) AusEvol+, which is able to quantitatively predict the complex evolution of the microstructure of austenite during hot deformation of steel. We additionally developed the model (computer program) AusTran [3], which allows quantifying the austenite transformation in lowalloyed steels with formation of a set of practically important microstructural components. By joining the above-mentioned models, an integrated model has been created for predicting the microstructure and mechanical properties of steels processed in accordance with the given hot deformation and accelerated cooling regimes.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Microstructure and Mechanical Properties of Hot Rolled Steels

Sokolov

Ogoltcov

Vasilyev

et al. 2013

MSF

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An integral mathematical physically based model is developed for prediction of the microstructure and mechanical properties of steels processed in accordance with a given hot deformation and accelerated cooling regimes. The model predicts austenite microstructure evolution under hot deformation, as well as its transformation during subsequent cooling with account of formation of ferrite, pearlite, bainite and martensite. Structure-property relationships are developed using an extensive experimental database chemical composition - microstructure - mechanical properties obtained for 10 steel grades. Austenite transformation depending on grain size, cooling rate and preliminary plastic deformation was investigated with the help of Gleeble 3800 system to obtain a set of practically important morphologically different microstructures for each steel grade. A quantitative analysis of the microstructures was performed using optical and scanning electron microscopy (EBSD-method). Investigation of the mechanical properties of steels with wide spectrum of obtained microstructures was carried out on the double-samples processed using Gleeble 3800. The predicted microstructure parameters for investigated steels obtained using the developed model, as well as their mechanical properties, are in good agreement with the experimental data.

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“…A large, plate-like form of quenched martensite with a body-centered cubic (BCC) {112}〈111〉-type twin structure as its substructure is easily formed in high-carbon steels or alloys with a low M s (martensite start temperature), whereas the martensite in low-carbon steels, normally called lath martensite, has been suggested to have a dislocation structure as its lath substructure after quenching. These different substructures have resulted in the suggestion of various kinds of transition mechanisms from austenite (γ-Fe) to ferrite (α-Fe) 1 – 10 .…”

Section: Introductionmentioning

confidence: 99%

Lath formation mechanisms and twinning as lath martensite substructures in an ultra low-carbon iron alloy

Ping

Guo

Imura

et al. 2018

Sci Rep

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Lath martensite is the dominant microstructural feature in quenched low-carbon Fe-C alloys. Its formation mechanism is not clear, despite extensive research. The microstructure of an Fe-0.05 C (wt.%) alloy water-quenched at various austenitizing temperatures has been investigated using transmission electron microscopy and a novel lath formation mechanism has been proposed. Body-centered cubic {112}〈111〉-type twin can be retained inside laths in the samples quenched at temperatures from 1050 °C to 1200 °C. The formation mechanism of laths with a twin substructure has been explained based on the twin structure as an initial product of martensitic transformation. A detailed detwinning mechanism in the auto-tempering process has also been discussed, because auto-tempering is inevitable during the quenching of low-carbon Fe-C alloys. The driving force for the detwinning is the instability of ω-Fe(C) particles, which are located only at the twinning boundary region. The twin boundary can move through the ω ↔ bcc transition in which the ω phase region represents the twin boundary.

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Modeling of the γ → α transformation in steels

Cited by 12 publications

References 29 publications

Computer Model STAN 2000 and its Use in Practice of Steels Hot Rolling on Mill 2000 of Severstal

Computer Model STAN 2000 and its Use in Practice of Steels Hot Rolling on Mill 2000 of Severstal

Modeling of Microstructure and Mechanical Properties of Hot Rolled Steels

Lath formation mechanisms and twinning as lath martensite substructures in an ultra low-carbon iron alloy

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