Forecasting the mean flow stress of carbon and low-alloy steels in hot rolling on a strip mill

Shkatov, Valeriy V.; Mazur, Igor P.; Shkatov, Victor V.

doi:10.1088/1757-899x/461/1/012051

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Many authors [8][9][10][11] have used microstructure evolution models to design controlled forming regimes. Usually, however, these are models created for strip rolling on the final sequence of (semi)continuous mills at low rolling temperatures, where the SIP effect has already caused, or will soon cause, a slowing down (in the case of continuous mills with short interpass times, a practical stop) of recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Microstructure Development of Nb-Microalloyed Steel during Rolling on a Heavy-Section Mill

Sauer

Fabík²,

Schindler

et al. 2022

Materials

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It is not realistic to optimize the roll pass design of profile rolling mills, which typically roll hundreds of profiles, using physical modelling or operational rolling. The use of reliable models of microstructure evolution is preferable here. Based on the mathematical equations describing the microstructure evolution during hot rolling, a modified microstructure evolution model was presented that better accounts for the influence of strain-induced precipitation (SIP) on the kinetics of static recrystallization. The time required for half of the structure to soften, t0.5, by static recrystallization was calculated separately for both situations in which strain-induced precipitation occurred or did not occur. On this basis, the resulting model was more sensitive to the description of grain coarsening in the high-rolling-temperature region, which is a consequence of the rapid progress of static recrystallization and the larger interpass times during rolling on cross-country and continuous mills. The modified model was verified using a plain strain compression test (PSCT) simulation of rolling a 100-mm-diameter round bar performed on the Hydrawedge II hot deformation simulator (HDS-20). Four variants of simulations were performed, differing in the rolling temperature in the last four passes. For comparison with the outputs of the modified model, an analysis of the austenite grain size after rolling was performed using optical metallography. For indirect comparison with the model outputs, the SIP initiation time was determined based on the NbX precipitate size distribution obtained by TEM. Using the PSCT and the outputs from the modified microstructure evolution model, it was found that during conventional rolling, strain-induced precipitation occurs after the last pass and thus does not affect the austenite grain size. By lowering the rolling temperature, it was possible to reduce the grain size by up to 56 μm, while increasing the mean flow stress by a maximum of 74%. The resulting grain size for all four modes was consistent with the operating results.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Microstructure Development of Nb-Microalloyed Steel during Rolling on a Heavy-Section Mill

Sauer

Fabík²,

Schindler

et al. 2022

Materials

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“…The design and optimization of technologies which use models of dynamic recrystallization (DRX) and static recrystallization (SRX) during hot plastic deformation of structural steels are among the promising ways of obtaining high values of strength and plastic properties of the finished metal products. The conditions and degree of the recrystallization process development also affect the level of metal flow stress during deformation, the accuracy of which depends on the accuracy of calculating the energy parameters in metal hot forming processes [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Dynamic Recrystallization and Flow Curves Using the Kinetics of Static Recrystallization

Shkatov

Mazur

2019

Materials

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The results of modeling the dynamic recrystallization of steels during hot deformation on the basis of information on their static recrystallization kinetics are presented. The results of predicting the amount of deformation accumulated in the metal under the conditions of dynamic recrystallization development were used for calculating the metal flow curves. The model was validated by comparing the calculated flow curves with the experimental flow curves determined on the 1045 steel by means of hot torsion tests carried out from 1000 °C to 1100 °C and at strain rates from 0.1 to 10 s‒1. The difference between the experimental and predicted flow stress values did not exceed 6%. The influence of the chemical element content in low-alloyed steels on the magnitude of the critical strain for the initiation of dynamic recrystallization is assessed. The method of predicting the kinetics of dynamic recrystallization by recalculating the kinetics of static recrystallization to the conditions of continuous growth of the strain degree during metal deformation implemented in the model can be used in designing and optimizing technologies associated with metal hot forming processes.

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Left and right front-end bending of H-beams due to asymmetric rolling

Koo,

Park

2025

Construction and Building Materials

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Forecasting the mean flow stress of carbon and low-alloy steels in hot rolling on a strip mill

Cited by 3 publications

References 7 publications

Analysis of the Microstructure Development of Nb-Microalloyed Steel during Rolling on a Heavy-Section Mill

Analysis of the Microstructure Development of Nb-Microalloyed Steel during Rolling on a Heavy-Section Mill

Modeling the Dynamic Recrystallization and Flow Curves Using the Kinetics of Static Recrystallization

Left and right front-end bending of H-beams due to asymmetric rolling

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