Modeling of the Hot Rolling: Towards the Industrial Applicability

Abstract:

A semi-empirical approach to the modeling of the microstructural evolution during the hot rolling of austenite including grain growth, hardening and softening has been discussed in the frame of a generalized energetic expression for related structural processes. The current concept suggests the activation energy of iron self-diffusion in austenite and its dependence upon the chemical composition of the steel for prediction of the particular phenomena. Additionally, the precipitation sequences, the size distribution, Oswald ripening and interaction with softening are also included in the model of the microstructural evolution. The simulation results are reliable to the structural evolution of the low carbon steels microalloyed with Nb and Ti during hot rolling.

• Periodical: Materials Science Forum (Volume 879)
• Pages: 954-959
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.879.954
• Online since: November 2016
• Authors: Kirill Khlopkov*, Thomas Josef Baron, Georg Paul
• Keywords: Flow Behavior, Hot Rolling, Microalloyed Steel, Microstructural Evolution, Modeling, Precipitation, Recrystallization, Softening

References

[1] C. M. Sellars, Modelling of structural evolution during hot working processes, Proc. of 7th Riso Int. Symp. on Metallurgy and Materials Science, Roskilde (1986) 167-187.

[2] A.A. Vasilyev, A.I. Rudskoy, N.G. Kolbasnikov, S.F. Sokolov and D.F. Sokolov, Physical and mathematical modeling of austenite microstructure evolution processes developing in line-pipe steels under hot rolling, Mater. Sci. Forum, 706-709 (2012).

DOI: 10.4028/www.scientific.net/msf.706-709.2836

[3] H.S. Zurob, C.R. Hutchinson, Y. Brechet, G. Purdy, Modeling recrystallization of microalloyed austenite: effect of coupling recovery, precipitation and recrystallization, Acta Mater., 50 (2002) 3077-3094.

DOI: 10.1016/s1359-6454(02)00097-6

[4] S.F. Medina and A. Quispe, Improved model for static recrystallization kinetics of hot deformed austenite in low alloy and Nb/V microalloyed steels, ISIJ Int. 41 (2001) 774-781.

DOI: 10.2355/isijinternational.41.774

[5] S.F. Medina, C.A. Hernandez, General expression of the Zener-Hollomon parameter as a function of the chemical composition of low alloyed and microalloyed steels, Acta mater., 44 (1996) 137-148.

DOI: 10.1016/1359-6454(95)00151-0

[6] Th. J. Baron, K. Khlopkov, Th. Pretorius: will be published in Material Science Forum in Proc. of MEFORM 2016 (2016).

[7] A.A. Vasilyev, S.F. Sokolov, N.G. Kolbasnikov and D.F. Sokolov, Effect of alloying on the self-diffusion activation energy in γ-Iron, Physics of the Solid State, 53 (2011) 2194-2200.

DOI: 10.1134/s1063783411110308

[8] K. Khlopkov, Ch. Schwanke, G. Paul, Precipitation in microalloyed steels during hot deformation, Proc. of 6th Int. Conferece on Modelling and Simulation of Metallurgical Processes in Steelmaking, Bardolino (2015) esuppl. 1030.