Modelling the temperature distribution and microstructural changes during hot rod rolling of a low carbon steel

Abstract This paper presents a mathematical model for predicting the temperature distribution and austenite microstructural changes during hot rolling of steel bars and rod. The model is based on the finite element method for evaluating the temperature distribution and Wusatowski approach to determine the strain field within the deformation zone. Also, by employing double and single hit hot compression experiments, the kinetics of dynamic and static recrystallization of a low carbon steel are determined to predict the flow stress as well as the phase changes in austenite range during and after the hot rolling process. To deal with the correlation between the metal flow and thermal behaviour and transformation kinetics of rolled metal an iterative procedure is utilized. The model is capable of predicting the effects of various process parameters such as rolling speed and interface heat transfer coefficient. A good agreement is found between the predicted results and experimental data.

[1]  C. M. Sellars,et al.  Modelling microstructural development during hot rolling , 1990 .

[2]  Peter Braun-Angott,et al.  A method for the calculation of temperature during hot rolling of bars and rod , 1993 .

[3]  John G. Lenard,et al.  The temperature, roll force and roll torque during hot bar rolling , 1999 .

[4]  Youngseog Lee,et al.  Mathematical model and experimental validation of surface profile of a workpiece in round–oval–round pass sequence , 2000 .

[5]  I. V. Samarasekera,et al.  Fundamental phenomena governing heat transfer during rolling , 1993, Metallurgical and Materials Transactions A.

[6]  J. K. Brimacombe,et al.  Heat transfer in the hot rolling of metals , 1995 .

[7]  M. Lusk,et al.  On the rule of additivity in phase transformation kinetics , 1997 .

[8]  S. I. Oh,et al.  Application of Three Dimensional Finite Element Analysis to Shape Rolling Processes , 1990 .

[9]  Ettore Anelli,et al.  Application of Mathematical Modelling to Hot Rolling and Controlled Cooling of Wire Rods and Bars , 1992 .

[10]  R. Shivpuri,et al.  Simulation of Square-to-Oval Single Pass Rolling Using a Computationally Effective Finite and Slab Element Method , 1992 .

[11]  P. Buessler,et al.  A Review on Theoretical Analyses of Rolling in Europe , 1991 .

[12]  R. Colás.  High temperature deformation of low carbon steels , 1990 .

[13]  Zygmunt Wusatowski,et al.  Fundamentals of rolling , 1969 .

[14]  Y. Bergström,et al.  A dislocation model for the stress-strain behaviour of polycrystalline α-Fe with special emphasis on the variation of the densities of mobile and immobile dislocations , 1970 .

[15]  S. Serajzadeh,et al.  An investigation on the effect of carbon and silicon on flow behavior of steel , 2002 .