Search for: rolling-speed
On the influence of deformation rate and cooling media on the static strain aging of a warm-rolled low carbon steel, Article International Journal of Material Forming ; Volume 6, Issue 3 , February , 2013 , Pages 417-422 ; 19606206 (ISSN) ; Ohadi, D ; Sharif University of Technology
An investigation was performed on the static strain aging behavior of warm-rolled low carbon steel during a nearly 1-year aging period, from the view point concerning with influence of changing the deformation speed and cooling media. Mechanical response of the examined material during aging period was evaluated through variations occurred in strength and hardness of the warm-deformed steel. It was shown that changing the rolling speed as well as cooling rate, may result in the occurrence of different metallurgical phenomena, consequently altering the aging kinetics of the material. It was also found that by increasing rolling speed, an increase in the value of hardness and UTS takes place,...
An experimental investigation on the deformation behavior during wire flat rolling process, Article Journal of Materials Processing Technology ; Volume 160, Issue 3 , 2005 , Pages 313-320 ; 09240136 (ISSN) ; Karimi Taheri, A ; Sharif University of Technology
In the present study a laboratory flat rolling machine is utilized to assess the deformation behavior of low and high carbon steel wires in wire flat rolling process. The effects of friction coefficient, rolling reduction and roll speed on rolling force and deformation behavior of the wires are experimentally investigated. It is found that the roll speed affects considerably the rolling force but a negligible effect on deformation behavior. It is noted that by increasing the roll speed, the rolling force may decrease or increase depending on the magnitude of the roll speed. Also, the deformation behavior of the wires in flat rolling is formulated. A relationship is developed for calculating...
Thermomechanical behavior of work rolls during warm strip rolling, Article Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science ; 2012 , Pages 1-11 ; 10735615 (ISSN) ; Serajzadeh, S ; Koohbor, B ; Sharif University of Technology
A mathematical model was developed to assess thermomechanical behavior of work rolls during warm rolling processes. A combined finite element analysis-slab method was first developed to determine thermal and mechanical responses of the strip being rolled under steady-state conditions, and then, the calculated roll pressure and temperature field were utilized as the governing boundary conditions for the thermomechanical problem of the work roll. Finally, the thermomechanical stresses within the work rolls were predicted by a thermoelastic finite element approach. The results of the model indicate that, in warm strip rolling, thermal and mechanical stresses developed in the work rolls are...
Effect of rolling speed on the occurrence of strain aging during and after warm rolling of a low-carbon steel, Article Journal of Materials Science ; Volume 45, Issue 13 , July , 2010 , Pages 3405-3412 ; 00222461 (ISSN) ; Ohadi, D ; Serajzadeh, S ; Akhgar, J. M ; Sharif University of Technology
In this study, effect of rolling speed on strain aging phenomena in warm rolling of a carbon steel has been investigated. For this purpose, by using a mathematical model and predicting temperature and strain rate fields, the possibility of occurrence of dynamic strain aging during the warm rolling was first evaluated. In the next stage, warm-rolled samples were aged up to 11 months at room temperature for studying the kinetics of static strain aging, while mechanical tests as well as microstructural evolutions have been performed to determine the effect of strain aging on material behavior. The results indicate that dynamic strain aging may not occur for the employed rolling program;...
Effects of deformation parameters on the final microstructure and mechanical properties in warm rolling of a low-carbon steel, Article International Journal of Advanced Manufacturing Technology ; Volume 34, Issue 3-4 , 2007 , Pages 262-269 ; 02683768 (ISSN) ; Mohammadzadeh, M ; Sharif University of Technology
The effects of warm rolling parameters on the final microstructure and mechanical properties of a low-carbon steel were investigated. In doing so, the steel strips were pre-heated at various temperatures and rolled at different reductions and rolling speeds. Then, microstructural studies were performed and, also, the mechanical properties of the rolled samples were measured by tensile and hardness testing. An optimum rolling program was determined with the aids of experimental results and a mathematical model based on the finite element method (FEM) developed for the warm rolling conditions. The results show that, at high temperatures and low rolling speeds, the roll forces are reduced;...
A model for evaluating thermo-mechanical stresses within work-rolls in hot-strip rolling, Article Journal of Engineering Mathematics ; Volume 72, Issue 1 , 2012 , Pages 73-85 ; 00220833 (ISSN) ; Serajzadeh, S ; Sharif University of Technology
A mathematical model is proposed for the determination of the thermo-mechanical stresses in work-rolls during hot-strip rolling. The model describes the evolution of the temperature fields in the work-roll and in the work-piece, and in the latter the plastic heat generation is taken into account. The frictional heat generated on the contact surface is also included. The problem is treated in two steps. First, a numerical method is developed for the analysis of the coupled thermal problem of the temperature distributions within the work-roll and metal being rolled, while an admissible velocity field is employed to estimate the heat of deformation. In the second step, the finite-element method...