Thermomechanical Behavior of Work Rolls During Warm Strip Rolling
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ROLLING processes have been considered as a significant route in the production of finished and semifinished products, and accordingly, it received intensive attention in various studies in the past few decades. During this process, knowledge on macro-parameters such as temperature, strain rate, and strain are of importance in designing a proper rolling layout in both mechanical and metallurgical aspects. In this regard, various models and approaches have been developed to predict thermal and mechanical responses of rolling metal and/or work rolls.[1–18] For instance, Too[1] proposed an unsteady-state model for evaluating thermal and mechanical behaviors in multipass hot rolling processes. Liu et al.[2] studied cold rolling process using an elastic-plastic model. Pietrzyk and Lenard[3] studied single and multipass strip rolling programs under steady-state as well as non-steady-state thermal conditions. Lai et al.[4] have presented a two-dimensional (2D) thermoelastic model to determine transient thermal stresses within the work rolls. Gratacos et al.[5] predicted rolling pressure in cold rolling processes, using a 2D elastic-plastic analysis. Tseng et al.[6] conducted theoretical and experimental studies to determine thermal behavior of work rolls during hot strip rolling. Hwang et al.[7] developed a rigid-viscoplastic finite element model for evaluating thermomechanical responses of strip and work rolls in hot rolling processes. Galantucci and Tricarico[8] examined the strip and work-roll temperature variations during warm rolling process, L. KHALILI and B. KOOHBOR, Graduate Students, and S. SERAJZADEH, Professor, are with Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave., Tehran, Iran. Contact e-mail: [email protected] Manuscript submitted April 15, 2011. Article published online August 30, 2012. 1638—VOLUME 43B, DECEMBER 2012
using an elastic-plastic finite element formulation. Steady-state modeling of cold rolling was studied by Prakash et al.[9], in which pressure distribution along the strip/roll contact surface was also determined. Arif et al.[10] determined thermomechanical behavior of work rolls during cold strip rolling. It was shown that considerable temperature rise takes place within the roll material, and it can influence the stress field within the work rolls. Wang et al.[11] determined temperature and strain fields in the strip during hot rolling of low carbon steels as well as microstructural events during the process. Phaniraj et al.[12] developed a thermal-mechanical-metallurgical model to estimate temperature field and microstructural changes during hot strip rolling. Sheikh[13] proposed a coupled upper bound-finite element analysis in two dimensions for evaluating temperature distribution and required power in hot strip rolling. Serajzadeh[14] considered modeling of warm rolling of low carbon steels in which thermomechanical behavior of low carbon steel was predicted. In another study, Sonboli and Serajzadeh[15] developed a combined upper-bound finit
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