Asymmetric Rolling of Interstitial-Free Steel Using Differential Roll Diameters. Part I: Mechanical Properties and Defor
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TRODUCTION
STEEL in sheet form continues to be in a great demand for various applications. Among them, interstitial-free (IF) steel sheet plays a major role in the
DMITRY ORLOV, Senior Researcher, is with the Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia, is currently with the Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan. Contact e-mail: [email protected] ARNAUD POUGIS, Postgraduate Student, is with the Laboratoire d’Etude des Microstructures et de Me´canique des Mate´riaux, UMR 7239, CNRS/Universite´ de Lorraine, Ile du Saulcy, 57045 Metz Cedex 01, France, and also with the Laboratory of Excellence ‘‘DAMAS’’: ‘Design of Alloy Metals for low-mAss Structures’, Universite´ de Lorraine - Metz. RIMMA LAPOVOK, Associate Professor (Research), is with the Centre for Advanced Hybrid Materials, Department of Materials Engineering, Monash University. LASZLO S. TOTH, Professor, is with Laboratoire d’Etude des Microstructures et de Me´canique des Mate´riaux, UMR 7239, CNRS/Universite´ de Lorraine, and also Director with the Laboratory of Excellence ‘‘DAMAS’’: ‘Design of Alloy Metals for low-mAss Structures’, Universite´ de Lorraine - Metz. ILANA B. TIMOKHINA, Senior Research Academic, and PETER D. HODGSON, Director, are with the Institute for Frontier Materials, GTP Research, Deakin University, Geelong Waurn Ponds Campus, Geelong Technology Precinct Geelong, VIC 3217, Australia. ARUNANSU HALDAR, Manager (Research, Development and Technology) and DEBASHISH BHATTACHARJEE, Director (Research, Development and Technology), are with the R&D Division, Tata Steel Europe, 30 Millbank, London SW1P 4WY, UK. Manuscript submitted October 10, 2012. Article published online May 23, 2013 4346—VOLUME 44A, SEPTEMBER 2013
markets for car body panels and a variety of consumer products. However, increasing competition from other materials targeting weight and manufacturing cost reduction makes it important to find a cost-effective way to simultaneously improve both deep drawability and strength of IF steel sheet. Despite the significant optimization of thermo-mechanical processing,[1–3] the conventional symmetric rolling process (SR) used for the production of IF steel sheets cannot be improved further to generate the required increased levels of these properties. In the meantime, it has been shown that methods based on the severe plastic deformation (SPD) approach can create ultrafine-grained microstructures with significantly improved mechanical properties.[4] One such process—which does not exactly belong to the group of well-known SPD methods, but employs similar principles—is asymmetric rolling (ASR). ASR, as shown by several studies, e.g., in References 5 through 10, is an alternative process to introduce more deformation in the form of simple shear (the main characteristic of SPD processing) through the thickness of a sheet. Shear deformation is introduced into the sheet by an asymmetry of the processing conditions applied on t
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