Granos ultrafinos por laminado acumulativo en aceros IF

MARTINA AVALOS; R. E. BOLMARO; ANA MARÍA SALCEDO GARRIDO; FRANCISCO CRUZ GANDARILLA; HÉCTOR J. DORANTES ROSALES

Santa Fe

Congreso; IBEROMAT XIII 14 SAM - CONAMET XIII Simposio Materia; 2014

In recent years the production of ultrafine-grains (UFG) by different techniques of Severe Plastic Deformation (SPD) has received more attention as thegrain refinement is considered one of the methods that can increase ductility and strength at the same time, improving the mechanical properties and itspossibilities of applications in the industry. One of the SPD processes is the method of cumulative laminate or co-laminate known as ARB (Accumulative RollBonding) that is a process for imposing severe plastic strain to metallic materials. In this technique two sheets of approximately 1 mm are laminated together in asingle rolling pass with 50% reduction, cut in two parts and laminated again, repeating the whole process several times. This method has been applied in differentaluminium alloys, copper based and interstitial free steels.The IF steels have very low interstitial elements, what confers very good deformability properties to the alloys. Its characteristics make them suitable for usein the automotive industry, so improving their properties would have great impact on the production processes.The aim of this work is to study the texture and microstructure of IF steels strained by ARB, using Electron Backscattering Diffraction (EBSD) tounderstand the fundamental mechanisms of deformation. We report information about texture components and their volume fraction, particle size,misorientations, and other data that could be associated with microstructural deformation, such as distribution of average misorientation or KAM (KernelAverage Misorientation) for different ARB cycles, with particular emphasis on the relationship between these variables and the different texture components