Abdalla, Antonio JorgeDe Moura Neto, CarlosHashimoto, Tomaz Manabu [UNESP]Monteiro, Waldemar Alfredo2014-05-272014-05-272001-12-01SAE Technical Papers.http://hdl.handle.net/11449/66705In this work five methods of heat treatments are investigated in order to obtained convenient volume fractions of ferrite, bainite, martensite and retained austenite, starting with a low carbon steel and seeking the distinction of the phases, through optical microscopy. Specific chemical etching is improved. The results in tensile and fatigue tests were accomplished and the results were related with the microstructural parameters. The results show that the mechanical properties are closely related with the phases, grains size and the phases morphology. Copyright © 2001 Society of Automotive Engineers, Inc.engmechanical propertiesmicrostructuremultiphase steelChemical etchingMicrostructural parametersMultiphase microstructureMultiphase steelRetained austeniteFatigue testingLow carbon steelMicrostructureOptical microscopyMechanical propertiesOptimization of the mechanical properties of low-carbon steels by formation of a multiphase microstructureTrabalho apresentado em evento10.4271/2001-01-3872Acesso aberto2-s2.0-848775228361868573083430307