Study of Microstructure, Tensile Properties and Texture of a High Strength Dual Phase Steel Produced by Cold Rolling and Subsequent Intercritical Annealing
Subject Areas :Hamid Ashrafi 1 * , Iman Hajiannia 2
1 - Assistant Professor, Faculty of Chemical and Materials Engineering, Shahrood University of Technology, Shahrood, Iran
2 - Department of materials engineering, Isfahan university of technology, Isfahan, Iran
Keywords: Dual Phase Steel Microstructure Tensile Properties Texture,
Abstract :
In this study, the microstructure, tensile properties, and texture of a high-strength dual-phase (DP) steel were investigated. Initially, a low-carbon steel containing manganese and silicon was produced by vacuum induction melting and then subjected to hot rolling. Subsequently, cold rolling was performed and the cold rolled sheet was intercritically annealed at a temperature of 780 °C for 360 seconds and quenched in water. The microstructure and texture of the produced steel were examined using scanning electron microscopy and electron backscatter diffraction (EBSD). Tensile properties of the produced steel were evaluated using uniaxial tensile testing. The results showed that the microstructure of the produced steel consisted of interconnected martensite islands with a volume fraction of 62% in a ferritic matrix with an average grain size of 7.1 microns. This microstructure resulted in an exceptionally high tensile strength of 1265 MPa and a tensile strength-uniform elongation balance of 13622 MPa%. Investigation of the work hardening behavior of the produced DP steel based on modified Crussard-Jaoul analysis indicated a three-stage hardness behavior. EBSD studies showed that cold rolling led to the formation of a texture consisting of strong α and moderate γ fibers. After intercritical annealing, the α fiber significantly weakened while the intensity of the γ fiber slightly increased. The main texture component in the cold rolled steel was (001)[110], while a texture close to (111)[112] was observed in the DP steel.
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