Elena Brandaleze
National Technological University, Argentina
Title: Destabilizing phenomenon in Pearlitic cementite steels and its influence on the development of high levels of strength
Biography
Biography: Elena Brandaleze
Abstract
In this study the deformation mechanisms in steels with high carbon content (> 0.8% C) cold drawn studied. Plastic deformation phenomena promote dissolution of cementite in pearlite, achieving high strength and ductility. For this reason, these steels are used in critical applications such as cranes or support cables of suspension bridges. With the aim of studying the stability of iron carbides that impact in increasing the mechanical properties are tested to failure in torsion, two wire samples processed under the same conditions. These have different behaviour; one suffered fracture plane (normal) and a delaminated fracture. To this end, studies of optical and scanning electron microscopy (SEM) were performed. In addition, assays differential thermal analysis (DTA / DSC) and applying thermodynamic simulation FactSage to evaluate the stability of carbides are made. The results show heterogeneity between the central and peripheral zone of both wires and the presence of the phenomenon of curling (curling). Both phenomena are more pronounced in standard wire on greater plasticity. The phenomenon of precipitation of carbides epsilon diffusion of carbon in the ferrite-pearlite interface justifying increased mechanical strength is identified.