Phenomenon of destabilization of the cementite in pearlitic steels and their influence on the development of high levels of mechanical strength

International Conference and Exhibition on Materials Chemistry

March 31-April 01, 2016 Valencia, Spain

Elena Brandaleze and Mykhaylo Romanyuka

National Technological University, Argentina

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

In this paper 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 breaking twist, two wire samples processed under the same conditions. These have different behavior, one suffered fracture flat (normal) and another delaminated fracture. To this end, studies of optical and scanning electron microscopy (SEM) are made. 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 the normal wire, for its greater plasticity. The phenomenon of precipitation of carbides epsilon carbon diffusion-perlite ferrite, interface justifying increased mechanical strength is identified.

Biography :

Email: mromanyuk@frsn.utn.edu.ar ebrandaleze@frsn.utn.edu.ar