ESTUDIO MICROESTRUCTURAL DE UN ACERO FUNDIDO ALTO CARBONO-ALTO SILICIO SOMETIDO A TRATAMIENTOS TÉRMICOS DE AUSTEMPERADO Y Q&P

catheryne tobon; Ricardo Aristizábal Sierra; Oscar eduardo Ríos Diez

doi:10.17533/RCM/udea.rcm.n19a03

Authors

catheryne tobon Student
Ricardo Aristizábal Sierra Associate Professor, Department of Metallurgical and Materials Engineering, Universidad de Antioquia
Oscar eduardo Ríos Diez PhD in Materials Engineering, University of Antioquia

DOI:

https://doi.org/10.17533/RCM/udea.rcm.n19a03

Keywords:

Austempering, Quenching and Partitioning, Retained Austenite, Segregation, Cast Steel

Abstract

Usually, structures obtained by austempering and/or quenching methods application, and carbon partitioning (Q&P) as well, are complex heat treatments, resulting from different mechanisms: carbon precipitation, segregation and carbon partitioning in the austenite, among others. Besides being complex structures, they are directly blinded to the steel chemical composition and to the processing conditions too. Because of that, this work analyses the effect generated by the starting microstructure in a high carbon -high silicon steel on the microstructural development when low temperature thermal cycles are applied.On this purpose, steel through austempering and Q&P cycles was evaluated, starting from microstructures what was resulting from the casting cycle (as-cast), deformed (hot-formed) and homogenized. Results shows how the inhomogeneity in the chemical composition of the steel affects the transformations in the solid state that were a result from the thermal processes of austempering and Q&P, in turns, it prevents a homogeneous development of the transformation phases that resulted, since these transformations are strongly dependable of the chemical composition and characteristics of the high temperature austenite: grain size and chemical stability.

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