Aplicación de Thermo-Calc en las transformaciones de fase de un acero 2.25Cr-1Mo durante su tratamiento térmico y exposición isotérmica

Víctor Manuel López-Hirata; Maribel Leticia Saucedo-Muñoz; Darío Alberto  Sígala-García; Erika Abigail  Morales-Hernández; José David Villegas-Cárdenas

doi:10.29057/icbi.v10iEspecial7.9918

Víctor Manuel López-Hirata Instituto Politécnico Nacional - ESIQIE https://orcid.org/0000-0002-7781-3419
Maribel Leticia Saucedo-Muñoz Instituto Politecnico Nacional - ESIQIE https://orcid.org/0000-0001-8610-0579
Darío Alberto Sígala-García Instituto Politecnico Nacional - ESIQIE https://orcid.org/0000-0002-3794-3024
Erika Abigail Morales-Hernández Instituto Politecnico Nacional - ESIQIE https://orcid.org/0000-0002-6437-4672
José David Villegas-Cárdenas Instituto Politecnico Nacional - ESIQIE https://orcid.org/0000-0002-5318-4849

DOI: https://doi.org/10.29057/icbi.v10iEspecial7.9918

Keywords: 2.25Cr-1Mo steel,, Phase transformations, Heat treatment, Thermal exposition, Mechanical properties

Abstract

This work analyzed the phase transformations that occur in the 2.25Cr-1Mosteel during their heat treatment and operation at 550 °C. This steel is widely applied to the manufacture of industrial components for petrochemical and power plants. The Thermo-Cal software enabled us to predict the formation of the following phases: ferrite and M₂₃C₆ y M₆C carbides, and the following microconstituents: ferrite and bainite during the normalizing and tempering treatments. The Thermo-Calc calculated results. TTT diagram agrees well with the experimental results of the as-received steel. On the other hand, the TC-Prisma module was used to follow the growth kinetics of M₆C and M₂₃C₆ carbides at 550 °C for times up to 1000 h. The calculated resulted permitted to establish the precipitation sequence and coarsening kinetics, which agree with the experimental results. Likewise, the effect of microstructure changes on the mechanical properties is also presented

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