Transformaciones de fases durante el tratamiento térmico de austemperizado en un acero 0.41%C - 0.7%Mn - 2.15%Si - 0.013%Al

Ana Karen García-Ramírez; Victor Manuel López-Hirata; Maribel Leticia Saucedo-Muñoz; Jorge De Jesus-García; Enrique Meza-García

doi:10.29057/icbi.v10iEspecial7.9873

Ana Karen García-Ramírez Instituto Politécnico Nacional https://orcid.org/0000-0003-2870-8767
Victor Manuel López-Hirata Instituto Politécnico Nacional https://orcid.org/0000-0002-7781-3419
Maribel Leticia Saucedo-Muñoz Instituto Politécnico Nacional https://orcid.org/0000-0001-8610-0579
Jorge De Jesus-García Instituto Politécnico Nacional https://orcid.org/0000-0003-4308-8500
Enrique Meza-García Instituto Politécnico Nacional https://orcid.org/0000-0001-8209-1329

DOI: https://doi.org/10.29057/icbi.v10iEspecial7.9873

Keywords: AHSS, Austempering, Phase Transformations, Heat Treatment, High Silicon

Abstract

This work analyzed the phase transformations that occur in the advanced high strength steel (AHSS) 0.41%C- 0.7%Mn- 2.15%Si - 0.013%Al, this material is widely applied to the automobile industry for manufacture vehicle’s body and chassis as a result their excellent mechanical properties such as impact energy absorption and toughness. The Thermo-Calc software enabled us to predict the formation of the following phases: ferrite and carbides from received steel and the presence from austenite, bainite and carbides after heat treatment. The Thermo-Calc calculated results; TTT diagram agrees with micrographs and XRD. The results from austempering heat treatment present a microstructure composed of fine bainite, retained austenite and carbides M₇C₃, improving their mechanical properties, mainly hardness and ultimate tensile strength, 61 HR30N and 1513 MPa, respectively, compared to the initial condition, 45 HR30N and 856 MPa.

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