%0 Journal Article
%A Kaltzakorta, Idurre
%A Gutierrez, Teresa
%A Elvira, Roberto
%A Jimbert, Pello
%A Guraya, Teresa
%T Evolution of Microstructure during Isothermal Treatments of a Duplex-Austenitic 0.66C11.4Mn.9.9Al Low-Density Forging Steel and Effect on the Mechanical Properties
%D 2021
%U http://hdl.handle.net/11556/1064
%X In the last decades, low-density steels for forging have increasing interest in the automotiveindustry, and good mechanical properties are required for their real application. This paperdescribes the results obtained for a 0.66C11.4Mn9.9Al duplex austenitic low-density steel after applyinga set of isothermal treatments at different combinations of time and temperature, aimed topromote kappa carbide precipitation, and improve the mechanical properties obtained with a waterquenching treatment. The effects of the different isothermal treatments on the microstructure andon the mechanical properties have been analyzed and compared to those obtained from a quenchingheat treatment. We found that isothermal treatments in the range temperature between 550–750 °Cpromoted the profuse precipitation of coarse kappa carbides at grain boundaries, which dramaticallyreduced the ductility of the alloy, whereas a traditional quenching treatment resulted in a bettercombination of ductility and mechanical strength.
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