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
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2021-01-26
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Multidisciplinary Digital Publishing Institute (MDPI)
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In the last decades, low-density steels for forging have increasing interest in the automotive
industry, and good mechanical properties are required for their real application. This paper
describes the results obtained for a 0.66C11.4Mn9.9Al duplex austenitic low-density steel after applying
a set of isothermal treatments at different combinations of time and temperature, aimed to
promote kappa carbide precipitation, and improve the mechanical properties obtained with a water
quenching treatment. The effects of the different isothermal treatments on the microstructure and
on the mechanical properties have been analyzed and compared to those obtained from a quenching
heat treatment. We found that isothermal treatments in the range temperature between 550–750 °C
promoted the profuse precipitation of coarse kappa carbides at grain boundaries, which dramatically
reduced the ductility of the alloy, whereas a traditional quenching treatment resulted in a better
combination of ductility and mechanical strength.
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Kaltzakorta, Idurre, Teresa Gutierrez, Roberto Elvira, Pello Jimbert, and Teresa Guraya. “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.” Metals 11, no. 2 (January 26, 2021): 214. doi:10.3390/met11020214.