Controllable κ-carbide precipitation enables strength-ductility co-enhancement in Fe-Mn-Al-C low-density austenitic steel via grain boundary engineering

doi:10.1016/j.jmst.2024.10.057

Abstract

Abstract: The influence of grain boundary engineering (GBE) on the precipitation behavior of κ-carbides and consequently mechanical properties of low-density Fe-30.5Mn-8Al-1C (wt.%) austenitic steel was experimentally investigated. The GBE treatments effectively introduce a large number of special boundaries (SBs). The intergranular κ-carbide precipitation was obviously inhibited during the subsequent aging treatment while maintaining more intragranular κ-carbides. The suppression of intergranular precipitation enhances the solid solution strengthening and precipitation strengthening effects, and the increased fraction of SBs improves the uniformity of plastic deformation. Consequently, GBE treatment can availably optimize the κ-carbide precipitation in Fe-Mn-Al-C alloys, thus facilitating a synchronous enhancement in strength and ductility.

Key words: Grain boundary engineering, Austenitic steels, Carbides, Precipitation, Mechanical properties

J.H. Du, P. Chen, F. Zhang, Z.P. Jia, F. Shi, X.W. Li. Controllable κ-carbide precipitation enables strength-ductility co-enhancement in Fe-Mn-Al-C low-density austenitic steel via grain boundary engineering[J]. J. Mater. Sci. Technol., 2025, 227: 26-31.

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