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        Effect of Aging Isothermal Time on the Microstructure and Room-Temperature Impact Toughness of Fe–24.8Mn–7.3Al–1.2C Austenitic Steel with k-Carbides Precipitation

        Yifan Feng,Renbo Song,Zhongzheng Pei,Renfeng Song,Guoyu Dou 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5

        The microstructure and impact toughness of the as-cast Fe–24.8Mn–7.3Al–1.2C austenitic steel after solution treatmentand subsequent aging treatment were investigated in the present work. Research on the κ-carbides precipitation behaviorwas carried out by transmission electron microscope. The results show that nano-sized coherent κ-carbides were obtained inthe as-solutionized steel after aging treatment, which produced precipitation hardening. After being aging treated at 550 °Cfor 1 h, the steel with regular hexagonal grain structure exhibited a good combination of yield strength (~ 574 MPa) androom-temperature impact toughness (~ 168 J). In the present steel, the typical cube-on-cube orientation relationship betweenaustenite and κ-carbides was observed. However, due to the long aging isothermal time and high C content, the coarseintergranular κ′-carbide was formed and grew along the austenite grain boundary, which caused this orientation relationshipto be destroyed and a dramatical increase of the coherency strain energy at grain boundary. Furthermore, serious embrittlementof grain boundaries caused that cleavage cracks trend to propagate along the grain boundaries. Accordingly, theroom-temperature impact toughness decreased sharply. After aging isothermal time prolonging to 13 h, the Charpy V-notchimpact toughness was only ~ 5 J and fracture mode turned to fully brittle fracture accompanied with fl at facets, shear cracksand well-developed secondary crack.

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