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

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자료유형: 학술저널

저자정보: Yifan Feng (University of Science and Technology Beijing) Renbo Song (University of Science and Technology Beijing) Zhongzheng Pei (University of Science and Technology Beijing) Renfeng Song (Ansteel Mining Engineering Corporation) Guoyu Dou (Ansteel Mining Engineering Corporation)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.5

발행연도: 2018.1

수록면: 1,012 - 1,023 (12page)

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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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