Abstract
The effects of the second-phase characteristics on the deformation and fracture behavior in low-density steel are investigated in Fe-0.2C-(4, 8)Mn-5Al-1Si alloys, where the second phase can be retained austenite or a mixture of κ-carbide and ferrite depending on the processing condition. With austenite as second phase, the mechanical stability of the austenite is critical regarding ductility because the fracture is likely to occur before the onset of necking when the austenite transforms into martensite in the early stage of deformation. In the case of the mixture of ferrite and κ-carbide, the round shape of κ-carbide is more favorable than the dense lamellar structure. The prominent influence of the second phase on the deformation and fracture behavior is attributable to the propensity of matrix ferrite for cleavage fracture due to its large aluminum concentration.
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Acknowledgement
This work was supported by the Materials and Components Technology Development Program (10048157) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea). Mr. Lee and Prof. Han were supported by the Basic Science Research Program through the National Research Foundation in Korea funded by the Ministry of Science, ICT, and Future Planning (NRF-2013R1A2A2A01008806).
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Park, SJ., Heo, YU., Choi, Y.H. et al. Effect of Second Phase on the Deformation and Fracture Behavior of Multiphase Low-Density Steels. JOM 66, 1837–1844 (2014). https://doi.org/10.1007/s11837-014-1060-6
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DOI: https://doi.org/10.1007/s11837-014-1060-6