Precipitation Effect on Mechanical Properties and Phase Stability of High Manganese Steel
High manganese (Mn) steels are attractive for automotive applications due to their excellent tensile strength and superior elongation. However, the relatively low yield strength of Mn steels compared to other advanced high-strength steels is a critical problem limiting their use in structural parts. In order to increase the yield strength, the precipitation hardening effect of Mn steels was investigated by the addition of carbide-forming elements. Changes in the austenite phase stability were also evaluated in terms of stacking fault energy (SFE). As a result, fine V(C,N) precipitates were found to increase the yield strength effectively but to lower the SFE by the consumption of matrix carbons. For achieving precipitation hardening without sacrificing austenite stability, the soluble carbon content was discussed.
Cheoljun Bae (1), Rosa Kim (1), Un-Hae Lee (2) and Jongryoul Kim (1)
1. Department of Metallurgy and Material ScienceHanyang UniversityAnsan-siRepublic of Korea
2. Technical Research Laboratories Gwangyang Research Lab., POSCOGwangyang-siRepublic of Korea
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Metallurgical and Materials Transactions A, vol. 48, no. 9, 2017, pp. 4072-4079.