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Metallurgical and Materials Transactions A

, Volume 48, Issue 9, pp 4072–4079 | Cite as

Precipitation Effect on Mechanical Properties and Phase Stability of High Manganese Steel

  • Cheoljun Bae
  • Rosa Kim
  • Un-Hae Lee
  • Jongryoul Kim
Article
  • 398 Downloads

Abstract

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.

Notes

Acknowledgments

This work was performed with the support from POSCO and the Human Resources Development program (No. 20154030200680) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry and Energy.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2017

Authors and Affiliations

  • Cheoljun Bae
    • 1
  • Rosa Kim
    • 1
  • Un-Hae Lee
    • 2
  • Jongryoul Kim
    • 1
  1. 1.Department of Metallurgy and Material ScienceHanyang UniversityAnsan-siRepublic of Korea
  2. 2.Technical Research Laboratories Gwangyang Research Lab., POSCOGwangyang-siRepublic of Korea

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