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Different Effects of Ni and Mn on Thermodynamic and Mechanical Stabilities in Cr-Ni-Mn Austenitic Steels

  • Han-Seop Noh
  • Jee-Hyun Kang
  • Kwang-Min Kim
  • Sung-Joon Kim
Article
  • 95 Downloads

Abstract

Thermodynamic and mechanical stabilities of austenite were investigated in Cr-Ni-Mn austenitic steels by varying the contents of Ni and Mn. Mn was more beneficial to increasing thermodynamic stability against martensitic transformation than the equivalent amount of Ni. However, the tendency for strain-induced martensite transformation was governed not by the thermodynamic stability but by stacking fault energy (SFE) which was increased more effectively by Ni than by the equivalent amount of Mn. A modified SFE equation and experimentally determined Ni equivalents may suggest a criterion for austenite stability throughout tensile deformation.

Notes

Acknowledgment

The authors thank POSCO (Pohang, Republic of Korea) and National Research Foundation of Korea (Grant No. 2017R1A2B4009780) for the financial support and the provision of the materials.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Han-Seop Noh
    • 1
  • Jee-Hyun Kang
    • 2
  • Kwang-Min Kim
    • 3
  • Sung-Joon Kim
    • 1
  1. 1.Graduate Institute of Ferrous TechnologyPOSTECHPohangRepublic of Korea
  2. 2.School of Materials Science and Engineering, Yeungnam UniversityGyeongsanRepublic of Korea
  3. 3.Technical Research LaboratoriesPOSCOPohangRepublic of Korea

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