Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Grain Size on the Tensile Properties of an Austenitic High-Manganese Steel

오스테나이트계 고망간강의 인장 특성에 미치는 결정립 크기의 영향

  • Lee, Sang-In (Department of Materials Science and Engineering Seoul National University of Science and Technology) ;
  • Cho, Yun (Department of Materials Science and Engineering Seoul National University of Science and Technology) ;
  • Hwang, Byoungchul (Department of Materials Science and Engineering Seoul National University of Science and Technology)
  • 이상인 (서울과학기술대학교 신소재공학과) ;
  • 조윤 (서울과학기술대학교 신소재공학과) ;
  • 황병철 (서울과학기술대학교 신소재공학과)
  • Received : 2016.04.12
  • Accepted : 2016.05.12
  • Published : 2016.06.27
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Abstract

This paper presents a study of the tensile properties of austenitic high-manganese steel specimens with different grain sizes. Although the stacking fault energy, calculated using a modified thermodynamic model, slightly decreased with increasing grain size, it was found to vary in a range of $23.4mJ/m^2$ to $27.1mJ/m^2$. Room-temperature tensile test results indicated that the yield and tensile strengths increased; the ductility also improved as the grain size decreased. The increase in the yield and tensile strengths was primarily attributed to the occurrence of mechanical twinning, as well as to the grain refinement effect. On the other hand, the improvement of the ductility is because the formation of deformation-induced martensite is suppressed in the high-manganese steel specimen with small grain size during tensile testing. The deformation-induced martensite transformation resulting from the increased grain size can be explained by the decrease in stacking fault energy or in shear stress required to generate deformation-induced martensite transformation.

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References

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