Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Intercritical Annealing on Microstructure and Mechanical Properties of Fe-9Mn-0.2C-3Al-0.5Si Medium Manganese Steels Containing Cu and Ni

구리와 니켈이 포함된 Fe-9Mn-0.2C-3Al-0.5Si 중망간강의 미세조직과 기계적 특성에 미치는 2상역 어닐링의 영향

  • Lee, Seung-Wan (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Sin, Seung-Hyuk (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)
  • 이승완 (서울과학기술대학교 신소재공학과) ;
  • 신승혁 (서울과학기술대학교 신소재공학과) ;
  • 황병철 (서울과학기술대학교 신소재공학과)
  • Received : 2019.11.25
  • Accepted : 2019.12.24
  • Published : 2020.01.27
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Abstract

The effect of intercritical annealing temperature on the microstructure and mechanical properties of Fe-9Mn-0.2C-3Al-0.5Si medium manganese steels containing Cu and Ni is investigated in this study. Six kinds of medium manganese steels are fabricated by varying the chemical composition and intercritical annealing temperature. Hardness and tensile tests are performed to examine the correlation of microstructure and mechanical properties for the intercritical annealed medium manganese steels containing Cu and Ni. The microstructures of all the steels are composed mostly of lath ferrite, reverted austenite and cementite, regardless of annealing temperature. The room-temperature tensile test results show that the yield and tensile strengths decrease with increasing intercritical annealing temperature due to higher volume fraction and larger thickness of reverted austenite. On the other hand, total and uniform elongations, and strain hardening exponent increase due to higher dislocation density because transformation-induced plasticity is promoted with increasing annealing temperature by reduction in reverted austenite stability.

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References

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