Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Effects of Heat Treatment Condition on the Mechanical Properties in Fe-0.4%C-2.3%Si Steel

Fe-0.4C-2.3Si강의 기계적 성질에 미치는 오스템퍼링 열처리 조건의 영향

  • Son, Je-Young (School of Materials Science and Engineering, Materials Science and Metallurgical Engineering, Graduate School of Kyungpook National University) ;
  • Song, June-Hwan (School of Materials Science and Engineering, Materials Science and Metallurgical Engineering, Graduate School of Kyungpook National University) ;
  • Kim, Ji-Hun (Small and Medium Business Corporation) ;
  • Ye, Byung-Joon (School of Materials Science and Engineering, Materials Science and Metallurgical Engineering, Graduate School of Kyungpook National University)
  • Received : 2012.03.30
  • Accepted : 2012.04.20
  • Published : 2012.04.30
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Abstract

The effect of heat treatment on mechanical properties of 0.4C-2.3Si(wt%) steel with bainitic ferrite matrix were investigated. This steel has been synthesized intergrating concepts from TRIP(Transformation Induced Plasticity) steel & Austempered Ductile Cast Iron(ADI) technology. The low alloy medium carbon (0.4 %C) steel with high silicon (2.3 %Si) was initially annealed for 60 min at $800^{\circ}C$, $820^{\circ}C$ and $840^{\circ}C$ respectively in the intercritical region and then subsequently austempered at various temperatures at $260^{\circ}C$, $320^{\circ}C$ and $380^{\circ}C$ for 30 min in a salt bath. The mechanical properties were measured by using a tensile test. A detailed study of the microstructure of this steel after heat treatment was carried out by means of electron back scattering diffraction (EBSD) technic. In this study, a new low alloy steel with high strength (780~1,050MPa) and exceptionally high ductility (20~40%) was obtained.

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References

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