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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (32권2호 104-108)

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

Je-Young Son, June-Hwan Song, Ji-Hun Kim*, Byung-Joon Ye

Kyungpook National University, *Small and Medium Business Corporation


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 800oC, 820oC and 840oC respectively in the intercritical region and then subsequently austempered at various temperatures at 260oC, 320oC and 380oC 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.


Intercritical annealing, Austempering, Retained austenite, Mechanical property.