Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Microstructure on Fracture Behavior of Multi-phase Low-density Steel

다상계 저비중강의 파괴거동에 미치는 미세조직의 영향

  • Shin, Sun-Kyoung (School of Materials Science and Engineering, Pusan National University) ;
  • Park, Seong-Jun (Ferrous alloy department, Korea Institute of Materials Science) ;
  • Cho, Kyung Mox (School of Materials Science and Engineering, Pusan National University)
  • 신선경 (부산대학교 재료공학부) ;
  • 박성준 (한국기계연구원 부설 재료연구소 철강재료연구실) ;
  • 조경목 (부산대학교 재료공학부)
  • Received : 2013.09.27
  • Accepted : 2013.10.10
  • Published : 2013.11.30
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Abstract

Microstructure and fracture behavior of a multi-phase low-density steel were investigated. After hot-rolling and heat treatment, the microstructure of low-density steel was composed of coarse ferrite grains and elongated bands which include second phases such as austenite, martensite and ${\kappa}$-carbide depending on holding time during isothermal heat treatment. After tensile test, microcracks were observed at martensite or ${\kappa}$-carbide interface in the elongated bands. Coarse ferrite grains showed cleavage fracture behavior regardless of second phase. The cleavage fracture of ferrite could be attributed to their coarse grain size and solute atoms that increase ductile-to-brittle transition temperature of ferrite. Despite of the tendency of cleavage fracture in coarse ferrite grains, a specimen having coarse spheroidized ${\kappa}$-carbide particles in the elongated bands showed high total elongation of 30%. Thus, the easiness of plastic deformation in the elongated band seems to play an important role in retardation of cleavage crack formation in coarse ferrite grains.

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