Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Mechanical Property and Ductile-Brittle Transition Behavior of Ti-Nb-P Added Extra Low Carbon High Strength Steel Sheets

Ti-Nb-P 첨가 극저탄소 고강도 강판의 기계적 성질과 연성-취 천이거동

  • Park J. J. (School of Advanced Materials Eng. & RCAMD, Chonbuk Nat. Univ.) ;
  • Lee O. Y. (School of Advanced Materials Eng. & RCAMD, Chonbuk Nat. Univ.) ;
  • Park Y. K. (School of Advanced Materials Eng. & RCAMD, Chonbuk Nat. Univ.) ;
  • Han S. H. (Automotive Steels Research Center, POSCO Technical Research Lab.) ;
  • Chin K. G. (Automotive Steels Research Center, POSCO Technical Research Lab.)
  • 박종재 (전북대학교 신소재공학부, 신소재개발연구센터) ;
  • 이오연 (전북대학교 신소재공학부, 신소재개발연구센터) ;
  • 박영구 (전북대학교 신소재공학부, 신소재개발연구센터) ;
  • 한상호 (POSCO 기술연구소 자동차강재연구센터) ;
  • 진광근 (POSCO 기술연구소 자동차강재연구센터)
  • Published : 2004.12.01
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Abstract

The purpose of this research is to investigate the mechanical property and ductile-brittle transition temperature of Ti-Nb-P added extra low carbon interstitial free steel having a tensile strength of 440 MPa. The mechanical property and transition temperature of hot rolled steel sheets were more influenced by the coiling temperature rather than by the small amount of alloying element. Further, at the same composition, the property of the specimen coiled at low temperature was superior to that obtained at higher coiling temperature. The fracture surface of 0.005C-0.2Si-1.43Mn steel coiled at $630^{\circ}C$ showed a ductile fracture mode at $-100^{\circ}C$, but coiling at $670^{\circ}C$ showed a transgranular brittle fracture mode at $-90^{\circ}C$. The galvannealed 0.006C-0.07Si-1.33Mn steel sheet annealed at $810^{\circ}C$ has tensile strength and elongation of 442.8 MPa and $36.6\%$, respectively. The transition temperature of galvannealed 0.006C-0.07Si-1.33Mn steel sheet was increased with a drawing ratio, and the transition temperature of the galvannealed 0.006C-0.07Si-1.33Mn steel was $-60^{\circ}C$ at a drawing ratio of 1.8

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