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Manufacturing of High-Strength and High-Ductility Pearlitic Steel Wires Using Noncircular Drawing Sequence

비원형 신선을 이용한 고강도-고연성 펄라이트 강선의 제조

  • Baek, Hyun Moo (Dept. of Mechanical Engineering, KAIST) ;
  • Hwang, Sun Kwang (Ultimate Manufacturing Technology R&BD Group, KITECH) ;
  • Joo, Ho Seon (Dept. of Mechanical Engineering, KAIST) ;
  • Im, Yong-Taek (Dept. of Mechanical Engineering, KAIST) ;
  • Son, Il-Heon (Wire Rod Research Group, Technical Research Laboratories, POSCO) ;
  • Bae, Chul Min (Wire Rod Research Group, Technical Research Laboratories, POSCO)
  • 백현무 (KAIST 기계공학과) ;
  • 황선광 (KITECH 극한제조기술연구실용화그룹) ;
  • 주호선 (KAIST 기계공학과) ;
  • 임용택 (KAIST 기계공학과) ;
  • 손일헌 (POSCO 기술연구원 선재연구그룹) ;
  • 배철민 (POSCO 기술연구원 선재연구그룹)
  • Received : 2014.03.04
  • Accepted : 2014.04.25
  • Published : 2014.07.01

Abstract

In this study, a noncircular drawing (NCD) sequence for manufacturing high-strength and high-ductility pearlitic steel wires was investigated. Multipass NCD was conducted up to the 12th pass at room temperature with two processing routes (defined as the NCDA and NCDB), and compared with the wire drawing (WD). During the torsion test, delamination fracture in the drawn wire was observed in the 10th pass of the WD whereas it was not observed until the 12th pass of the NCDB. From X-ray diffraction, the circular texture component that increases the likelihood of delamination fracture of the drawn wire was rarely observed in the NCDB. Thus, the improved ability of the multipass NCDB to manufacture high-strength pearlitic steel wires with high torsional ductility compared to the WD (by reducing the likelihood of delamination fracture) was demonstrated.

Keywords

Noncircular Drawing Sequence;High-strength;High-ductility;Delamination Fracture;X-ray Diffraction;Texture Evolution

Acknowledgement

Supported by : POSCO

References

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