Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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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
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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.

본 연구에서는 고강도-고연성 펄라이트 강선을 제조하기 위하여 비원형 신선 공정을 적용하였다. 다단 비원형 신선 공정을 A와 B로 정의한 2 종류의 가공경로를 이용하여 상온에서 12 패스까지 수행하였다. 비원형 신선 공정과의 비교를 위해서 기존의 원형 신선 공정을 수행하고 기계적 특성과 집합조직 발달에 대해 비교를 수행하였다. 원형 신선 공정으로 제조된 강선은 10 패스에서부터 박리파괴가 관찰되었지만, 비원형 신선 가공경로 B의 경우는 12 패스에서도 박리파괴가 발생하지 않았으며, 이는 X-선회절로부터 측정된 집합조직 결과에서 원형집합조직의 발달이 적은 것과 연관된다. 따라서, 다단 비원형 신선 공정을 통하여 기존의 신선 공정보다 박리파괴의 발생 가능성을 저감시킴으로써 높은 비틀림 연성을 갖는 고강도 펄라이트 강선을 제조할 수 있음을 확인할 수 있었다.

Keywords

References

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