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- 저자 : 주호선(Ho Seon Joo) (검색결과 3 건)
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주호선(Ho Seon Joo),황선광(Sun Kwang Hwang),백현무(Hyun Moo Baek),임용택(Yong-Taek Im),손일헌(Il-Heon Son),배철민(Chul Min Bae) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In the present study, a non-circular drawing (NCD) sequence was investigated for manufacturing medium carbon steel wires in which spheroidization of cementite was improved. The NCD was applied up to four passes and compared with the wire drawing (WD) process. According to the present investigation, the wires, subject to subcritical annealing following the NCD, showed the reduced ultimate tensile strength and the enhanced reduction of area compared to those for the WD process. Scanning electron microscopy was employed to investigate the underlying mechanism for such phenomena by observing the microstructure changes during the spheroidization annealing. It was found that the spheroidization of cementite was more likely to be accelerated by the NCD.
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비원형 신선을 이용한 고강도-고연성 펄라이트 강선의 제조
백현무(Hyun Moo Baek),황선광(Sun Kwang Hwang),주호선(Ho Seon Joo),임용택(Yong-Taek Im),손일헌(Il-Heon Son),배철민(Chul Min Bae) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In this study, a non-circular drawing (NCD) sequence was investigated for manufacturing high-strength and highductility pearlitic steel wires considering the effect of processing routes on occurrence of delamination fracture during the torsion test. For this purpose, the multi-pass NCD was conducted up to the 12th pass at room temperature with two kinds of processing routes, defined as the NCDA and NCDB. It was compared with the conventional wire drawing (WD). In the torsion test, delamination fracture was observed in the drawn wire by the WD for the 10th pass while it was not observed in the 12th pass NCDB. According to the X-ray diffraction measurement, a circular texture component, which increases likeliness of delamination fracture, was rarely observed in the drawn wire by the NCDB. From these results, it was demonstrated that the multi-pass NCDB could manufacture high-strength pearlitic steel wires with high-torsional ductility compared to the WD by reducing likeliness of delamination fracture.
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비원형 신선을 이용한 고강도-고연성 펄라이트 강선의 제조
백현무(Hyun Moo Baek),황선광(Sun Kwang Hwang),주호선(Ho Seon Joo),임용택(Yong-Taek Im),손일헌(Il-Heon Son),배철민(Chul Min Bae) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.7
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 집합조직발달에 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. 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.
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