Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Failure Behavior of Piercing Plug during Seamless Tube Manufacturing Process

심리스 튜브 제조공정 시 피어싱 플러그의 파손거동

  • Lim, Young-Bin (Graduate School of Metallurgical Engineering, Division of Advanced Materials Engineering, Chonbuk National University) ;
  • Yoon, Jeong-Mo (Graduate School of Metallurgical Engineering, Division of Advanced Materials Engineering, Chonbuk National University)
  • 임영빈 (전북대학교 신소재공학부 금속공학과 대학원) ;
  • 윤정모 (전북대학교 신소재공학부 금속공학과 대학원)
  • Received : 2017.08.10
  • Accepted : 2017.08.29
  • Published : 2017.09.30
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Abstract

In this study, failure behavior of piercing plug for seamless tube manufacturing process was studied. Three different kinds of passed piercing plugs (10, 90, 215 times) were prepared. The shape deformation of the passed piercing plugs was observed by 3D coordinate measuring machine, and the oxidized layer on the surface of piercing plug was observed by optical microscopy. The length reduction of piercing plug presented at 215 times passed plug. It was found that the oxidized layer consisted of outer scale, inner scale and internal oxidation layers, and the inner scale layer had vertical cracks, and interfaces had horizontal cracks. We proposed the failure mechanism of piercing plug during seamless tube manufacturing process based on the formation of vertical and horizontal crack.

Keywords

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