Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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δ-Ferrite Behavior of Butt Weld Zone in Clad Steel Plates Depended on Holding Time of PWHT

클래드강 맞대기 용접부의 후열처리 유지시간에 따른 델타 페라이트 거동

  • Park, Jae-Won (School of Nano IT Fusion Program, Graduate School of NID Fusion Technology, Seoul National University of Science and Technology) ;
  • Lee, Chul-Ku (Dept. of Mechanical and Automotive Engineering, Seoul National University of Science and Technology)
  • 박재원 (NID 융합기술대학원 나노.IT 융합프로그램) ;
  • 이철구 (서울과학기술대학교 기계.자동차공학과)
  • Received : 2007.11.16
  • Accepted : 2008.03.24
  • Published : 2014.04.30
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Abstract

Recently, in order to enhance the function and usefulness of products, cladding of dissimilar materials that maximizes the performance of the material is being widely used in all areas of industry as an important process. Clad steel plate, produced by cladding stainless steel plate, an anticorrosive material, on carbon steel plate, is being used to produce pressure vessels. Stainless steel plate has good corrosion resistance, and carbon steel plate has good rigidity and strength; clad steel can satisfy all of these qualities at once. This study aims to find the ${\delta}$-ferrite behavior, mechanical properties, structure change, integrity and reliability of clad steel weld on hot rolled steel plates. For this purpose, multi-layer welding, repair welding and post weld heat treatment were implemented according to welding procedure specifications (WPS). In order to observe the mechanical properties and toughness of clad steel weld zone, post weld heat treatment was carried out according to ASME Sec. VIII Div.1 UW-40 procedure for post weld heat treatment. With heat treatment at $625^{\circ}C$, the hold time was used as the process variable, increased by intervals that were doubled each time, from 80 to 1,280 min. The structure of weld part was typical cast structure; localized primary austenite areas appeared near central vermicular ferrite and fusion line. The heat affected zone showed rough austenite structure created by the weld heat input. Due to annealing effects of heat treatment, the mechanical properties (tensile strength, hardness, impact value) of the heat affected area tended to decrease. From the results of this study, it is possible to conclude the integrity of clad steel welds is not affected much in field welding, repair welding, multi-layer welding, post weld heat treatment, etc.

Keywords

References

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