Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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Development of Thermal Distortion Analysis Method Based on Inherent Strain for TMCP Steels

TMCP 강판의 고유변형도 기반 열변형 해석법 개발

  • Ha, Yun-Sok (Samsung Heavy Industries CO., LTD., Welding Research Part) ;
  • Yang, Jin-Hyuk (Samsung Heavy Industries CO., LTD., Welding Research Part) ;
  • Won, Seok-Hee (Samsung Heavy Industries CO., LTD., Welding Research Part) ;
  • Yi, Myung-Su (Samsung Heavy Industries CO., LTD., Welding Research Part)
  • 하윤석 (삼성중공업 산업기술연구소 용접연구) ;
  • 양진혁 (삼성중공업 산업기술연구소 용접연구) ;
  • 원석희 (삼성중공업 산업기술연구소 용접연구) ;
  • 이명수 (삼성중공업 산업기술연구소 용접연구)
  • Published : 2008.06.30
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Abstract

As ships become to be larger than ever, the thicker plate and the higher tensile steel plate are used in naval shipyard. Though special chemical composition is needed for high-tensile steels, recent high-tensile steels are made by the TMCP(Thermo-Mechanical control process) skill. The increase of yield stress and tensile stress of TMCP steels is induced from bainite phase which is transformed from austenite, but that increased yield stress can be vanished by another additional thermal cycle like welding and heating. As thermal deformations are deeply related by yield stress of material, the study for prediction of plate deformation by heating should reflect principle of TMCP steels. This study developed an algorithm which can calculate inherent strain. In this algorithm, not only the mechanical principles of thermal deformations, but also the predicting of the portion of initial bainite is considered when calculating inherent strain. The simulations of plate deformation by these values showed good agreements with experimental results of normalizing steels and TMCP steels in welding and heating. Finally we made an inherent strain database of steels used in Class rule.

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References

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