Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Study on Internal Void Closure in Slab ingot during Hot Plate Forging

열간 판재단조시 강괴 내부의 기공폐쇄에 관한 연구

  • 조종래 (한국해양대학교 기계공학과) ;
  • 김동권 (한국중공업(주) 기술연구소) ;
  • 김영득 (한국중공업(주) 기술연구소) ;
  • 이부윤 (한국중공업(주) 기술연구소)
  • Published : 1996.03.01
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Abstract

In order to investigate the effect of pre-cooling of ingot on void closure in hot plate forging the internal strain and stress distributions are examined quantitatively by using ABAQUS. Simula-tions are carried out on a large slab ingot having the same temperature and the temperature gradient induced by air-cooling. It is shown that pre-cooling produces little effect on the strain behavior but remarkable effect on the hydrostatic stress at the central zone of ingot. The main factors for crushing micro-voids are the effective strain and the time integral of hydrostatic stress in the region surrounding the voids. Based on regression analysis it was found that the distortion of void can be expressed as a polynomial function of the two factors.

Keywords

References

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