Numerical Modeling of the Transformation Temperature Effect on the Relaxation of Welding Residual Stress

용접 잔류응력 완화에 미치는 변태 온도의 영향에 관한 수치적 모델링

  • 장경복 (부산대학교 대학원 정밀기계공학과) ;
  • 강성수 (부산대학교 기계공학부)
  • Published : 2000.10.01


Most of ferrous b.c.c weld materials have martensitic transformation during rapid cooling after welding. It is well known that volume expansion due to the phase transformation could influence on the relaxation of welding residual stress. To apply this effect practically, it is necessary to establish a numerical model which is able to estimate the effect of phase transformation on residual stress relaxation quantitatively. For this purpose, the analysis is carried out in two regions, i.e., heating and cooling, because the variation of material properties following a phase transformation in cooling is different in comparison with the case in heating, even at the same temperature. The variation of material properties following phase transformation is considered by the adjustment of specific heat and thermal expansion coefficient, and the distribution of residual stress in analysis is compared with that of experiment by previous study. In this study, simplified numerical procedures considering phase transformation, which based on a commercial finite element package was established through comparing with the experimental data of residual stress distribution by other researcher. To consider the phase transformation effect on residual stress relaxation, the transition of mechanical and thermal property such as thermal expansion coefficient and specific heat capacity was found by try and error method in this analysis. In addition to, since the transformation temperature changes by the kind and control of alloying elements, the steel with many kinds of transformation temperature were selected and the effect of transformation on stress releasement was investigated by the numerical procedures considering phase transformation.


Martensite Transformation;Transformation Expansion;Welding Residual Stress;Residual Stress Relaxation;Specific Heat;Thermal Expansion Coefficient


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