Analysis of Microsegregation in Fe-Cr-Ni Weld Metal

Fe-Cr-Ni강 용접금속부의 미세편석에 관한 해석

  • 박준민 (한양대학교 금속공학과) ;
  • 박종민 (한양대학교 금속공학과) ;
  • 안상곤 (포항제철 기술연구소 스테인리스 연구팀) ;
  • 이창희 (한양대학교 금속공학과) ;
  • 윤의박 (한양대학교 금속공학과)
  • Published : 1998.10.01

Abstract

During solidification or welding of alloys, the solute redistribution brings out microsegregation. The microsegregation causes the formation of non-equilibrium second phases, shrinkage and porosity degrading mechanical/chemical properties Therefore, it has been required to predict microsegregation quantitatively. To predict the degree of microsegregation, more exact and appropriate computer simulation technique has been actively used during last two decades. To predict the degree of microsegregation in weld metal, an advanced two dimensional model was suggested. In the new model, both primary and secondary arm regions were defined for the analysis region. The growth in the primary arm regina was assumed to be a planar for effective calculation. Especially, for the growth of a secondary arm, a simple and effective mathematical function was established to show the growing pattern, the solute diffusion in the solid phase was calculated by finite difference method (FDM). The solid-liquid interface movement was considered to be in local equilibrium state. The experiments for welding of 310S stainless steel were carried out in order to examined the reasonability and feasibility of this model. The concentration profiles of the solute predicted by this model were compared with those obtained from experimental works.

Keywords

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