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김용관(Y. G. Kim),윤용석(Y. S. Yoon),이경훈(K. H. Lee) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
Internal void are usually present in ingot, bloom, slab produced by casting. These voids must be closed in the subsequent process such as forging(upsetting, cogging) or rolling to ensure high quality of the product. In this work, Multi-scale method has been applied to predict the defect behavior in metal forming process. Void Model which constructed for a ingot containing a void and RVE Model which is representative volume element of a void are simulated by finite element analysis. Deformation behavior of void in two models was compared.
김용관(Y. G Kim),김용환(Y. H. Kim) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Finite element simulations were carried out to investigate the influence of grain growth in the superplastic blow forming process. A microstructure-based constitutive model included grain growth effect is proposed and used in this simulation. Also, grain growth rate equation considering both static and dynamic grain growth is used. The forming pressure-time curve and the thickness distribution of results of simulation well explain that grain growth significantly leads to deformation hardening in superplastic forming. In addition, grain evolution was quantitatively indicated on superplastic formed part. This study shows that microstructural features such as grain growth is an important factor to predict material behavior during superplastic deformation.