Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Determination of Material Parameters for Microstructure Prediction Model of Alloy 718 Based on Recystallization and Grain Growth Theories

재결정 및 결정립 성장이론에 기초한 Alloy 718의 조직예측 모델에 대한 재료상수 결정방법

  • 염종택 (재료연구소(KIMS), 특수합금연구그룹) ;
  • 홍재근 (재료연구소(KIMS), 특수합금연구그룹) ;
  • 김정한 (재료연구소(KIMS), 특수합금연구그룹) ;
  • 박노광 (재료연구소(KIMS), 특수합금연구그룹)
  • Received : 2011.08.18
  • Accepted : 2011.10.10
  • Published : 2011.11.01
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Abstract

This work describes a method for determining material parameters included in recrystallization and grain growth models of metallic materials. The focus is on the recrystallization and grain growth models of Ni-Fe based superalloy, Alloy 718. High temperature compression test data at different strain, strain rate and temperature conditions were chosen to determine the material parameters of the model. The critical strain and dynamically recrystallized grain size and fraction at various process conditions were generated from the microstructural analysis and strain-stress relationships of the compression tests. Also, isothermal heat treatments were utilized to fit the material constants included in the grain growth model. Verification of the determined material parameters is carried out by comparing the average grain size data obtained from other compression tests of the Alloy 718 specimens with the initial grain size of $59.5{\mu}m$.

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References

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