Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
권호 표지

Prediction on Flow Stress Curves and Microstructure of 304 Stainless Steel

304 스테인리스강이 고온 유동응력곡선과 미세 조직의 예측

  • 한형기 (인하대학교 재료공학부) ;
  • 유연철 (인하대학교 재료공학부) ;
  • 김성일 (인하대학교 재료공학부)
  • Published : 2000.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

Dynamic recrystallization (DRX), which may occur during hot deformation, is important for the microsturctural evolution of 304 stainless steel. Especially, the current interest in modelling hot rolling demands quantitative relationships among the thermomechanical process variables, such as strain, temperature, strain rate, and etc. Thus, this paper individually presents the relationships for flow stress and volume fraction of DRX as a function of processing variables using torsion tests. The hot torsion tests of 304 stainless steel were performed at the temperature range of 900~110$0^{\circ}C$ and the strain rate range of 5x10-2~5s-1 to study the high temperature softening behavior. For the exact prediction of flow stress, the equation was divided into two regions, the work hardening (WH) and dynamic recovery (DRV) region and the DRX region. Especially, The flow stress of DRX region could be expressed by using the volume fraction of DRX (XDRX). Since XDRX was consisted of the critical strain($\varepsilon$c) for initiation of dynamic recrystallization (DRX) and the strain for maximum softening rate ($\varepsilon$*), that were related with the evolution of microstructure. The calculated results predicted the flow stress and the microstructure of the alloy at any deformation conditions well.

Keywords

References

  1. Mater. Sci. Technol. v.14 no.8 HotDeformation Behavior of SiCp/A12024 Composites Reinforced with Various Sizes of SiCp B. C. Ko;K. S. Park;Y. C. Yoo
  2. J. of Mater. Sci. Lett. v.16 Determination of No-Recrystallization Temperature of Inar Alloy by Fractional Softening Measurement during the Multistage Deformation S. H. Cho;S. I. Kim;Y. C. Yoo
  3. Comp. Sci. and Technol. v.58 Hot Deformation Behavior of AA2124 Composites Reinforced with Both Particles and Whiskers of SiC B. C. Ko;Y. C. Yoo
  4. The 3rd Pacific Rim Int.Conf.on Advanced Materials and Processing(PRICM-3) v.1 Metadynamic Recrystallization of AISI 304 Stainless Steel S. H. Cho;Y. S. Kim;Y. C. Yoo
  5. Mater. Sci.and Technol. v.6 Dislocation Substructures Developed during Dynamic Recrystallization in Polycrystalline Nickel T. Sakai;M. Ohashi
  6. Mater. Sci. Technol. v.6 Modelling Microstructrual Development during Hot Rolling C. M. Sellars
  7. Metall.and Mater.Trans. v.25 Softening and Microstructural Change Following the Dynamic Recrystallization of Austenite C. Roucoules;P. D. Hodgson;S. Yue;J. J. Jonas
  8. Metal.and Mater.Trans.A. v.28 Modeling the Flow Behavior of a Medium Carbon Microalloyed Steel Under Hot Working Conditions J. M. Cabrera;A. A. Omar;J. J. Jonas;J. M. Prado
  9. 대한금속학회지 v.36 no.4 A16061합금의 고온변형시 변형저항 예측 조상현;김유승;유연철;임성한;오수익
  10. Steel Research v.63 no.6 Model for Integrated Process and Microstructure Simulation Hot Forming K. Karhausen;R. Kopp
  11. ISIJ Inter v.32 no.3 Modeling Microstructure and Its Effects during Multipass Hot Rolling J. H. Beynon;C. M. Sellars
  12. Metall.and Mater.Trans.A v.26 Energy Dissipation Efficiency in Aluminum Dependent on Monotonic Flow Curves and Dynamic Recovery H. J. Mcqueen;E. Evangelista;N. Jin;M. E. Kassner
  13. Metals and Materials v.4 no.4 The Effect of Deformation Variables on Hot Workability of Austenite Stainless Steel S. H. Cho;S. I. Kim;Y. C. Yoo
  14. 대한금속학회지 v.35 no.6 304 오스테나이트계 스테인레스강의 고온연화 조상현;김성일;유연철;노광섭;이경종;권오준
  15. Proc.of the 7th RisØ Inter. Sympo. on Metall. and Mater. Sci. Dynamic Recrystallization in Austenitic Stainless Steel N. D. Ryan;H. J. Mcqueen;E. Evangelista
  16. J. Chem. Phys. v.7 M. Avrami
  17. Acta Mater. v.44 no.1 General Expression of the Zener-Hollomon Parameter as a Function of the Chemical Composition of Fow Alloy and Microalloyed Steels S. F. Medina;C. A. Hernandez
  18. Acta Mater. v.44 no.1 The Influence of Chimical Composition on the Peak Strain of Deformed Austenite in Low Alloy and Microalloyed Steels S. F. Medina;C. A. Hernandez
  19. Acta Mater. v.44 no.1 Modelling Austenite Flow Curves in Low Alloy and Microalloyed Steels S. F. Medina;C. A. Hernandez
  20. Acta Mater. v.44 no.1 Modelling of the Dynamic Recrystallization of Austenite in Low Alloy and Microalloyed Steels S. F. Medina;C. A. Hernandez