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베어링강의 고온변형 특성에 관한 연구
A Study on Hot Deformation Behavior of Bearing Steels

문호근   (FAG한화베어링㈜연구소CC0145862  ); 이재성   (FAG한화베어링㈜연구소CC0145862  ); 유선준   (포스코㈜기술연구소 후판연구팀  ); 전만수   (경상대학교 기계항공공학부UU0000114  );
  • 초록

    In this paper, the stress-strain curves of bearing steels at hot working conditions are obtained by hot compression test with a computer controlled servo-hydraulic Gleeble 3800 testing machine and elongations and reductions of area of the bearing steels are also obtained by hot tensile test with a Gleeble 1500 testing machine. Experiments are conducted under the various strain-rates and temperatures and their results are used to obtain the flow stress information. A rigid thermo-viscoplastic finite element method is applied to the multi-stage hot forging process in order to predict temperature distribution of workpiece. The experimental results and the analysis results are used to obtain an optimal hot forging condition.


  • 주제어

    열간단조공정 .   베어링강 .   응력-변형율 곡선 .   고온압축시험 .   고온인장시험 .   강열점소성 유한요소법.  

  • 참고문헌 (21)

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    3. Joun, M. S., Moon, H. K., Shivpuri, R., 1998, 'Automatic Simulation of a Sequence of Hot-Former Forging Processes by a Rigid-Thermoviscoplastic Finite Element Method,' Trans. ASME, Journal of Engineering Materials and Technology, Vol. 120, pp. 291-296 
    4. Rebelo, N., and Kobayashi, S., 1980 'A Coupled Analysis of Viscoplastic Deformation and Heat Transfer-II. Applications,' Int. J. Mech. Sci., Vol. 22, pp. 707-718 
    5. Kobayashi, S., Oh, S. I. and Altan, T., 1989, Metal Forming and the finite Element Method, Oxford University Press 
    6. Bang, W., Lee, C. S., Chang, Y. W., 2001, 'Analysis of Hot Forming Process with Flow Softening by Dynamic Recrystallization,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 10, No.2, pp. 137-143     
    7. Bang, W., Jung, J. Y., Chang, Y. W., 2001, 'The Effect of Deformation Heat Compensation in the Hot Forging Analysis of SAF 2507 Stainless Steel,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 10, No.3, pp. 206-213     
    8. Jeong, H. S., Cho, J. R., Chao, D. J., Bae, Y. B., 2001, 'A Study on Dynamic and Static Recrystallization Behaviors and Microstructure Evolution Prediction of a Die Steel,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 10, No.4, pp. 338-346     
    9. Choi, M. S., Kang, B. S., Yum, J. T., Park, N. K., 1998, 'Prediction of the Behavior of Dynamic Recrystallization in Inconel 718 during Hot Forging using Finite Element Method,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 7, No.3, pp. 197-206     
    10. Han, H. K., Kim, S. I., Yoo, Y. C., 2000, 'Prediction on Flow Stress Curves and Microstructure of 304 Stainless Steel,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 9, No. I, pp. 72-79     
    11. Han, H. K .. Kim, S. I., lung, T. S., Yoo, Y. C., 2000, 'Effects of Process Variables on Static and Metadynamic Softening of SCM 440,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 9, No. 1, pp. 80-87     
    12. Han, H. K., Yoo, Y. C., 2001, 'The Evolution of Dynamically Recrystallized Microstructure for SCM 440,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 10, No. I, pp. 35-41     
    13. Ko, B. C., Kim, J. H., Yoo, Y. C., 1998, 'High Temperature Deformation Behavior of Al 5083 Alloy Using Deformation Processing Maps,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 7, No.5, pp. 450-458     
    14. Lee, K. S., Huh, H., 1997, 'Characterization of superplastic material SPF 8090 Al-Li with the variation of the strain rate and the temperature,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 6, No.5, pp. 425-434     
    15. Xia, X., Sakaris, P. and McQueen, H. J., 1994, 'Hot Deformation, Dynamic Recovery and Recrystallization Behavior of Aluminum 6061-SiCp Composites,' Mater. Sci. and Technol., Vol. 10, pp, 487-496 
    16. Ko, B. C., Kim, J. H., Yoo, Y. C., 1998, 'The Effects of Temperature and Strain Rate on Flow Stress and Strain of AA5083 Alloy during High Temperature Deformation,' Official Journal of KSTP, Transactions of Materials Processing, Vol. 7, No.2, pp. 168-176     
    17. Rao, K. P., Prasad, Y. K. D. V., Hawbolt, E. B., 1996, 'Hot Deformation Studies on a Low-Carbon Steel : Part I - Flow Curves and the Constitutive Relationship,' Journal of Materials Processing Technology, Vol. 56, pp. 897-907 
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