Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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A Study on Temperature Measurement for Quenching of Carbon Steel

탄소강 담금질 공정의 온도 측정방법에 대한 고찰

  • 김동규 (한국과학기술원 기계공학과 대학원) ;
  • 정경환 (한국과학기술원 기계공학과 대학원) ;
  • 강성훈 (한국기계연구원 부설 재료연구소) ;
  • 임용택 (한국과학기술원 기계공학과)
  • Published : 2010.02.01
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Abstract

To achieve desired microstructure and mechanical property of a manufacturing product, heat treatment process is applied as a secondary process after forging. Especially, quenching process is used for improving strength, hardness, and wear resistance since phase transformation occurs owing to rapid heat transfer from the surface of the specimen. In the present paper, a study on surface temperature measurement for water quenching of eutectoid steel was investigated. In order to determine the temperature history in experiments, three different measuring schemes were used by varying installation techniques of K-type thermocouples. Depending on the measured temperature distribution at the surface of the specimen, convective heat transfer coefficients were numerically determined as a function of temperature by the inverse finite element analysis considering the latent heat generation due to phase transformation. Based on the inversely determined convective heat transfer coefficient, temperature, phase, and hardness distributions in the specimen after water quenching were numerically predicted. By comparing the experimental and computational hardness distribution at three different locations in the specimen, the best temperature measuring scheme was determined. This work clearly demonstrates the effect of temperature measurement on the final mechanical property in terms of hardness distribution.

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References

  1. S. H. Kang, Y. T. Im, 2005, Three-dimensional finite-element analysis of the quenching process of plain-carbon steel with phase transformation, Metall. Mater. Trans. A, Vol. 36, pp. 2315-2325. https://doi.org/10.1007/s11661-005-0104-5
  2. S. H. Kang, Y. T. Im, 2007, Finite element investigation of multi-phase transformation within carburized carbon steel, J. Mater. Process. Technol., Vol. 183, pp. 241-248. https://doi.org/10.1016/j.jmatprotec.2006.10.018
  3. S. H. Kang, Y. T. Im, 2007, Three-dimensional thermo-elastic-plastic finite element modeling of quenching process of plain-carbon steel in couple with phase transformation, Int. J. Mech. Sci., Vol. 49, pp. 423-439. https://doi.org/10.1016/j.ijmecsci.2006.09.014
  4. P. R. Woodard, S. Chandrasekar, H. T. Y. Yang, 1999, Analysis of temperature and microstructure in the quenching of steel cylinders, Metall. Mater. Trans. B, Vol. 30, pp. 815-822. https://doi.org/10.1007/s11663-999-0043-4
  5. W. A. Johnson, R. F. Mehl, 1939, Reaction kinetics in processes of nucleation and growth, Trans. AIME, Vol. 135, pp. 416-458.
  6. M. Avrami, 1939, Kinetics of phase change I, J. Chem. Phys., Vol. 7, pp. 1103-1112. https://doi.org/10.1063/1.1750380
  7. E. Scheil, 1935, Anlaufzeit der austenitumwandlung, Arch. Eisenhuttenwes., Vol. 12, pp. 564-567.
  8. D. P. Koistinen, R. E. Marburger, 1959, A general equation prescribing the extent of the austenitemartensite transformation in pure iron-carbon alloys and carbon steels, Acta. Metall., Vol. 7, pp. 59-60. https://doi.org/10.1016/0001-6160(59)90170-1
  9. L. S. Darken, R.W. Gury, 1953, Physical Chemistry of Metals, McGraw-Hill, New York, NY, p. 415.
  10. T. Ericsson, S. Sjostrom, M. Knuuttila, 1983, Predicting Residual Stresses in Cases, D.E. Diesburg, ed., Case Hardened Steels, Metallurgical society of AIME, Warrendale, PA.
  11. E. C. Bain, 1963, Isothermal transformation diagrams, Third ed., United States Steel Corporation, Pittsburgh, PA, USA.
  12. C. A. Siebert, 1977, The hardenability of steels, ASM, Metals Park, OH.
  13. R. D. Manning, H. M. Reichhold, J. M. Hodge, 1967, Transformation and hardenability in steels, Symp. Proc., Climax Molybdenum Company, Ann Arbor, MI.
  14. A. Sugianto, M. Narazaki, M. Kogawara, A. Shirayori, S. Y. Kim, S. Kubota, 2009, Numerical simulation and experimental verification of carburizingquenching process of SCr420H steel helical gear, J. Mater. Process. Technol., Vol. 209, pp. 3597-3609. https://doi.org/10.1016/j.jmatprotec.2008.08.017