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Thermal Analysis of Nickel-Base Superalloys by Differential Scanning Calorimetry

시차주사열량측정법에 의한 니켈기 초내열 합금의 열분석

Yun, Jihyeon;Oh, Junhyeob;Kim, Hongkyu;Yun, Jondo
윤지현;오준협;김홍규;윤존도

  • Received : 2015.08.24
  • Accepted : 2016.03.22
  • Published : 2016.05.27

Abstract

Appropriate thermo-mechanical properties of nickel-based superalloys are achieved by heat treatment, which induces precipitation and solid solution hardening; thus, information on the temperature ranges of precipitation and dissolution of the precipitates is essential for the determination of the heat treatment condition. In this study, thermal analyses of nickel-based superalloys were performed by differential scanning calorimetry method under conditions of various heating rates of 5, 10, 20, or 40K/min in a temperature range of 298~1573K. Precipitation and dissolution temperatures were determined by measuring peak temperatures, constructing trend lines, and extrapolating those lines to the zero heating rate to find the exact temperature under isothermal condition. Determined temperatures for the precipitation reactions were 813, 952, and 1062K. Determined onset, peak, and offset temperatures of the first dissolution reaction were 1302, 1388, and 1406K, respectively, and those values of the second dissolution reaction were 1405, 1414, and 1462K. Determined solvus temperature was 1462K. The study showed that it was possible to use a simple method to obtain accurate phase transition temperatures under isothermal condition.

Keywords

alloys;phase transformation;thermal analysis;extrapolation;precipitation

References

  1. J. M. Jang, KISTI Market Report, 2, 16 (2012).
  2. D. Furrer and H. Fecht, J. Metals, 51, 14 (1991).
  3. D. C. Madeleine, The Microstructure of Superalloys, p. 48, CRC Press, London (1997).
  4. S. E. Kim, C. C. Cho, B. Y. Hur, Y. S. Na and N. K. Park, Anal. Sci. Technol., 12, 235 (1999).
  5. Smith, Metallic Materials, revised edition, p.505-523, translated by B. H. Han, Kyobo Book Centre, Seoul, Korea (2012).
  6. M. J. Donachie and S. J. Donachie, Superalloys: A Technical Guide Second Edition, p.26-28, ASM International, Materials Park, USA (2002).
  7. T. B. Massalski, H. Okamoto, P. R. Subramanian and L. Kacprzak, Binary Alloy Phase Diagrams Second Edition, p.2865-2874, ASM International, Materials Park, USA (2007).
  8. L. A. Chapman, J. Mater. Sci., 39, 7229 (2004). https://doi.org/10.1023/B:JMSC.0000048736.86794.12
  9. R. C. Reed, The Superalloys Fundamentals and Applications, p.1-14, Cambridge University Press, New York (2006).
  10. J. E. Watson, Superalloys: Production, Properties and Applications, p.25-29, NOVA Science Publishers, New York (2011).
  11. J. R. Davis, Nickel, Cobalt, and Their Alloys p.7-17, ed. J. R. Davis, ASM International, Materials Park, USA (2000).
  12. A. Toda, K. Taguchi and K. Nozaki, Polymer, 55, 3186 (2014). https://doi.org/10.1016/j.polymer.2014.05.009
  13. A. Toda and M. Konishi, Thermochim. Acta, 589, 262 (2014). https://doi.org/10.1016/j.tca.2014.05.038
  14. M. I. Pope and M. D. Judd, Differential Thermal Analysis, Ch.6, Heyden & Son Ltd, London (1977).
  15. J. Dobrovska, S. Zia and F. Kavicka, Proceedings of the ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis, 101 (2012).