Advertisement

Journal of Materials Science

, Volume 31, Issue 14, pp 3847–3852 | Cite as

Austenitic grain size evolution and continuous cooling transformation diagrams in vanadium and titanium microalloyed steels

  • F. Peñalba
  • C. Garcia De Andres
  • M. Carsi
  • F. Zapirain
Article

Abstract

The evolution of the austenitic grain size in medium carbon steels microalloyed with vanadium and titanium was studied as a function of reheating temperature, heating rate, and titanium content. High resolution dilatometric techniques were used to determine the continuous cooling transformation (CCT) diagrams for two different austenitization temperatures. The microstructure and hardness were determined for different cooling rates. The results revealed a significant effect of titanium concentration on the austenitic grain growth control. The smallest grain size was found in the steel with a Ti concentration = 0.019 wt%. Low heating rates produced smaller grain sizes than high heating rates although an abnormal grain growth took place. In these steels, at temperatures above 1050 °C the influence of the reheating temperature on their hardness for cooling rates around 2 °C · s−1 was negligible. The higher reheating temperatures caused a slight increase in their hardenability. Finally, it was found that the greater the titanium content, the greater the hardness of these steels, but only when the titanium percentages were higher than 0.020 wt%.

Keywords

Titanium Vanadium Cool Rate Carbon Steel Titanium Content 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    F. PEÑALBA, “Influencia de la deformación controlada de la austenita sobre las propiedades mecánicas de aleaciones férreas hipoeutectoides dopadas con vanadio y titanio. Acción de la precipitación de sus compuestos”. Doctoral Thesis. Complutense University of Madrid. Physics Faculty, Madrid, (1991).Google Scholar
  2. 2.
    C. GARCìA, M. CARSì, F. PEÑALBA and M. P. De ANDRÉS, J. Mater. Sci. 27 (1992) 4567.CrossRefGoogle Scholar
  3. 3.
    F. PEÑALBA, M. CARSì, C. GARCìA and F. ZAPIRAIN, Mem'. Et. Sci. Rev. Met. 2 (1991) 77.Google Scholar
  4. 4.
    F. PEÑALBA, M. CARSì, C. GARCìA, F. ZAPIRAIN and M. P. De ANDRÉS, ISIJ Int. 32 (1992) 232.CrossRefGoogle Scholar
  5. 5.
    M. CARSÍ, F. PEÑALBA and I. GUTIÉRREZ, J. Mater. Sci 28 (1993) 6450.CrossRefGoogle Scholar
  6. 6.
    F. PEÑALBA, M. CARSì, C. GARCìA, F. ZAPIRAIN and M. P. De ANDRÉS, in proceedings of the International Conference on Recristallization and Related Phenomena, edited by M. FUENTES and J. GIL (Trans. Tech. Publication, Switzerland, 1993), p. 447.Google Scholar
  7. 7.
    H. OSAZU, T. SHIRAGA, Y. SHIROI, Y. TANIGUCHI, K. TSUJIMURA and H. KIDO, “SAE Tech. Paper Series 860131” (Int. Soc. of Automotive Eng., Detroit, 1986), p. 1.Google Scholar
  8. 8.
    A. ROSSI, A. MASCANZONI, G. CRISPOLDI and F. De MEO, “Fundamentals of Microalloying Forging Steels”, edited by G. KRAUS and S. K. BANERJI (The Met. Soc. of AIME, Warrendale, PA. 1987), p. 351.Google Scholar
  9. 9.
    T. GLADMAN, Proc. Roy. Soc. A. (1966) 294.Google Scholar
  10. 10.
    J.M. WOODHEAD, “Fundamentals of Microalloying Forging Steels”, edited by G. KRAUS and S. K. BANERJI (The Met. Soc. of AIME, Warrendale, PA 1987), p. 3.Google Scholar
  11. 11.
    S.S. HARSEN, ibid.“, p. 155.Google Scholar
  12. 12.
    W. ROBERTS, in proceedings of HSLA Steels, Technology and Applications (ASM, Ohio, 1984), p. 33.Google Scholar
  13. 13.
    G. T. ELDIS and W. C. HAGEL, “Hardenability Concepts with Applications to Steel”, edited by D. V. DOANE and J. S. KIRKALDY (The Met. Soc. of AIME, Warrendale, PA. 1978), p. 397.Google Scholar
  14. 14.
    T. SAMPEY, in proceedings of “HSLA Steels Technology and Applications edited by ASM (ASM, Ohio, 1984), p. 1063.Google Scholar
  15. 15.
    G. MÄSCHER, J. SCHMIDT and J. WOLFF, “Information Day on Mircoalloyed Steels” (Commision of the European Communities, Düsseldorf, 1988), paper 9.Google Scholar
  16. 16.
    “Atlas Zur Wärmebehandlung Der Stähle” (Verlag Stahleisen mbH, Düsseldorf, 1954/56/58), II-103 E.Google Scholar
  17. 17.
    M. KORCHYNSKY,“Proceeding, Microestructure and properties of HSLA Steels” (The Min., Metals and Mat. Soc., Warrendale PA, 1988), p. 169.Google Scholar
  18. 18.
    D. J. NAYLOR, “Information day on Mircoalloyed steels” (Commision of the European Communities, Dusseldorf 1988) paper 14.Google Scholar

Copyright information

© Chapman & Hall 1996

Authors and Affiliations

  • F. Peñalba
    • 1
  • C. Garcia De Andres
    • 1
    • 2
  • M. Carsi
    • 1
    • 2
  • F. Zapirain
    • 1
  1. 1.INASMETSan SebastianSpain
  2. 2.CENIM (CSIC)MadridSpain

Personalised recommendations