Metallurgical Transactions A

, Volume 10, Issue 9, pp 1273–1284

The effect of austenitizing temperature upon the microstructure and mechanical properties of experimental Fe/Cr/C steels

  • M. F. Carlson
  • B. V. Narasimha Rao
  • G. Thomas
Transformations
  • 320 Downloads

Abstract

The present study investigates the as-quenched mechanical propertiesviz, strength, ductility and sharp notch (KIc) as well as blunt notch (Charpy) toughness, of simple Fe/Cr/C alloys with and without titanium as a function of austenitizing temperature. For the ternary Fe/Cr/C alloys the results are consistent with earlier investigations, but the fracture toughness does not change with increasing austenitizing temperatures after 0.2 wt pct Ti is added. The titanium forms carbides (TiC) that did not dissolve, providing a roughly constant number of crack nucleation sites, and preventing austenite grain growth up to 1100°C. The differences in mechanical behavior, particularly the rounded notch toughness, are discussed and explained in terms of the microstructural characteristics of the alloys, as determined by detailed electron microscopy analysis.

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References

  1. 1.
    V. F. Zackay, E. R. Parker, R. D. Goolsby, and W. E. Wood:Nature (London) Phys. Sci., 1972, vol. 236, p. 188.CrossRefGoogle Scholar
  2. 2.
    G. Clark, R. O. Ritchie, and J. F. Knott:Nature (London) Phys. Sci., 1972, vol. 239, p. 104.CrossRefGoogle Scholar
  3. 3.
    J. McMahon: Report No. LBL-1181, Lawrence Berkeley Laboratory, University of California, Berkeley, California, 1973.Google Scholar
  4. 4.
    T. Tom: Report No. LBL-1856, Lawrence Berkeley Laboratory, University of California, Berkeley, California, 1973.Google Scholar
  5. 5.
    R. O. Ritchie and J. F. Knott:Met. Trans., 1974, vol. 5, p. 782.CrossRefGoogle Scholar
  6. 6.
    G. Y. Lai, W. E. Wood, R. A. Clark, V. F. Zackay, and E. R. Parker:Met. Trans., 1974, vol. 5, p. 1663.CrossRefGoogle Scholar
  7. 7.
    W. E. Wood:Eng. Fract. Mech., 1975, vol. 7, p. 219.CrossRefGoogle Scholar
  8. 8.
    E. R. Parker and V. F. Zackay:Eng. Fract. Mech., 1975, vol. 7, p. 371.CrossRefGoogle Scholar
  9. 9.
    M. F. Carlson, B. V. N. Rao, R. O. Ritchie, and G. Thomas:Proc. 4th Intl. Conf. on the Strength of Metals and Alloys, vol. 2, p. 509, Nancy, France, 1976.Google Scholar
  10. 10.
    J. L. Youngblood and M. Raghavan:Met. Trans. A, 1977, vol. 8A, p. 1439.CrossRefGoogle Scholar
  11. 11.
    D. S. McDarmaid:Metals Technol., 1978, vol. 4, p. 7.Google Scholar
  12. 12.
    J. McMahon and G. Thomas:Proc. Int. Conf. Microstructure and Design of Alloys, vol. 1, p. 180, Cambridge, Inst. of Metals, London, 1973.Google Scholar
  13. 13.
    E. R. Parker and V. F. Zackay:Eng. Fract. Mech., 1975, vol. 7, p. 371.CrossRefGoogle Scholar
  14. 14.
    R. O. Ritchie, B. Francis, and W. L. Server:Met. Trans. A, 1976, vol. 7A, p. 831.CrossRefGoogle Scholar
  15. 15.
    R. O. Ritchie, B. Francis, and W. L. Server:Met. Trans. A, 1977, vol. 8A, p. 1197.CrossRefGoogle Scholar
  16. 16.
    W. C. Ferguson, N. E. Clark, and B. R. Watson:Metals Technol., 1976, vol. 3, p. 208.Google Scholar
  17. 17.
    J. P. Naylor and R. Blondeau:Met. Trans. A, 1976, vol. 7A, p. 891.CrossRefGoogle Scholar
  18. 18.
    W. E. Wood:Met. Trans. A, 1977, vol. 8A, p. 1195.CrossRefGoogle Scholar
  19. 19.
    R. O. Ritohie and R. M. Horn:Met. Trans. A, 1978, vol. 9A, p. 331.CrossRefGoogle Scholar
  20. 20.
    J. R. Rice: Report No. E39, Division of Engineering, Brown University, Providence, Rhode Island, 1967.Google Scholar
  21. 21.
    A. S. Tetelman, T. R. Wilshaw, and C. A. Rau, Jr.:Int. J. Fract. Mech., 1968, vol. 4, p. 147.Google Scholar
  22. 22.
    C. G. Chipperfield and J. F. Knott:Metals Technol., 1975, vol. 2, p. 45.Google Scholar
  23. 23.
    S. K. Das and G. Thomas:Trans. ASM, 1969, vol. 62, p. 659; D. Huang and G. Thomas:Met. Trans., 1971, vol. 2, p. 1587; M. Raghavan and G. Thomas:Met. Trans., 1971, vol. 2, p. 3433.Google Scholar
  24. 24.
    G. Thomas:Iron Steel Int., 1973, vol. 46, p. 451.Google Scholar
  25. 25.
    G. Thomas.Battelle Colloquium on Fundamental Aspects of Structural Alloy Design, R. I. Jaffee and B. A. Wilcox, eds., Plenum Pub. Co., NY, 1977.Google Scholar
  26. 26.
    R. A. Clark and G. Thomas:Met. Trans. A, 1975, vol. 6A, p. 969.Google Scholar
  27. 27.
    B. V. N. Rao and G. Thomas:Mater. Sci. Eng., 1975, vol. 20, p. 195.CrossRefGoogle Scholar
  28. 28.
    G. Thomas:Mat. Trans., 1971, vol. 2, p. 2373.CrossRefGoogle Scholar
  29. 29.
    B. V. Narasimha Rao and G. Thomas:Met. Trans. A, in press.Google Scholar
  30. 30.
    S. Freeman:Effect of Second Phase Particles on the Mechanical Properties of Steel, p. 152, Proc. ISI, London, 1971.Google Scholar
  31. 31.
    R. S. Jackson:J. Iron Steel Inst., 1970, vol. 193, p. 163.Google Scholar
  32. 32.
    T. Wada, H. Wada, J. F. Elliott, and J. Chipman:Met. Trans., 1972, vol. 3, p. 2865.CrossRefGoogle Scholar
  33. 33.
    G. Thomas and B. V. N. Rao:Proc. Int. Conf. on Martensite Transformation, p. 57; Kiev, Naukora (Ukrain) USSR, 1978, Also: Report No. LBL-6242, Lawrence Berkeley Laboratory, University of California, Berkeley, California, May, 1977.Google Scholar
  34. 34.
    G. V. Kurdjumov and G. Sachs:Z. Phys., 1930, vol. 64, p. 325.CrossRefGoogle Scholar
  35. 35.
    Y. A. Bagaryatskii:Dokl. Akad. Nauk. SSSR, 1950, vol. 73, p. 1161.Google Scholar
  36. 36.
    B. J. Schulz and C. J. McMahon:Met. Trans., 1973, vol. 4, p. 2485.CrossRefGoogle Scholar
  37. 37.
    R. O. Ritchie and J. F. Knott:Met. Trans., 1974, vol. 5, p. 782.CrossRefGoogle Scholar
  38. 38.
    J. R. Rice:J. Appl. Mech., 1968, vol. 35, p. 379.Google Scholar
  39. 39.
    G. T. Han, R. G. Hoagland, and A. R. Rosenfield:Met. Trans. A. 1976, vol. 7A, p. 49.CrossRefGoogle Scholar
  40. 40.
    T. R. Wilshaw, C. A. Rau, and A. S. Tetelman:Eng. Fract. Mech., 1968, vol. 1, p. 191.CrossRefGoogle Scholar
  41. 41.
    D. P. Clausing:Int. J. Fract. Mech., 1970, vol. 6, p. 85.Google Scholar
  42. 42.
    J. P. Naylor and P. R. Krahe:Met. Trans., 1974, vol. 5, p. 1699.CrossRefGoogle Scholar
  43. 43.
    J. P. Naylor:Met. Trans. A, in press.Google Scholar
  44. 44.
    B. V. Narasimha Rao, R. W. Miller, and G. Thomas:Proc. 16th Intl. Heat Treatment Conf., p. 75, The Metals Soc., London, 1976.Google Scholar

Copyright information

© The Metallurgical of Society of AIME 1979

Authors and Affiliations

  • M. F. Carlson
    • 1
  • B. V. Narasimha Rao
    • 2
  • G. Thomas
    • 3
  1. 1.Boeing Commercial Airplane CompanySeattle
  2. 2.Materials and Molecular Research Division, Lawrence Berkeley LaboratoryUniversity of CaliforniaBerkeley
  3. 3.Department of Materials and Science and EngineeringUniversity of CaliforniaBerkeley

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