Nickel and Nitrogen Alloying Effects on the Strength and Toughness of Austenitic Stainless Steels at 4 K

  • R. P. Reed
  • P. T. Purtscher
  • K. A. Yushchenko
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 32)

Abstract

The tensile strength and fracture toughness at 4 K were studied as a function of Ni (6–15 wt.%) and N (0.90–0.28 wt.%) contents for eight austenitic stainless steels. Results indicate that Ni increases the tensile yield strength and decreases the fracture toughness, KIc(J), and Ni has little effect on tensile yield strength but increases the fracture toughness. The temperature dependence of the yield strength is given by σy = σo e-AT, where σo is the yield strength at O K, and A is the slope of In σy vs. T. The parameter A is proportional to the stacking fault energy. Lower Ni alloys exhibited brittle facets on fracture surfaces. The quality index, a new parameter = σy • KIc(J), relates to the capacity of the alloy to achieve greater strength or toughness, but not at the expense of the other parameter. Nickel alloying increases the quality factor; nitrogen has little effect.

Keywords

Nickel Silicate Austenite Helium Martensite 

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References

  1. 1.
    R. P. Reed and N. J. Simon, Adv. Cry.Eng.--Mater. 30:127–136 (1984).Google Scholar
  2. 2.
    R. L. Tobler, D. T. Read, and R. P. Raed, in: “Fracture Mechanics: Thirteenth Conference,” ASTM STP 743, American Society for Testing and Materials, Philadelphia (1981), pp. 250–268.Google Scholar
  3. 3.
    R. P. Reed and J. M. Arvidson, Adv. Cryo. Eng.—Mater. 30:263–270 (1984).Google Scholar
  4. 4.
    D. T. Read and R. L. Tobler, Adv. Cryo. Eng.—Mater. 28:17–28 (1982).Google Scholar
  5. 5.
    R. P. Reed and R. L. Tobler, Adv. Cryo. Eng.—Mater. 28:49–56 (1982).Google Scholar
  6. 6.
    R. L. Tobler, R. P. Reed, and D. S. Burkholter, Adv. Cryo. Eng.—Mater. 26:107–119 (1980).Google Scholar
  7. 7.
    R. P. Reed, in: “Materials at Low Temperatures,” American Society for Metals, Metals Park, Ohio (1983), pp. 295–341.CrossRefGoogle Scholar
  8. 8.
    R. L. Tobler and R. P. Reed,in: “Materials Studies for Magnetic Fusion Energy Applications at Low Temperatures—III,” NBSIR 80–1627, National Bureau of Standards, Boulder, Colorado (1980), pp. 17–48.Google Scholar
  9. 9.
    P. T. Purtscher and R. P. Reed, in “Materials Studies for Magnetic Fusion Energy Applications at Low Temperatures-VIII,” NBSIR 85–3025, National Bureau of Standards, Boulder, Colorado (1985), pp. 123–144.Google Scholar
  10. 10.
    R. L. Tobler and D. Meyn, in: “Materials Studies for Magnetic Fusion Energy Applications at Low Temperatures—VIII,” NBSIR 85–3025, National Bureau of Standards, Boulder, Colorado (1985), pp. 167–179.Google Scholar
  11. 11.
    I. Williams, R. G. Williams, R. C. Capellaro, in: “Proceedings of Sixth International Cryogenic Engineering Conference,” IPC Science and Technology Press, Guildford, Surrey, England (1976), pp. 337–341.Google Scholar
  12. 12.
    R. E. Schramm and R. P. Reed, Metall. Trans. 6A: 1345–1351 (1975).Google Scholar
  13. 13.
    G. Schoeck and A. Seeger, in: “Defects in Crystalline Solids,” The Physical Society, London (1955), pp. 340–346.Google Scholar
  14. 14.
    P. Haasen, in “Dislocations in Metals,” vol. 4 of “Dislocations in Solids,” F. R. N. Nabarro, ed., North-Holland Publishing Co., New York (1979), pp. 155–190.Google Scholar
  15. 15.
    S.-P. Hannula, H. Hanninen, and S. Tahtinen, Metall. Trans. 15A:2205–2211 (1984).Google Scholar
  16. 16.
    G. R. Caskey, in: “Fractography and Materials Science,” ASTM STP 733, American Society for Testing and Materials, Philadelphia (1981), pp. 86–97.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • R. P. Reed
    • 1
  • P. T. Purtscher
    • 1
  • K. A. Yushchenko
    • 2
  1. 1.Fracture and Deformation DivisionNational Bureau of StandardsBoulderUSA
  2. 2.E. O. Paton Institute of ElectroweldingKievUSSR

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