Journal of Materials Science

, Volume 21, Issue 9, pp 3065–3070 | Cite as

Precipitation behaviour of a sensitized AISI type 316 austenitic stainless steel in hydrogen

  • P. Rozenak
  • D. Eliezer
Papers

Abstract

The purpose of this study was to characterize the precipitation behaviour of AISI type 316 steel in hydrogen. The different precipitates (M23C6, M6C), the intermetallicχ-phase and the martensitic phase (α′,ε) were determined by using transmission electron microscopy (TEM) and X-ray diffraction techniques. All the specimens were sensitized at 650‡ C for 24 h. Some samples were carburized up to 2 wt% C. Additions of carbon content decrease the time required for sensitization. Short-term (24 h) exposure of this steel to sensitization temperature results in a complex precipitation reaction of various carbides and intermetallic phases. Hydrogen was introduced by severe cathodic charging at room temperature. This study indicates that by conventional X-ray techniques it is possible to detect those precipitates and their behaviour in a hydrogen environment. The zero shift as observed by X-ray diffraction from the carbides (M23C6, M6C) and the intermetallicχ-phase, indicates that those phases absorb far less hydrogen than the austenitic matrix. TEM studies reveal that hydrogen inducesα′ martensite at chromium-depleted grain-boundary zones, near the formation of the carbides.

Keywords

Carbide Martensite Austenitic Stainless Steel Stack Fault Energy Austenitic Matrix 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    C. L. Briant, R. A. Mulford andE. L. Hall,Corrosion 9 (1982) 468.Google Scholar
  2. 2.
    B. Weiss andR. Stickler,Met. Trans. 3 (1972) 851.Google Scholar
  3. 3.
    J. K. Lai,Mater. Sci. Eng. 58 (1983) 195.CrossRefGoogle Scholar
  4. 4.
    Idem, ibid. 61 (1983) 101.CrossRefGoogle Scholar
  5. 5.
    ASTM Standard E-112 (1977).Google Scholar
  6. 6.
    ASTM Card No. 6-0674 (χ-phase).Google Scholar
  7. 7.
    M. J. Donachie Jr andO. H. Kriege,J. Mater. JMLSA 7 (1972) 269.Google Scholar
  8. 8.
    M. L. Holzworth andM. Louthan Jr,Corrosion 24 (1968) 110.Google Scholar
  9. 9.
    P. Rozenak, L. Zevin andD. Eliezer,J. Mater. Sci. 19 (1984) 567.Google Scholar
  10. 10.
    P. Rozenak andD. Eliezer,ibid. 19 (1984) 3873.CrossRefGoogle Scholar
  11. 11.
    N. Narita, C. J. Altstetter andH. K. Birnbaum,Met. Trans. 13A (1982) 1355.Google Scholar
  12. 12.
    H. R. Kautz andGerlach,Arch Eisenhüttenw. 2 (1968) 151.Google Scholar
  13. 13.
    ASTM Card No. 14-407 (M23C6).Google Scholar
  14. 14.
    ASTM Card No. 11-546 (M6C).Google Scholar
  15. 15.
    J. S. Kaster,Acta Metall. 2 (1954) 456.CrossRefGoogle Scholar
  16. 16.
    E. R. Butler andM. G. Burke, in “Proceedings of the International Conference on Martensitic Transformations”, edited by L. Delacy and M. Chandrasekaran (Zeuven, Belgium, 1982) p. 121.Google Scholar
  17. 17.
    E. L. Hall andC. L. Briant,Met. Trans. 15A (1984) 793.Google Scholar
  18. 18.
    C. L. Briant,ibid. 10A (1979) 181.Google Scholar
  19. 19.
    A. W. Thompson,Mater. Sci. Eng. 14 (1974) 253.CrossRefGoogle Scholar

Copyright information

© Chapman and Hall Ltd. 1986

Authors and Affiliations

  • P. Rozenak
    • 1
  • D. Eliezer
    • 1
  1. 1.Department of Materials EngineeringBen Gurion University of the NegevBeer ShevaIsrael

Personalised recommendations