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Mechanical stability of retained austenite in tempered 9Ni steel

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Abstract

The behavior of the thermally stable austenite in the ductile fracture surface layer of a grain-refined and tempered 9Ni steel broken at 77 K was studied through use of Möss-bauer spectroscopy and transmission electron microscopy. Thin foils revealing the mi-crostructural profile of the fracture surface layer were prepared by electroplating a thick pure iron layer on the fresh fracture surface, then thinning a profile sample through a combination of conventional twin-jet electropolishing and ion milling techniques. The re-sults of both Mössbauer spectroscopy and TEM studies showed that the thermally stable austenite transforms to a dislocated martensite in the deformed zone adjacent to the duc-tile fracture surface. This result suggests that transformation of the retained austenite present in tempered 9Ni steel is compatible with low temperature toughness, at least when the transformation product is a ductile martensite.

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References

  1. S. Nagashima, T. Ooka, S. Sekino, H. Mimura,T. Fujishima, S. Yno, and H. Sakurai:Trans. Iron Steel Inst. Japan, 1971, vol. 2, p.402.

    Google Scholar 

  2. T. Ooka, H. Mimura, S. Yano, K. Sugino, and T. Toizumi:J. Jap. Inst. Metals, 1966,vol. 30, p. 442.

    CAS  Google Scholar 

  3. C. W. Marshall, R. F. Heheman, and A. R. Troiano:Trans ASM, 1962, vol 55, p.135.

    Google Scholar 

  4. D. Hardwick:Iron Steel, 1961, vol. 34, p. 414.

    CAS  Google Scholar 

  5. C. A. Pampillo and H. W. Paxton:Met. Trans., 1972, vol. 3, p. 2895.

    CAS  Google Scholar 

  6. T. Ooka and K. Sugino:J. Jap. Inst. Metals, 1966, vol. 30, p. 435.

    CAS  Google Scholar 

  7. M. Kron, A. Constant, A. Clerc, J. Plateau, G. Henry, M. Robert, and C. Crussard: Mémoires Scientifiques Rev. Metallurg., 1961, vol. 58, p. 901.

    CAS  Google Scholar 

  8. H. Haga:Trans. Iron Steel Inst. Japan, 1973, vol. 13, p.141.

    Google Scholar 

  9. K. J. Kim and L. H. Schwartz:Mater. Sci. Eng., 1978, vol. 33, p. 5.

    Article  CAS  Google Scholar 

  10. B. Fultz: unpublished results, Dept. Materials Science and Engineering, Uni-versity of California at Berkeley, Berkeley, CA, 1977.

    Google Scholar 

  11. C. K. Syn, S. Jin, and J. W. Morris, Jr.:Met. Trans. A, 1976, vol. 7A, p. 1827.

    CAS  Google Scholar 

  12. O. J. Klingenmaier:Modem Electroplating, 3rd ed., F. A. Lowenheim, ed., Chapter 10, John Wiley and Sons, New York, 1974.

    Google Scholar 

  13. See for example R. W.Hertzberg:Deformation and Fracture Mechanics of Engineering Materials, Chapter 8, John Wiley and Sons, New York, 1977.

    Google Scholar 

  14. K. R. Swanson and J. J. Spijkerman:J. Appl. Phys., 1970, vol. 41, p. 3155.

    Article  CAS  Google Scholar 

  15. H. K. Chow, R. F. Weise, and P. A. Flinn: USAEC Report NSEC4023-1,1969.

  16. L.H. Schwartz and K.J. Kim:Met. Trans. A, 1976, vol. 7A, p. 1567.

    CAS  Google Scholar 

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Authors and Affiliations

  1. Department of Materials Science and Engineering ahd the Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, 94720, Berkeley, CA

    C. K. Syn (Assistant Research Engineer), B. Fultz (Research Assistant) & J. W. Morris (Professor of Metallurgy and Principal Investigator)

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  1. C. K. Syn
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  2. B. Fultz
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  3. J. W. Morris
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Syn, C.K., Fultz, B. & Morris, J.W. Mechanical stability of retained austenite in tempered 9Ni steel. Metall Trans A 9, 1635–1640 (1978). https://doi.org/10.1007/BF02661946

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