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Thermal embrittlement of 18 Ni(350) maraging steel

  • Mechanical Behavior
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Abstract

The embrittlement of as-solutionized 18 Ni(350) Maraging steel was monitored as a function of heat treatment variables by means of Charpy impact tests. The processing parameters of interest were annealing temperatures in the range of 1900° to 2400°F, intermediate holding temperatures in the range of 1300° to 1800°F, and the quenching rate. The changes in fracture mode with heat treatment were characterized by replica and scanning electron microscopy. The severity of thermal embrittlement increases with decreasing cooling rate from the annealing treatment upon direct quenching to room temperature. Intermediate isothermal holding, particularly at 1500° to 1600°F, further accentuates the embrittlement. A large grain size is beneficial to the toughness when rapid direct quenches from the annealing range are imposed but is detrimental upon air cooling or intermediate holding. The major loss in toughness may be associated with the diffusion of interstitial impurity atoms (C+N) to the austenite grain boundaries during cooling or intermediate isothermal holding below 2000°F. An advanced stage of the embrittlement is characterized by the discrete precipitation of Ti(C,N) platelets on these boundaries. Thermal embrittlement is accompanied by change in fracture mode from transgranular dimpled rupture to intergranular quasi-cleavage.

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References

  1. J. E. Campbell: DMIC Report S-28, June 1969, pp. 8–16.

  2. C. J. Barton, B. G. Reisdorf, P. H. Salmon Cox, J. M. Chilton, and C. E. Oskin: AFML-TR-67-34, 1967.

  3. G. J. Spaeder:Met. Trans., 1970, vol. 1, pp. 2011–14.

    Article  CAS  Google Scholar 

  4. G. W. Tuffnell and R. L. Cairns:ASM Trans. Quart., 1968, vol. 61, pp. 798–806.

    CAS  Google Scholar 

  5. H. J. Rack and David Kalish:Met. Trans., to be published.

  6. J. M. Capus:Am. Soc. Testing Mater., Spec. Tech. Publ. No. 407, 1968, pp. 3–19.

  7. R. Schuhmann, Jr.:Met. Eng., vol. 1, Chap. 8, Addison-Wesley Press, 1952.

  8. J. Crank:Mathematics of Diffusion, pp. 42–61, Oxford, 1956.

  9. G. R. Speich:Trans. TMS-AIME, 1969, vol. 245, pp. 2553–64.

    CAS  Google Scholar 

  10. H. Scott:Trans. ASM, 1934, vol. 22, pp. 68–96.

    Google Scholar 

  11. C. Wells, W. Batz, and R. F. Mehl:Trans. AIME, 1950, vol. 188, pp. 553–60.

    CAS  Google Scholar 

  12. B. A. Nevzorov and O. V. Starkor:Fiz.-Chim. Mekh. Mater., 1967, vol. 3, pp. 257–60.

    CAS  Google Scholar 

  13. J. D. Fast and M. B. Verrijp:J. Iron Steel Inst., 1954, vol. 176, pp. 24–27.

    CAS  Google Scholar 

  14. K. Bohnekamp:Arch. Eisenhuettenw., 1967, vol. 38, pp. 229–32.

    Google Scholar 

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Authors and Affiliations

  1. Lockheed-Georgia Co., Marietta, Ga.

    David Kalish (Scientists) & H. J. Rack (Scientists)

Authors
  1. David Kalish
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  2. H. J. Rack
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Additional information

This paper was presented at the 1970 Spring Meeting of The Metallurgical Society of AIME in Las Vegas, Nev.

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Kalish, D., Rack, H.J. Thermal embrittlement of 18 Ni(350) maraging steel. Metall Trans 2, 2665–2672 (1971). https://doi.org/10.1007/BF02814910

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  • DOI: https://doi.org/10.1007/BF02814910

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