Materials Science

, Volume 35, Issue 4, pp 499–508 | Cite as

Effect of high-temperature degradation of heat-resistant steel on the mechanical and fractographic characteristics of fatigue crack growth

  • O. Z. Student
  • W. Dudziński
  • H. M. Nykyforchyn
  • A. Kamińska


We study the influence of degradation of 12Kh1MF heat-resistant steel under service and laboratory conditions on the variation of the threshold characteristics of its crack resistance and fractographic characteristics of the near-threshold growth of a fatigue crack. It is shown that hydrogen dissolved in the metal intensifies its cracking in the prefracture zone, first, along the grain boundaries and then, when the time of contact between the metal and hydrogenating media becomes sufficiently large, along the boundaries of subgrains, which leads to a stable decrease in the effective thresholdKtheff. The process of fragmentation of the damaged metal by secondary cracks is a typical feature of crack growth with the threshold rate. The longer the contact of the metal with the hydrogenating medium, the lower the growth rate for which the fracture surface contains fatigue grooves and the larger the opening displacement of crack lips decorating these grooves. Hydrogen also facilitates the shift of the regions of tunnel crack growth relative to the corresponding areas on the conjugated fracture surfaces and, thus, increases the level ofKthcl. The actions of the factorsKtheff andKthcl are mutually compensating and, therefore, it is impossible to determine the actual influence of hydrogen on the cyclic crack-growth resistance of the damaged metal by analyzing only the value ofKth.


Fatigue Fracture Surface Fatigue Crack Fatigue Crack Growth Crack Resistance 
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  1. 1.
    I. Masaoka, K. Kinoshita, R. Chiba, et al., “Hydrogen attack limit of 2.25Cr-1Mo steel,”Weld. Res. Conuc. Bull.,305, 1–8 (1985).Google Scholar
  2. 2.
    E. I. Krutasova,Reliability of the Metal of Power-Generating Equipment [in Russian], Énergoizdat, Moscow (1981).Google Scholar
  3. 3.
    J. Fellous (editors),Fractography and Atlas of Fractographs, ASM, New York (1974).Google Scholar
  4. 4.
    H. M. Nykyforchyn, O. Z. Student, and B. P. Loniuk, “Sensitivity of fatigue crack growth in a reactor steel to thermomechanical ageing in hydrogen environment,” in:Proc. Symp. on Fatigue under Thermal and Mechanical Loading: Mechanisms, Mechanics, and Modeling, (Petten 1996), Kluwer, Dordrecht (1996), pp. 215–220.Google Scholar
  5. 5.
    O. Z. Student and B. P. Lonyuk, “Fatigue crack growth in 15Kh2MFA steel held in high-temperature hydrogen,”Fiz-Khim. Mekh. Mater.,33, No. 4, 121–126 (1997).Google Scholar
  6. 6.
    H. M. Nykyforchyn and O. Z. Student, “Thermocycling in hydrogen environment as simulation method of pipeline steam steel's damages,” in:Proc. of the 12th Biennial European Conf. on Fracture (ECF-12, Sheffield, 1998), Vol. 3, EMAS, London (1998), pp. 1139–1144.Google Scholar
  7. 7.
    V. I. Tkachev, V. I. Holodny, and I. N. Levina,Serviceability of Steels and Alloys in Hydrogen [in Russian], Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, L'viv (1999).Google Scholar
  8. 8.
    V. I. Pokhmurskii and V. B. Fedorov,Effect of Hydrogen on the Diffusion Processes in Metals [in Russian], Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, L'viv (1998).Google Scholar
  9. 9.
    O. Z. Student and B. P. Lonyuk, “Express method for the high-temperature aging of steels,”Fiz.-Khim. Mekh. Mater.,33, No. 6, 111–112 (1997).Google Scholar
  10. 10.
    H. M. Nykyforchyn, O. Z. Student, B. P. Loniuk, and D. Milanović, “Damage kinetics in materials for power equipment and its effect on fatigue fracture characteristics,” in:Materials Ageing and Component Life Extension: Proc. Internat. Symp. (Milan, 1995) Vol. 1, EMAS, Warley (1995), pp. 1153–1162.Google Scholar
  11. 11.
    O. Z. Student, “Accelerated method for hydrogen degradation of structural steels,”Fiz.-Khim. Mekh. Mater.,34 No. 4, 45–52 (1998).Google Scholar
  12. 12.
    O. N. Romaniv, E. A. Shur, A. N. Tkach, V. N. Siminkovich, and T. N. Kiseleva, “Kinetics and mechanisms of fatigue crack growth in iron,”Fiz-Khim. Mekh. Mater.,17, No. 2, 158–166 (1981).Google Scholar
  13. 13.
    V. S. Ivanova and V. F. Terent'ev,Fatigue of Metals and Its Nature [in Russian], Metallurgiya, Moscow (1975).Google Scholar
  14. 14.
    M. Klesnil and P. Lucas,Fatigue of Metallic Materials, Academia, Prague (1980).Google Scholar
  15. 15.
    T. Ogura, T. Masumoto, and J. Imami, “Transmission electron microscope study of the structure around fatigue cracks of α-iron,”Trans. Jpn. Inst. Metals,17, No. 11, 733–742 (1976).Google Scholar
  16. 16.
    V. M. Goritskii and V. F. Terent'ev,Structure and Fatigue Fracture of Metals [in Russian], Metallurgiya, Moscow (1980).Google Scholar
  17. 17.
    A. B. Mitchell and D. G. Teer, “The analysis of dislocation structures in fatigued aluminium single crystals exhibiting striations,”Phil. Mag.,22, No. 176, 399–417 (1970).Google Scholar
  18. 18.
    P. J. Woods, “Low-amplitude fatigue of copper and copper-5 at % aluminum single crystals,”Phil. Mag.,28, No. 1, 155–191 (1973).Google Scholar
  19. 19.
    D. V. Wilson and J. K. Tromans, “Effect of strain ageing on fatigue damage in low-carbon steel,”Acta Met.,18, 1197–1208 (1970).Google Scholar
  20. 20.
    Y. Bergstrom, “A dislocation model for the stress-strain behaviour of polycrysttalline α-Fe with special emphasis on the variation of the densities of mobile and immobile dislocations,”Mater. Sci. Eng.,5, No. 4, 193–200 (1970).Google Scholar
  21. 21.
    O. N. Romaniv and Yu. V. Zyma, “Quantitative microfractography of the fatigue fracture of metals and alloys,” in:Standardization of the Method of Fractography for the Evaluation of the Rate of Fatigue Fracture in Metals [in Russian], Issue 5, Izd. Standartov, Moscow (1984), pp. 6–36.Google Scholar
  22. 22.
    A. Ya. Krasovskii, O. P. Ostash, V. A. Stepanenko and S. Ya. Yarema, “Influence of low temperatures on the rate and microfractographic characteristics of fatigue crack growth in low-carbon steel,”Probl. Prochn.,4, 74–78 (1977).Google Scholar
  23. 23.
    V. S. Ivanova and A. A. Shanyavskii,Quantitative Fractography [in Russian], Metallurgiya, Chelyabinsk (1988).Google Scholar
  24. 24.
    H. G. Nelson, “Hydrogen embrittlement,” in: C. L. Briant and S. K. Banerji (editors),Treatise on Materials Science and Technology: Embrittlement of Engineering Alloys, Vol. 25, Academic Press, New York (1983), pp. 256–333.Google Scholar

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© Kluwer Academic/Plenum Publishers 2000

Authors and Affiliations

  • O. Z. Student
  • W. Dudziński
  • H. M. Nykyforchyn
  • A. Kamińska

There are no affiliations available

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