Issues »  Volume 40, Issue 5

Creeping of Welded Joints of Steam Pipelines

A. V. Glushko, V. V. Dmytryk, T. A. Syrenko

National Technical University ‘Kharkiv Polytechnic Institute’, 21 Kyrpychov Str., 61002 Kharkiv, Ukraine

Received: 11.07.2017; final version - 10.04.2018. Download: PDF

The results of studying the features of structural changes of welded joints of steam pipes from heat-resistant pearlitic Cr–Mo–V steels operated for a long time under the conditions of creeping are presented. The role of the influence of physicochemical processes occurring within the metal of welded joints of steam pipes on their structural changes is shown. The deformation of the metal of welded joints, which is ensured by the displacement of dislocations, is the largest in the area of incomplete recrystallization of their heat-affected zone (HAZ). The creep rate is mainly controlled by the displacement of dislocations and is dependent on the structural state of the metal of welded joints. The increase in the deformation of the metal of welded joints operated for a long time under the conditions of creeping of about 200000 hours is linear, and after, their time-dependent deformation character differs from the linear one.

Key words: welded steam-pipe joints, displacement of dislocations, creep, activation energy, deformation, structure, damageability.

URL: http://mfint.imp.kiev.ua/en/abstract/v40/i05/0683.html

DOI: https://doi.org/10.15407/mfint.40.05.0683

PACS: 61.72.Hh, 62.20.Hg, 81.20.Vj, 81.40.Lm, 83.10.Tv, 83.50.Lh, 83.85.Tz

Citation: A. V. Glushko, V. V. Dmytryk, and T. A. Syrenko, Creeping of Welded Joints of Steam Pipelines, Metallofiz. Noveishie Tekhnol., 40, No. 5: 683—700 (2018) (in Russian)

REFERENCES
  1. V. V. Dmytryk, O. V. Sobol, M. A. Pohrebnoi, and T. A. Syrenko, Avtomaticheskaya Svarka, No. 7: 12 (2015) (in Russian). Crossref
  2. F. A. Khromchenko, Resurs Svarnykh Soedineniy Paroprovodov [Resource of Welded Joints of Steam Pipelines] (Moscow: Mashinostroenie: 2002) (in Russian).
  3. A. Glushko, Eastern-European Journal of Enterprise Technologies, 6, No. 1 (84): 14 (2016). Crossref
  4. V. V. Dmitrik and T. A. Syrenko, Avtomaticheskaya Svarka, No. 10: 22 (2012) (in Russian).
  5. J. P. Hirth and J. Lothe, Teoriya Dislokatsiy [Theory of Dislocations] (Moscow: Atomizdat: 1972) (Russian translation).
  6. T. Suzuki, H. Yoshinaga, and Sh. Takeuchi, Dinamika Dislokatsiy i Plastichnost' [Dislocation Dynamics and Plasticity] (Moscow: Mir: 1989) (Russian translation).
  7. V. V. Dmitrik, E. D. Grinchenko, and T. O. Syrenko, Welding International, 25, No. 11: 368 (2011). Crossref
  8. Metodicheskie Ukazaniya po Metallograficheskomu Analizu pri Otsenke Kachestva i Issledovanii Prichin Povrezhdeniy Svarnykh Soedineniy Paroprovodov iz Staley 12Kh1MF i 15Kh1M1F Teplovykh Elektrostantsiy, MU 34-70-161-87 (Moscow: VTI: 1987) (in Russian).
  9. Instruktsiya o Poryadke Obsledovaniya i Prodlenii Sroka Sluzhby Paroprovodov Sverkh Parkovogo Resursa. SO 153-34.17.470-2003 (Moscow: TsPTI ORGRES: 2004) (in Russian).
  10. S. O. Firstov and T. G. Rogul, Metallofiz. Noveishie Tekhnol., 39, No. 1: 33 (2017) (in Russian). Crossref
  11. V. V. Dmitrik, T. A. Syrenko, S. N. Bartash, and A. V. Glushko, Eastern-European Journal of Enterprise Technologies, 6, No. 1 (78): 13 (2015) (in Russian). Crossref
  12. V. V. Dmitrik, A. V. Glushko, and T. A. Syrenko, Avtomaticheskaya Svarka, No. 7: 19 (2017) (in Russian). Crossref
  13. V. V. Dmitrik and V. N. Baumer, Metallofiz. Noveishie Tekhnol., 29, No. 7: 937 (2007) (in Russian).

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