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Materials Science

, Volume 54, Issue 2, pp 215–222 | Cite as

Specific Features of the Fatigue Fracture of Welded Joints of 34KhN2MA Steel Formed by Electrodes with Different Phase Compositions

  • A. R. Dzyubyk
  • A. A. Voitovych
  • L. V. Dzyubyk
  • L. O. Babii
Article
  • 3 Downloads

We study the cyclic crack resistance of the metal of welded joints of 34KhN2MA thick-plate steel obtained with the help of ferritic and austenitic electrodes. It is shown that the weld metal has a higher crack resistance than the base metal only within the second part of the kinetic diagrams of fatigue fracture. In the first and third parts, the characteristics of the weld metal are worse. The results of fractographic investigations demonstrate that the decrease in the fatigue crack-growth resistance in pure austenitic welds is explained by the presence of hot cracks in the zone between the near-root metal of the welded joint and the base metal. As for the mixed ferrite-austenitic welds, the decrease in the fatigue crack-growth resistance is explained by inadmissibly large slag inclusions creating additional stress concentration and deteriorating the characteristics of cyclic crack-growth resistance.

Keywords

welded joints fatigue crack growth fractographic features of fracture 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • A. R. Dzyubyk
    • 1
  • A. A. Voitovych
    • 1
  • L. V. Dzyubyk
    • 1
  • L. O. Babii
    • 2
  1. 1.“L’vivs’ka Politekhnika” National UniversityLvivUkraine
  2. 2.Karpenko Physicomechanical InstituteUkrainian National Academy of SciencesLvivUkraine

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