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

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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.

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Authors and Affiliations

  1. “L’vivs’ka Politekhnika” National University, Lviv, Ukraine

    A. R. Dzyubyk, A. A. Voitovych & L. V. Dzyubyk

  2. Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine

    L. O. Babii

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  1. A. R. Dzyubyk
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  2. A. A. Voitovych
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  3. L. V. Dzyubyk
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  4. L. O. Babii
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Correspondence to A. R. Dzyubyk.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 54, No. 2, pp. 75–81, March–April, 2018.

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Dzyubyk, A.R., Voitovych, A.A., Dzyubyk, L.V. et al. Specific Features of the Fatigue Fracture of Welded Joints of 34KhN2MA Steel Formed by Electrodes with Different Phase Compositions. Mater Sci 54, 215–222 (2018). https://doi.org/10.1007/s11003-018-0176-1

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  • DOI: https://doi.org/10.1007/s11003-018-0176-1

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