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Correlation of the Microstructural Factors Influence on the Impact Strength of the Weld Affected Zone of K60* Strength Class Welded Pipes

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Abstract

The degree of microstructural factors influences on the impact strength of four K60 strength class steels after simulating a thermal welding cycle in the coarse-grained area of the weld-affected zone is investigated. It has been shown that the differences between steels with different impact strength KCV–20 are mainly caused by the differences in the content and structure of titanium nitrites. In steels prone to brittle fracture, titanium nitrides act as sources of cleavage cracks origin. In the case of blocking the transition of the cleavage crack from nitride to the matrix, other less significant factors affect the impact strength. It is shown that high-angle grain boundaries stop cleavage cracks by limiting their size, which leads to a decrease in the probability of a crack crossing the grain boundary. The correlation of the impact strength with the volume fraction of the MA component particles and the residual austenite in the studied microstructures is weakly expressed. Such particles cannot be considered as localized sources of cleavage cracks. Differences in the level of Cr + Ni + Cu alloying in the studied steels, which are not characterized by the cleavage cracks origin on titanium nitride inclusions, can be considered as an important factor of impact strength. The mechanism of this influence may be associated with a change in the tendency to cleavage of the ferritic matrix.

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ACKNOWLEDGMENTS

V. A. Bozhenov assisted the authors of this work.

Funding

The work on the study of the steels’ microstructure and fractographic analysis was supported by the Ministry of Education and Science of the Russian Federation within the state task in the field of scientific activities no. 075-00328-21-00.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia

    V. V. Sudin, M. M. Kantor & K. G. Vorkachev

  2. Limited company “Vyksa Metallurgical Plant”, Vyksa, Russia

    P. P. Stepanov, L. I. Efron & S. V. Zharkov

  3. National University of Science and Technology MISiS, Vyksa, Vyksa Branch, Russia

    L. I. Efron

Authors
  1. V. V. Sudin
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  2. P. P. Stepanov
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  3. M. M. Kantor
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  4. L. I. Efron
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  5. K. G. Vorkachev
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  6. S. V. Zharkov
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Corresponding author

Correspondence to L. I. Efron.

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Sudin, V.V., Stepanov, P.P., Kantor, M.M. et al. Correlation of the Microstructural Factors Influence on the Impact Strength of the Weld Affected Zone of K60* Strength Class Welded Pipes. Steel Transl. 52, 121–128 (2022). https://doi.org/10.3103/S0967091222010223

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