Skip to main content
Log in

Microstructure in low-carbon low-alloy high-strength pipe steel

  • Published:
Steel in Translation Aims and scope

Abstract

The microstructure of a broad range of low-carbon low-alloy high-strength pipe steels produced by thermomechanical treatment is studied by transmission electron microscopy. Such steels consist of a mixture of various types of ferrite matrix with high-carbon phases and structural components. The classification of the structures is refined, with separate consideration of the components forming the low-carbon ferrite matrix and the high-carbon components that appear as isolated regions and also as layers and inclusions in bainitic ferrite. A deformational dilatometer is used to determine the temperatures ranges in which the various phases and structural components are formed.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. Efron, L.I. and Nastich, S.Yu., Sheet and Coil Production for Spiral-Seam Pipe of Strength Classes up to X100, Byul. NTI, 2006, no. 11(1283), pp. 68–81.

  2. Asahi, H., Hara, T., Sugiyama, M., et al., Development of Plate and Seam Welding Technology for X120 Linepipe, Proceedings of the Thirteenth (2003) International Offshore and Polar Engineering Conference, Honolulu, Hawaii, 2003, pp. 19–25.

  3. Lobodyuk, V.A. and Estrin, E.I., Martensitnye prevrashcheniya (Martensitic Transformation), Moscow: Fizmatlit, 2009.

    Google Scholar 

  4. Davenport, E.S. and Baine, E.C., Transformation of Austenite at Constant Subcritical Temperatures, Trans. AIME, 1930, vol. 90, p. 117.

    Google Scholar 

  5. Bhadeshia, H.K.D.H., Bainite in Steels: Transformation, Microstructure and Properties, London: IOM Communications, 2001, 2nd ed., pp. 63–71.

    Google Scholar 

  6. Bramfitt, B.L. and Speer, J.G., A Perspective on the Morphology of Bainite, Metal Trans. A, 1990, vol. 21, pp. 817–829.

    Article  Google Scholar 

  7. Ohtani, H., Okaguchi, S., Fujishiro, Y., et al., Morphology and Properties of Low-Carbon Bainite, Metall. Mater. Trans A, vol. 21, no. 4, pp. 877–888.

  8. Guide to Light Microscope Examination of Ferritic Steel Weld Metals, 1988, IIW Document IX-1533-88/IXJ 123, revision 2.

  9. Krauss, G. and Thompson, S.W., Ferritic Microstructures in Continuously Cooled Low- and Ultralow-Carbon Steels, ISIJ Intern., 1995, vol. 35, no. 8, pp. 939–940.

    Google Scholar 

  10. Araki, T., Kozasu, I., Tankechi, H., et al., Atlas of Bainite Microstructures, Tokyo: ISIJ, 1995, vol. 1, 1992.

  11. Banadkouki, G.S. and Dunne, D., Formation of Ferritic Products during Continuous Cooling of a Cu-Bearing HSLA Steel, ISIJ Intern., 2006, vol. 46, no. 5, pp. 759–768.

    Article  CAS  Google Scholar 

  12. Zayac, S., Schwinn, W., and Tacke, K.-H., Characterization and Quantification of Complex Bainitic Microstructures in High and Ultrahigh Linepipe Steels, Mater. Sci. Forum, 2005, vol. 500–501, pp. 387–394.

    Google Scholar 

  13. Smirnov, M.A., Pyshmintsev, I.Yu., and Boryakova, A.N., Classification of the Microstructures in Low-Carbon Pipe Steel, Metallurg, 2010, no. 7, pp. 45–51.

  14. Thompson, S.W., Colvin, D.J., and Krauss, J., Continuous Cooling Transformations and Microstructure in a Low-Carbon High-Strength Low-Alloy Plate Steel, Met. Trans. A, 1990, vol. 21, no. 4, pp. 1493–1507.

    Article  Google Scholar 

  15. Olasolo, M., Uranga, P., Rodriguez-Irabe, J.-M., and Lopez, B., Effect of Austenite Microstructure and Cooling Rate on Transformation Characteristics in Low-Carbon Nb-V Microalloyed Steels, Mater. Sci. Eng. A, 2010, vol. 528, pp. 2559–2569.

    Google Scholar 

  16. Babu, S.S. and Bhadeshia, H.K.D.H., Mechanism of Transformation from Bainite to Acicular Ferrite, Mater Trans., 1991, vol. 32, no. 8, pp. 679–688.

    CAS  Google Scholar 

  17. Schastlivtsev, V.P., Rodionov, D.M., Khlebnikova, Yu.V., et al., Structure and Crystallography of Rack Martensite in Structural Steel, Perspektivnye materialy. Struktura i metody issledovaniya (Promising Materials: Structure and Methods of Investigation), Meerson, Ed., TGU-MISiS, 2006, p. 536.

  18. Furuhara, T., Morito, S., and Maki, T., Morphology, Substructure and Crystallography of Lath Martensite in Fe-C Alloys, J. Phys. IV (France), 2003, vol. 112, pp. 255–258.

    Article  CAS  Google Scholar 

  19. Thomas, G. and Rao, B.V.N., Morphology, Crystallography, and Formation of Dislocated (Lath) Martensite in Steels, in: Martensitnye prevrashcheniya (doklady mezhdunarodnoi nauchnoi konferentsii ICOMAT-77) (Martensitic Transformations: Proceedings of ICOMAT-77 Conference), Kiev: Naukova Dumka, 1978, pp. 57–64.

    Google Scholar 

  20. LaPera, F.S., Improved Etching Technique for the Determination of Percent Martensite in High-Strength Dual Phase Steels, J. Metallogr., 1979, no. 12, pp. 263–268.

  21. Santanna, P.C., Rizzo, E.M., Gomes, S.I.N., et al., Fracture Toughness of the API 5L X65 Steel, Submitted to Intercritical Heat Treatment, Proceedings of Twenty-First Conference on Offshore Mechanics and Arctic Engineering (OMAE’02), Oslo, Norway, 2002, pp. 2–3.

  22. Matrosov, M.Yu., Kichkina, A.A., Efimov, A.A., et al., Simulation of Structure Formation in Pipe Steel under Controlled Rolling with Accelerated Cooling, Metallurg, 2007, no. 7, pp. 52–58.

  23. Gourgues, A.F., Flower, H.M., and Lindley, T.C., Electron Backscattering Diffraction Study of Acicular Ferrite, Bainite, and Martensite Steel Microstructure, Mater. Sci. Technol., 2000, vol. 16, no. 1, pp. 26–41.

    Article  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Additional information

Original Russian Text © M.Yu. Matrosov, I.V. Lyasotskii, A.A. Kichkina, D.L. D’yakonov, A.A. Efimov, 2012, published in “Stal’,” 2012, No. 1, pp. 65‐74.

About this article

Cite this article

Matrosov, M.Y., Lyasotskii, I.V., Kichkina, A.A. et al. Microstructure in low-carbon low-alloy high-strength pipe steel. Steel Transl. 42, 84–93 (2012). https://doi.org/10.3103/S0967091212010135

Download citation

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.3103/S0967091212010135

Keywords

Navigation