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Journal of Materials Science

, Volume 52, Issue 8, pp 4197–4209 | Cite as

Effect of alloying on interfacial energy of precipitation/matrix in high-chromium martensitic steels

  • A. Fedoseeva
  • E. Tkachev
  • V. Dudko
  • N. Dudova
  • R. Kaibyshev
Interfaces and Intergranular Boundaries

Abstract

The effect of cobalt, tungsten, and boron on interfacial energy of precipitate/ferritic matrix in the 9% Cr martensitic steels on the base of creep tests at 650 °C under different applied stresses ranging from 80 to 220 MPa was investigated. An interfacial energy of M23C6 carbides, the Laves phase particles, and MX carbonitrides was estimated by comparison of theoretical curves obtained by Prisma software for the model steels for the exposure time of 2 × 104 h with experimental data measured by TEM in the gage sections of crept specimens. Addition of 3 wt% Co to Co-free 9Cr2W steel led to about 1.7 times increase in the interfacial energy of M23C6 carbides and MX carbonitrides, whereas Co did not effect on the interfacial energy of the Laves phase. Increasing W from 1.5 to 3 wt% in the Co-containing steels led to increase in the interfacial energy of the Laves phase up to 0.78 J m−2 under long-term exposure, whereas it did not effect on the interfacial energy of M23C6 carbides and MX carbonitrides. In the steel with increased B up to 0.012 wt% and decreased N to 0.007 wt%, a strong decrease in the interfacial energy of M23C6 carbides to 0.12 J m−2 occurred. Change in the interfacial energy of the precipitates was analyzed in comparison with coarsening rate constant.

Keywords

Interfacial Energy Lave Phase Ferritic Matrix M23C6 Carbide Prior Austenite Grain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors acknowledge with gratitude the financial support received through the Russian Science Foundation, under Grant No. 14-29-00173. The authors are grateful to the staff of the Joint Research Center, Belgorod State University, for their assistance with instrumental analysis.

Compliance with ethical standards

Conflict of interest statement

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • A. Fedoseeva
    • 1
  • E. Tkachev
    • 1
  • V. Dudko
    • 1
  • N. Dudova
    • 1
  • R. Kaibyshev
    • 1
  1. 1.Belgorod State UniversityBelgorodRussia

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