Journal of Materials Science

, Volume 52, Issue 5, pp 2974–2988 | Cite as

Creep behavior and microstructure of a 9Cr–3Co–3W martensitic steel

Original Paper
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Abstract

Microstructure evolution under long-term aging and creep was studied in a 9wt%Cr–3wt%Co–3wt%W martensitic steel at a temperature of 650 °C and stress ranging from 100 to 220 MPa with a step of 20 MPa. This steel exhibited creep strength breakdown at an applied stress of 160 MPa and a rupture time of 1703 h. However, this creep strength breakdown did not coincide with the transition from short-term creep conditions to long-term creep, because deviation from the Monkman–Grant relationship occurs at a minimal strain rate of ~3 × 10−6 h−1, and the acceleration of the creep rate by strain, dln \( \dot{\varepsilon }_{r} \)/dε, in the acceleration region at applied stresses of 120 and 100 MPa significantly differs from the acceleration at greater applied stresses. The transition from short-term creep to long-term creep correlates with the strain-induced coarsening of the M23C6 carbides and the Laves phase particles, which leads to dissolution of the fine particles and the growth of coarse particles of these phases at the lath boundaries. With a decrease in the applied stress, the overall Zener drag force exerted by the boundary particles decreases below the critical value of 0.12 MPa, and the tempered martensitic lath structure transforms to a subgrain structure.

Keywords

Applied Stress M23C6 Carbide Minimum Creep Rate Rupture Time Lath Boundary 
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.
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Notes

Acknowledgements

This study was financially supported by the Russian Science Foundation, under Grant No. 14-29-00173. The authors are grateful to Dr. V. Skorobogatykh and Dr. I. Shchenkova, Central Research Institute for Machine-Building Technology, for supplying the test material, and to the staff of the Joint Research Center, Belgorod State University, for their assistance with instrumental analysis.

Compliance with ethical standards

Conflict of interest

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

  1. 1.Belgorod State UniversityBelgorodRussia

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