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Modification in the Microstructure of Mod. 9Cr-1Mo Ferritic Martensitic Steel Exposed to Sodium

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Abstract

Mod. 9Cr-1Mo is used as the structural material in the steam generator circuit of liquid metal-cooled fast breeder reactors. Microstructural modifications on the surface of this steel are investigated after exposing to flowing sodium at a temperature of 798 K (525 °C) for 16000 hours. Sodium exposure results in the carburization of the ferritic steel up to a depth of ~218 µm from the surface. Electron microprobe analysis revealed the existence of two separate zones with appreciable difference in microchemistry within the carburized layer. Differences in the type, morphology, volume fraction, and microchemistry of the carbides present in the two zones are investigated using analytical transmission electron microscopy. Formation of separate zones within the carburized layer is understood as a combined effect of leaching, diffusion of the alloying elements, and thermal aging. Chromium concentration on the surface in the α-phase suggested possible degradation in the corrosion resistance of the steel. Further, concentration-dependent diffusivities for carbon are determined in the base material and carburized zones using Hall’s and den Broeder’s methods, respectively. These are given as inputs for simulating the concentration profiles for carbon using numerical computation technique based on finite difference method. Predicted thickness of the carburized zone agrees reasonably well with that of experiment.

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Acknowledgement

The authors thank Dr. P.R. Vasudeva Rao, Director IGCAR and Dr. T. Jayakumar, Director, Metallurgy and Materials Group, IGCAR for their encouragement and support throughout the period of this project.

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Authors and Affiliations

  1. Physical Metallurgy Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, Tamilnadu, India

    T. N. Prasanthi (Scientific Officer-D), Cheruvathur Sudha (Scientific Officer-F), V. Thomas Paul (Scientific Officer-E), S. Saroja (Scientific Officer-H+) & M. Vijayalakshmi (Scientific Officer-OS)

  2. Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603102, Tamilnadu, India

    N. Sivai Bharasi (Scientific Officer-D)

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  1. T. N. Prasanthi
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  2. Cheruvathur Sudha
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Correspondence to Cheruvathur Sudha.

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Manuscript submitted June 19, 2013.

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Prasanthi, T.N., Sudha, C., Paul, V.T. et al. Modification in the Microstructure of Mod. 9Cr-1Mo Ferritic Martensitic Steel Exposed to Sodium. Metall Mater Trans A 45, 4220–4234 (2014). https://doi.org/10.1007/s11661-014-2361-7

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