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Microstructural Characterisations of Static Strain Ageing in C-Mn Steel Welds of the Secondary Circuit of Pressurized Water Reactors

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Abstract:

C-Mn steel welds of the secondary circuit of pressurised water reactors might be subjected to static strain ageing (SSA) due to the segregation of free interstitial atoms, especially nitrogen, on dislocations at temperatures of 250°C-300°C in operating conditions. Thus, several parameters such as the initial free nitrogen content and the amount of prestrain are likely to affect the sensitivity of the material to SSA, both influences being investigated in this paper. To this end, a broad experimental campaign based on internal friction (IF) measurements was conducted to follow the evolutions of the solute content. Preliminary studies emphasized the presence of nitrogen solutes in the as-welded material, whose content tends to increase from 250°C to 300°C due to the dissolution of ε carbonitrides. Regarding the parametric study of SSA, it was shown that the amount of segregated nitrogen first increases with the amount of prestrain or the initial concentration of nitrogen solutes before saturating from a critical threshold. Its value depends on the other parameter, leading to either no effect, a continuous increase or an increase before saturation of segregation. Therefore, a cross influence of both parameters was highlighted.

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Periodical:

Key Engineering Materials (Volume 1040)

Pages:

23-29

DOI:

https://doi.org/10.4028/p-3jScEj

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Online since:

January 2026

Authors:

Ronan Riverie*, Véronique Massardier, Sylvain Dancette, Ghassen Ben Salem, Déborah Clement, Stéphane Marie

Keywords:

Internal Friction, Microstructural Characterisations, Steel Weld, Strain Ageing

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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