Title: Ductile-to-brittle Transition Temperature of Thermally Segregated WWER-1000 Base Metal
Citation: International Journal of Microstructure and Materials Properties vol. 2 no. 3-4 p. 326-338
Publisher: Inderscience
Publication Year: 2007
JRC N°: JRC33520
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC33520
Type: Articles in periodicals and books
Abstract: A series of thermal treatments on typical WWER-1000 reactor pressure vessel base metal have been carried out in order to induce large phosphorus segregation. In particular, two conditions have been achieved with significantly different ductile-to-brittle transition temperatures, when compared to un-treated metal, and measured by means of standard Charpy impact tests. Tensile properties, hardness and other non-destructive techniques have also been investigated and when possible correlations established. This study confirms that when phosphorus segregation leads embrittlement, which is directly detected by Charpy testing, due to the non-hardening nature of the embrittlement mechanism neither hardness nor the other applied non-destructive testing (thermoelectric, magnetic Barkhausen and positron annihilation) provides substantial indication of material degradation. The results obtained are an important source of information to understand the behaviour of materials prone to phosphorus segregation; in particular for what regards their sensitivity to fracture.
JRC Directorate:Energy, Transport and Climate

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