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Measurement of Surface Segregations in Structural Steels


Development of an Auger Spectroscopy Method for Measurement of Phosphorus Intergranular Segregations in PWR Reactor Pressure Vessel Steels

Tech Area / Field

  • FIR-MAT/Materials/Fission Reactors

3 Approved without Funding

Registration date

Leading Institute
NIIAR (Atomic Reactors), Russia, Ulianovsk reg., Dimitrovgrad


  • EDF / Recherche et Dévelopement, France, Moret-sur-Loing

Project summary

Objective: Investigation of phosphorus intergranular segregations in a model alloy fabricated on the basis of Pressurized Water Reactor (PWR) vessel materials but with increased phosphorus concentration.

Main task: Development of methodical procedures to have a sufficient fraction of the intergranular fracture on the fracture surface of model alloy samples fabricated on the basis of PWR vessel materials but with increased phosphorus concentration, a system of methods to protect the fresh fracture surface from oxidation when transferring the samples into the high-vacuum chamber of Auger-spectrometer and investigation of the phosphorous intergranular segregation. Experimental study of elemental composition of grain boundaries will be carried out.

Field of science: Reactor material science

Expected results and effect of their application:

In the course of the Project implementation, the Auger-spectrometric methods for investigation of phosphorous intergranular segregations on the samples of the model alloy fabricated on the basis of PWR vessel materials but with increased phosphorus concentration will be mastered. These methods may be used to examine irradiated samples. The experimental data on phosphorous intergranular segregation in the model alloy will be obtained.

The mastered methods will allow investigations of intergranular segregations on irradiated samples. The obtained results will contribute to the experimental database on justification of the possible usage of such alloys as structural materials of nuclear power reactors.


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