Volume 5, Issue 4 (April 2008)
Fracture Toughness Evaluation of Eurofer97 by Testing Small Specimens
Eurofer’97 is the structural reference material that will be tested in the ITER modules. Its metallurgical properties have been well characterized during the last years. However, more investigations related to the fracture toughness of this material are needed to assess its integrity because this property is one of the most important to design structural components. In the case of structural materials for fusion reactors, the small specimen test technology is being actively developed to investigate the fracture toughness among other mechanical properties. The use of small specimens is due to the small available irradiation volume of the International Fusion Materials Irradiation Facility (IFMIF) and also due to the high fluence expected in the fusion reactor. The aim of this paper is to determine the fracture toughness of the Eurofer’97 steel by testing small specimens of different geometry in the ductile-to-brittle transition region with the application of the Master Curve methodology. The tests and data analysis have been performed following the Master Curve approach included in the ASTM Standard E1921-05, “Standard Test Method for Determination of Reference Temperature, T0, for Ferritic Steels in the Transition Range.” Specimen size effects and comparison of the fracture toughness results with available data in the literature are also discussed.