Strength and fracture toughness of reduced-activation ferritic steel (JLF-1) for fusion reactor application

Reduced activation ferritic steel, JLF-1 steel (Fe-9Cr-2W-V-Ta), is one of the promising candidate materials for fusion reactor applications. Fracture toughness (JIC) and tensile tests were carried out at room temperature and elevated temperature (400 .deg. C). Two types of CT specimen were prepared to examine the effect of rolling direction on the fracture toughness of JLF-1 steel. Four types of tensile specimen were also prepared to investigate the property by the rolling direction and welding. The Micro Vickers hardness was measured at various distances of a cross section of the TIG joints of JLF-1 steel according to the heating history of each position. Finally, the fracture surface was observed by Scanning Electron Microscopy (SEM)