Study on Small Punch Test of China A508-3 Steel Material Irradiated by Fast Neutron at 10×1019 cm-2

Small punch test is more and more used in the field of mechanical properties evaluation of nuclear materials because of the advantages of small sampleinduced radioactivity caused by the small size of the test sample required. In this paper, a set of small punch test device to directly measure the deformation of the sample using a grating ruler was designed, which has a significantly improved accuracy compared with the conventional device. Using this device, a small punch test was carried out on China A5083 steel with a fast neutron flux of 10×1019 cm-2(E≥1 MeV). The test method for preparation and testing of radioactive samples was explored and obtained. The relationship between the yield, tensile characteristic value and ductilebrittle transition temperature of the small punch of China A5083 steel material and the standard test was obtained.