Abstract
The mechanical properties of metals which were subjected to high temperatures or neutron irradiation decrease drastically during a long period of service. The small punch test (SPT) was introduced, by which various material properties could be obtained from a fairly small disk specimen, with an almost non-destructive method, from an in-service pressure vessel. However, due to the relatively thin samples, the microdefects which may have a severe effect on the small punch samples may present little effect on the conventional large sample. In this paper, Q345R and Q235A steels were used to carry out SPT in order to study the effect of microdefects on the mechanical properties. The effects of microdefect on the load–displacement curve of SPT were investigated. The result shows that Q235A steel has obvious microdefects and shows scattering in load–displacement curves and rough fracture morphology. The microdefects have an obvious effect on the ultimate strength and have no effect on the yielding strength. The finite element analysis result shows good accordance with the test result.
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