Abstract
ABSTRACT To explore the effect of weld geometry on irradiation damage and irradiation hardening, three different groove types of 316 L austenitic stainless steel welds were exposed to H+ irradiation. Testing consisted of exposure to 5-MeV to a dose of 6.2 × 1017 ions/cm2 at 400°C by means of atomic force microscope (AFM), scanning electron microscope (SEM), grading incident X-ray diffraction (GIXRD), transmission electron microscope (TEM), tensile testing and Nano-indentation. The results show that after irradiation, defects such as voids, dislocation loops, and precipitates were produced in the three weld metals. The double U-groove weld has the characteristics of small heat input, smaller grain structure, and higher grain boundary density, which hinders the movement of dislocations, vacancy clusters, precipitates, and other defects, making the defect distribution inside the weld more uniform and smaller, resulting in better mechanical properties before and after irradiation. It is a feasible idea and method to improve the irradiation damage resistance and irradiation hardening resistance of weld by changing the shape of welding groove to refine the grain.
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