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Outline
Focusing on the irradiation service demands of key structural materials in the nuclear power sector， this research delves into the evolution of mechanical properties in 316L stainless steel produced vialaser additive manufacturing when subjected to 3.5 MeV iron ion irradiation. The samples are fabricated using two distinct laser additive manufacturing processes： selective laser melting（SLM） and directed energy deposition（DED）. Subsequently， a comprehensive pre-irradiation analysis is conducted， encompassing microstructural examination， X-ray diffraction（XRD）， and nanoindentation tests under varying doses of iron ion irradiation.Microstructural observations revealed that the SLM samples exhibit fine cellular austenite structures， whereas the DED samples display coarse columnar grains with some ferrite precipitation. XRD analysis demonstrate that both sample types retain austenite as the predominant phase before and after irradiation， with no phase transformation detected， thus indicating their excellent phase stability. The nanoindentation results show that the hardness of the SLM samples increases from 2.81 GPa to 4.33 GPa， representing an approximate 54% rise. In contrast， the hardness of the DED samples rises from 2.70 GPa to 4.10 GPa， equating to an approximate 52% increase. Notably， the DED samples exhibit only a limited hardness improvement （approximately 7.6%） within the dose range of 1-10 dpa， suggesting an earlier onset of hardening saturation. By integrating the analysis with the strain gradient plasticity model， the differences in irradiation hardening under varying doses are clarified.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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