The irradiation damage behavior of 316L stainless steel (SS) fabricated using selective laser melting (SLM) and traditional manufacturing (TM) was investigated in terms of microstructural changes in hardness and swelling at RT under irradiation with 3 MeV Fe ions at doses of 0.3 to 6 dpa. At a dose of 6 dpa, the swelling heights of the SLM and TM samples were 39.1 nm and 30.7 nm, respectively, corresponding to swelling rates of 3.0 % and 2.4 %. The irradiated SLM 316L SS exhibited a lower degree of hardening at continuous fluences than the TM 316L SS. At a dose of 6 dpa, the hardening rates of the SLM and TM 316L SS specimens were 102.1 % and 84.1 %, respectively. Furthermore, TEM results showed that the density of dislocation loops in the TM 316L SS was 8.36 × 10/m while that in the SLM 316L SS was 6.15 × 10/m. The average sizes of the dislocation loops were 1.35 and 1.22 nm, respectively. According to calculations using the dispersed barrier hardening (DBH) model, the dislocation loops were the primary factor influencing the irradiation hardening behavior. Under Fe-ion irradiation at RT, SLM 316L SS showed superior resistance to irradiation hardening and swelling compared with TM 316L SS.

中文翻译：

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增材制造316L不锈钢Fe离子辐照损伤行为

研究了采用选择性激光熔化 (SLM) 和传统制造 (TM) 制造的 316L 不锈钢 (SS) 的辐照损伤行为，研究了在剂量为 0.3 至 3 MeV Fe 离子辐照下，硬度和室温膨胀的微观结构变化。 6 dpa。在剂量为 6 dpa 时，SLM 和 TM 样品的膨胀高度分别为 39.1 nm 和 30.7 nm，对应的膨胀率为 3.0% 和 2.4%。经辐照的 SLM 316L SS 在连续注量下表现出比 TM 316L SS 更低的硬化程度。在剂量为 6 dpa 时，SLM 和 TM 316L SS 样本的硬化率分别为 102.1% 和 84.1%。此外，TEM结果表明，TM 316L SS中的位错环密度为8.36×10/m，而SLM 316L SS中的位错环密度为6.15×10/m。位错环的平均尺寸分​​别为 1.35 和 1.22 nm。根据分散势垒硬化（DBH）模型的计算，位错环是影响辐照硬化行为的主要因素。在室温铁离子辐照下，与 TM 316L SS 相比，SLM 316L SS 显示出优异的抗辐照硬化和溶胀性能。