In-core or cladding structural materials exposed to heavy ion irradiation often suffer serious irradiation-induced damages. Introducing defect sinks can effectively mitigate irradiation-induced degradation in materials. Here, we investigated the radiation response of additively manufactured 316 austenitic stainless steel with high-density solidification cellular structures via in situ Kr⁺⁺ irradiation at 400°C to 5 dpa. The study shows that the cellular walls with trapped dislocations can serve as effective defect sinks, thus reduce dislocation loop density compared with the conventional coarse-grained counterparts. This study provides a positive step for the potential applications of radiation-resistant, additively manufactured steels in advanced nuclear reactors.

暴露于重离子辐照下的堆芯或包层结构材料通常遭受严重的辐照诱导破坏。引入缺陷汇可以有效地减轻辐射引起的材料降解。在这里，我们通过在400°C至5 dpa的原位Kr ⁺⁺辐照研究了具有高密度凝固孔结构的增材制造316奥氏体不锈钢的辐射响应。研究表明，位错被困的孔壁可以作为有效的缺陷沉，从而与传统的粗粒相较之下降低了位错环的密度。这项研究为先进的核反应堆中抗辐射的增材制造钢的潜在应用提供了积极的一步。