The helium-cooled concept with solid breeding materials is one of the candidates for demonstration fusion power reactor (DEMO) breeding blanket. The first wall (FW) is a core component of the breeding blanket. The FW should keep the structural integrity during the normal plasma operation which is subject to high surface heat flux, neutron wall load, and high coolant pressure simultaneously. Various fabrication methods have been studied for the development of the FW fabrication technologies. This study focuses on FW fabrication technologies with hot isostatic pressing (HIP) bonding which is considered as the most promising method for achieving such complex shape like FW having internal cooling channels. We investigated the HIP bonding conditions using Advance Reduced Activation Alloy, ARAA, which is a reduced activation ferritic-martensitic steel under development in Korea. Temperature, holding time and pressure were considered as the parameters to optimize the HIP bonding conditions. The microstructures around the HIP joints changed with respect to the HIP bonding temperature. The amount of oxide particles around the HIP joints varied depending on the degassing conditions. The tensile strength of the HIP joint was not greatly affected by the presence of the HIP bonding line and degassing conditions. On the other hand, it has been confirmed that the Charpy absorbed energy of the HIP joint was significantly affected by degassing conditions. An increase in oxide particles around the HIP joints occurred when degassing temperature and vacuum level were low, and as the quantity of oxide particles increased, the Charpy absorbed energy of the HIP joint decreased substantially.

中文翻译：

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ARAA热等静压制作养殖毯第一壁的条件研究

采用固体增殖材料的氦冷却概念是示范聚变反应堆（DEMO）增殖毯的候选方案之一。第一壁（FW）是繁殖毯的核心组成部分。 FW 应在正常等离子体运行期间保持结构完整性，同时承受高表面热通量、中子壁负载和高冷却剂压力。为了开发 FW 制造技术，人们对各种制造方法进行了研究。本研究重点关注采用热等静压 (HIP) 粘合的 FW 制造技术，该技术被认为是实现具有内部冷却通道的 FW 等复杂形状的最有前途的方法。我们使用高级低活化合金 (ARAA) 研究了 HIP 粘合条件，ARAA 是韩国正在开发的一种低活化铁素体-马氏体钢。温度、保持时间和压力被认为是优化 HIP 粘合条件的参数。 HIP 接头周围的微观结构随着 HIP 粘合温度的变化而变化。 HIP 接头周围的氧化物颗粒量随脱气条件的不同而变化。 HIP 接头的拉伸强度不受 HIP 粘合线的存在和脱气条件的很大影响。另一方面，已证实HIP接头的夏比吸收能受脱气条件的显着影响。当脱气温度和真空度较低时，HIP接头周围的氧化物颗粒增多，并且随着氧化物颗粒数量的增加，HIP接头的夏比吸收能大幅下降。