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奥氏体不锈钢是超临界水冷堆的堆内构件的候选材料之一,本文实验以奥氏体不锈钢AL-6XN为对象,研究了氢离子辐照对奥氏体钢微观结构的影响.在290℃和380℃下用100keV的H+2辐照,辐照剂量分别为0.5dpa和1.0dpa(displacement per atom).在290℃下,随辐照剂量增加,位错环平均直径从3.8nm增加到5.6nm,数密度略有下降.在380℃下辐照,产生了大尺寸位错环,随着剂量增加,位错环平均直径和数密度显著增加.实验结果表明,氢离子辐照AL-6XN不锈钢产生的缺陷主要是位错环,随辐照剂量增加,产生的位错环尺寸增大,提高辐照温度有利于位错环的迁移和聚集长大.
Austenitic stainless steel is one of the candidate materials for in-reactor components of supercritical water-cooled reactor. In this paper, the effect of hydrogen ion irradiation on microstructure of austenitic steel was studied in austenitic stainless steel AL-6XN. And irradiation dose of 0.5dpa and 1.0dpa (displacement per atom) at 100keV and 380 ℃, respectively.The mean diameter of dislocation loops increased from 3.8nm at 290 ℃ with the increase of radiation dose To 5.6nm, a slight decrease of the number density.When irradiated at 380 ℃, a large dislocation ring was produced, with the increase of the dose, the average diameter and number density of dislocation loops increased significantly.The experimental results show that hydrogen ion irradiation AL The defects produced by -6XN stainless steel are mainly dislocation loops. As the irradiation dose increases, the size of dislocation loops increases. Increasing the irradiation temperature is favorable for the migration and aggregation of dislocation loops.