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利用离子辐照模拟中子辐照效应技术对AP1000安全壳用钢SA738Gr.B进行了高能氢离子辐照,采用透射电镜、聚焦离子束原位技术和正电子湮没技术,研究SA738Gr.B钢(两种热处理状态:淬火+回火态、淬火+回火+消除应力热处理(SR)态)经过高能氢离子辐照的辐照损伤行为。结果表明,在比较明显的辐照剂量下(0.2、0.5和1.0 dpa),钢基体中未观察到气泡、空位团等。两种样品的正电子湮没的寿命变化不大,说明这两种样品在试验所设计的辐照剂量下的微观缺陷变化不太明显。在位移损伤量为0.2~1.0 dpa的高能氢离子辐照下,两种热处理状态的SA738Gr.B/SA738Gr.B(SR)样品均具有良好的抗辐照肿胀能力。其中,在辐照剂量较大(0.5和1 dpa)时,SA738Gr.B样品的正电子寿命长于SA738Gr.B(SR),即SA738Gr.B样品的空位数量比SA738Gr.B(SR)更多,因此SA738Gr.B(SR)钢抗辐照性能更好。
The high-energy hydrogen ion irradiation of SA738Gr.B steel for AP1000 containment vessel was conducted by using ion irradiation simulated neutron irradiation technique. The transmission electron microscopy, focused ion beam in situ and positron annihilation technique were used to study the effect of SA738Gr.B steel (two Heat treatment conditions: quenching + tempering, quenching + tempering + stress relief heat treatment (SR) state) after irradiation by high-energy hydrogen ion irradiation damage behavior. The results showed that bubbles, vacancy clusters and the like were not observed in the steel matrix at more obvious irradiation doses (0.2, 0.5 and 1.0 dpa). The lifetime of positron annihilation of the two samples did not change much, indicating that the microscopic defects of the two samples did not change obviously under the irradiation dose designed by the experiment. The SA738Gr.B / SA738Gr.B (SR) samples in both heat treatments showed good resistance to irradiation and swelling under the irradiation of high-energy hydrogen ions with displacement damage of 0.2-1.0 dpa. Among them, the positron lifetime of SA738Gr.B samples was longer than that of SA738Gr.B (SR) at larger irradiation doses (0.5 and 1 dpa), that is, SA738Gr.B had more vacancies than SA738Gr.B (SR) So SA738Gr.B (SR) steel anti-radiation better performance.