高能重离子辐照的ODS铁素体钢脆化效应研究

发布时间：2018-01-31 12:08

  本文关键词： ODS铁素体钢 高能重离子 辐照损伤 延伸率 断裂韧性　出处：《原子核物理评论》2015年03期 　论文类型：期刊论文

【摘要】：与传统的铁素体钢相比,氧化物弥散强化(ODS)的铁素体钢具有更优的耐高温和抗辐照性能,近年来成为先进核能装置重要的候选结构材料。在HIRFL的扇聚焦型回旋加速器(SFC)材料辐照终端,对一种氧化物弥散强化(ODS)铁素体钢MA956进行了高能Ne离子辐照实验,旨在研究级联碰撞损伤和惰性气体原子注入条件下该材料力学性能的变化。利用辐照终端的能量衰减装置将SFC出口123.4 Me V的离子能量分解为介于38.5～121.0 Me V之间的30个入射能量值,并通过双面辐照在厚度60μm的样品中均匀产生了损伤。辐照剂量为9×1016ions/cm2,在样品中的平均位移损伤为0.7 dpa,注入的Ne原子浓度为350 appm。辐照期间样品温度保持在440℃附近。对辐照前后的样品分别在室温和500℃下进行了小冲杆试验(Small-punch Test),获得了辐照前后样品的加载位移曲线,由此得到该辐照条件下样品的延性损失为18%～26%。通过扫描电子显微镜观察了断口形貌和厚度变化,估算了样品的等效断裂应变和断裂韧性。结果表明,MA956钢经过高能Ne离子辐照后等延伸率减小,断裂韧性降低,样品发生了一定的脆化。透射电镜结果说明氧化物弥散相界面处微空洞的形成可能是导致脆化的原因。
[Abstract]:Compared with the traditional ferrite steel, the oxide dispersion strengthened ferrite steel has better high temperature resistance and radiation resistance. In recent years, it has become an important candidate for structural materials for advanced nuclear power plants. In HIRFL, SFC-based material irradiation terminals are used in the fan focusing cyclotron. A kind of oxide dispersion strengthened ferrite steel (MA956) was irradiated by high energy ne ion. In order to study the change of mechanical properties of the material under the condition of cascade collision damage and inert gas atom implantation, the SFC outlet 123.4 me was obtained by using the energy attenuating device of the irradiation terminal. The ion energy of V is decomposed into 30 incident energy values between 38.5 and 121.0 MeV. The average displacement damage in 60 渭 m samples was 0.7 dpa with a dose of 9 脳 10 ~ (16) ionos / cm ~ (2). The implanted ne atom concentration was 350 appm. The temperature of the samples remained around 440 鈩，

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