Irradiation effects on precipitation and its impact on the mechanical properties of reduced-activation ferritic/martensitic steels
Irradiation effects on precipitation and its impact on the mechanical properties of reduced-activation ferritic/martensitic steels
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DOI：
10.1016/j.jnucmat.2007.03.167
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发表时间：
2007-08
影响因子：
3.1
通讯作者：
H. Tanigawa;H. Sakasegawa;N. Hashimoto;R. Klueh;M. Ando;M. Sokolov
中科院分区：
文献类型：
--
作者：
H. Tanigawa;H. Sakasegawa;N. Hashimoto;R. Klueh;M. Ando;M. Sokolov
此前有报道称，低活化铁素体/马氏体钢（RAFs）在573K至5dpa辐照后，其韧脆转变温度（DBTT）和屈服应力发生了不同程度的变化。对辐照钢的析出行为进行了研究，发现辐照诱导析出的存在，在辐照温度为573K时，辐照诱导析出似乎是被迫达到热平衡状态。在本研究中，通过对提取复制品进行透射电镜分析，以分析析出物的尺寸分布。结果表明，硬化水平乘以平均块尺寸的平方根与提取的沉淀重量呈线性关系。这种相关性表明，辐照硬化的差异是由辐照过程中块状、包状和先验奥氏体晶界的析出行为不同引起的。简单的Hall-Petch定律可以适用于解释这种依赖关系。
It was previously reported that reduced-activation ferritic/martensitic steels (RAFs) showed a variety of changes in ductile–brittle transition temperature (DBTT) and yield stress after irradiation at 573K up to 5dpa. The precipitation behavior of the irradiated steels was examined and the presence of irradiation induced precipitation which works as if it was forced to reach the thermal equilibrium state at irradiation temperature 573K. In this study, transmission electron microscopy was performed on extraction replica specimens to analyze the size distribution of precipitates. It turned out that the hardening level multiplied by the square root of the average block size showed a linear dependence on the extracted precipitate weight. This dependence suggests that the difference in irradiation hardening between RAFs was caused by different precipitation behavior on block, packet and prior austenitic grain boundaries during irradiation. The simple Hall–Petch law could be applicable for interpreting this dependence.