Tensile and fatigue properties of potassium doped and rhenium containing tungsten rods for fusion reactor applications
Tensile and fatigue properties of potassium doped and rhenium containing tungsten rods for fusion reactor applications
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DOI：
10.1016/j.fusengdes.2015.11.030
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发表时间：
2016-11
影响因子：
1.7
通讯作者：
W. Guan;S. Nogami;M. Fukuda;A. Hasegawa
中科院分区：
文献类型：
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作者：
W. Guan;S. Nogami;M. Fukuda;A. Hasegawa
为了开发用于聚变反应堆的高性能面向等离子体材料(PFM)，本研究对采用旋压工艺制备的大直径纯钨(PW)和掺钾W(KW)棒进行了研究。KW棒材比PW棒材具有更细小的晶粒度、更致密的[1：1：0]晶向和更均匀的晶粒度分布。KW棒的轴向拉伸试验表明，在每个试验温度下，KW棒的抗拉强度都高于PW棒。另一方面，这两种类型的杆具有几乎相同的延伸值。与轧制的PW和KW板的进一步比较表明，与W板相比，W棒的延伸率更大，强度更低。同时，用Manson的通用斜率法预测，W形杆的疲劳寿命较长。此外，本研究还研究了含3%Re的K掺杂钨棒(KW3Re)，它具有改善再结晶和晶粒长大行为的特点。在KW3Re棒材中观察到再结晶后的晶粒长大受到抑制。基于这些材料的高性能PFM可以在仔细考虑制造过程和在制造过程中使用的其他元素的情况下实现。
In this study, large diameter pure tungsten (PW) and potassium doped W (KW) rods fabricated using a swaging process were investigated, in order to develop high performance plasma-facing materials (PFM) for fusion reactor applications. The KW rods show a finer grain size, a more compact [1 1 0] grain orientation, and a more uniform grain size distribution than that of the PW rods. Tensile tests of the KW rods along the axial direction indicated higher tensile strength at each test temperature than what is found in PW rods. On the other hand, both types of rod have nearly identical elongation values. Further comparison of the rods with rolled PW and KW plates indicate that the W rods show larger elongation and lower strength than what is observed in W plates. Meanwhile, the longer fatigue life was observed for the W rods, as predicted by Manson's universal slope method. In addition, a K-doped W rod with 3% rhenium (Re) (KW3Re) was investigated in this study, which featured improved recrystallization and grain growth behavior. Suppression of grain growth after recrystallization was observed in KW3Re rod. High performance PFMs based on these materials can be expected with careful consideration of the fabrication process and additional elements used in their creation.