Recrystallization and thermal shock fatigue resistance of nanoscale ZrC dispersion strengthened Walloys as plasma-facing components in fusion devices
Recrystallization and thermal shock fatigue resistance of nanoscale ZrC dispersion strengthened Walloys as plasma-facing components in fusion devices
复制标题
纳米级 ZrC 弥散强化瓦合金作为聚变装置中面向等离子体组件的再结晶和抗热冲击疲劳性能
DOI：
10.1016/j.jnucmat.2017.09.022
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发表时间：
2017
影响因子：
3.1
通讯作者：
L. H. Cai
中科院分区：
文献类型：
--
作者：
Z.M. Xie;S. Miao;R. Liu;L. F. Zeng;T. Zhang;Q. F. Fang;C. S. Liu;X. P. Wang;Y. Y. Lian;X. Liu;L. H. Cai
研究了纳米ZrC弥散强化块体钨合金（W-0.5wt%ZrC，WZrC）的再结晶和抗热震疲劳性能。采用热处理等时实验，系统研究了钨晶粒尺寸/取向、第二相颗粒分布、热导率和力学性能的演变。研究了边缘局域模瞬态热事件对轧制态和再结晶态WZrC的影响。来自持续时间为1 ms的电子束的脉冲被用来模拟聚变装置中的瞬态热负荷。研究了100次瞬态热载荷作用下的开裂门槛值、开裂机理和再结晶行为。结果表明，在室温下，所有WZrC样品的开裂门槛值为220-330 MW/m2（对应于热负荷参数F = 7.0-10.4 MJ/m2 s1/2），在热负荷参数为10.4 MJ/m2 s1/2时发生热轰击诱导再结晶。
Recrystallization and thermal shock fatigue resistance behavior of nanoscale ZrC dispersion strengthened bulk tungsten alloys (W-0.5 wt% ZrC, WZrC) as potential candidates for plasma-facing components were investigated. By employing heat treatments with isochronal experiments, the evolution of the tungsten grain size/orientation, second phase particle distribution, thermal conductivity and mechanical properties were systematically studied. The effects of edge-localized mode like transient heat events on the as-rolled and recrystallized WZrC were investigated carefully. Pulses from an electron beam with durations of 1 ms were used to simulate the transient heat loading in fusion devices. The cracking thresholds, cracking mechanisms and recrystallization under repetitive (100 shots) transient heat loads were investigated. Results indicate that the cracking threshold of all the WZrC samples is 220–330 MW/m2(corresponding to a heat load parameter F = 7.0–10.4 MJ/m2s1/2) at room temperature and the heat bombardment induced recrystallization occurs at a heat parameter of 10.4 MJ/m2s1/2.