Use of Tungsten Material for the ITER Divertor
Use of Tungsten Material for the ITER Divertor
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DOI：
10.1016/j.nme.2016.07.003
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发表时间：
2016-12
影响因子：
2.6
通讯作者：
T. Hirai;S. Panayotis;V. Barabash;C. Amzallag;F. Escourbiac;A. Durocher;M. Merola;J. Linke;
中科院分区：
文献类型：
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作者：
T. Hirai;S. Panayotis;V. Barabash;C. Amzallag;F. Escourbiac;A. Durocher;M. Merola;J. Linke;
由于ITER转向器设计在热负荷最大的垂直目标中包含钨块，因此必须实施保护前沿的设计以及高性能装甲-散热器接头的技术研发。在研发过程中，通过钨块组件的高热流密度测试，验证了该技术的可行性。加载20 MW/m2后，单块体中部出现不系统但频繁的宏观裂纹。这种宏观裂纹的萌生被认为是由于循环暴露于高温（~ 2000℃），其中涉及蠕变、再结晶和低周疲劳。为了了解宏观裂纹外观与力学性能之间的相关性，以及材料规范中可能更新的验收标准，开展了对钨块进行表征的活动。
Since the ITER divertor design includes tungsten monoblocks in the vertical target where heat loads are maximal, the design to protect leading edges as well as technology R&D for high performance armor-heat sink joint were necessary to be implemented. In the R&D, the availability of the technology was demonstrated by high heat flux test of tungsten monoblock components. Not systematically but frequently macro-cracks appeared at the middle of monoblocks after 20 MW/m2loading. The initiation of such macro-cracks was considered to be due to cyclic exposure to high temperature, ∼2000 °C, where creep, recrystallization and low cycle fatigue were concerned. To understand correlation between the macro-crack appearance and mechanical properties and possible update of acceptance criteria in the material specification, an activity to characterize the tungsten monoblocks was launched.