Abstract:

High heat flux test of ITER divertor W/Cu monoblock mock-ups were finished. All tested mock-ups successfully withstood the heat cycles above and met the requirements of high heat flux performances specified by IO. After HHF test, the post analysis was performed on tested mock-ups. The results found the debonding of the Cu/CuCrZr interface and the crack of W. The scanning electron microscope (SEM) image of the break shows that intergranular rupture was the main mechanism of the W crack. The recrystallization was observed in the W monoblocks and the recrystallized depth was estimated by metallography analysis. The temperature distribution was also obtained by finite element analysis and a good correspondence with recrystallization observed by experiment was found.

Key words: ITER, High heat flux, Divertor, W/Cu mock-ups

摘要：

对ITER偏滤器钨/铜穿管模块进行了高热负荷测试。测试结果表明，所有的模块都成功承受住了热负荷测试并满足了IO的要求。在高热负荷测试后，对模块进行了事后分析。发现了钨的纵向开裂和Cu/CuCrZr界面的开焊现象。断口的SEM图像表明，钨的开裂方式为脆性的沿晶开裂。通过金相学分析，发现了钨的再结晶现象和钨表面的再结晶深度。还通过有限元分析软件模拟得到了模块的温度分布，并且与实验观察的再结晶现象能够很好的对应。

关键词: ITER, 高热负荷, 偏滤器, 钨/铜模块