In this study, we investigated the material properties of tungsten mono-blocks undergone high heat flux test. The ITER-like tungsten mono-block specimens were fabricated by two kinds of joining methods. The tungsten-Cu interlayer joint was made by gas pressure casting and Cu interlayer-CuCrZr cooling tube were joined by hot radial pressing (HRP) or brazing method. To evaluate the integrity of the fabricated mono-blocks, high heat flux tests were done on the small mockups under cyclic heat load of 10 MW/m² up to 5,000 cycles. We measured the microstructure, hardness, and surface state of the tungsten armors before and after the heat flux exposure experiment. The Vickers hardness profile measured from the surface down to the Cu interlayer showed a noticeable reduction around 200 μm ~ 500 μm depth after high heat flux test compared to that before the test depending on the bonding quality of mockup specimens. At depth beyond 800 μm, the Vickers hardness did not show any notable difference before and after the high heat flux test, which indicates the material property of tungsten is not so much affected in this region at the above heat flux condition. The microstructure and grain size distribution was measured and analyzed by SEM and EBSD. The correlation between the microstructure and hardness profile, and the impacts of the mockup performance under HHF test to the integrity of tungsten armors are analyzed.

在这项研究中，我们研究了经过高热通量测试的钨单块的材料性能。ITER状的钨单块试样是通过两种连接方法制成的。钨-铜层间接头通过气压铸造制成，铜层间-CuCrZr冷却管通过热径向压制（HRP）或钎焊方法连接。为了评估所制造整体的完整性，在循环热负荷为10 MW / m ^2的情况下，对小型模型进行了高热通量测试。最多5,000个循环。我们在热通量暴露实验之前和之后测量了钨铠装的微观结构，硬度和表面状态。根据样机样品的粘结质量，从高热通量测试到从表面向下到Cu中间层的维氏硬度曲线显示，与测试之前相比，在200μm〜500μm深度处有明显的降低。在深度超过800μm时，维氏硬度在高热通量测试之前和之后均未显示任何显着差异，这表明在上述热通量条件下，钨的材料性能在该区域受的影响不大。通过SEM和EBSD测量并分析了显微组织和晶粒尺寸分布。显微组织和硬度分布之间的相关性，