Thermal shock damage of tungsten as a plasma facing material (PFM) depends on thermal shock power density level, duration and repeated time, and microstructure of the sample. The recrystallization process will degrade the mechanical property of material and thus change the its thermal shock resistance. The effects of recrystallization volume fraction on thermal shock response of W-Y₂O₃ under different power density levels (0.22–0.44 GW/m²) has been systematically studied. Electron beam pulse of duration of 1 ms with 100 recycles was used to simulate the transient thermal load of fusion device. The changes of morphology, distance, depth, width of crack and surface roughness on the rolling direction-normal direction (RD-ND) surfaces of W-Y₂O₃ samples with different recrystallization volume fraction were investigated. The results showed that recrystallization process have significant influence on the thermal shock resistance of W-Y₂O₃ samples. For the rolled sample, crack depth, width and surface roughness increased with the increased of power density level while crack distance decreased. The partially and fully recrystallized samples showed significant wider crack networks and severe surface modification.

钨作为等离子体材料（PFM）的热冲击损伤取决于热冲击功率密度水平，持续时间和重复时间以及样品的微观结构。重结晶过程将降低材料的机械性能，从而改变其耐热冲击性。已经系统地研究了在不同功率密度水平（0.22-0.44 GW / m ²）下，再结晶体积分数对WY ₂ O _3的热冲击响应的影响。电子束脉冲的持续时间为1 ms，具有100次循环，用于模拟聚变设备的瞬态热负荷。WY ₂轧制方向-法线方向（RD-ND）表面的形貌，距离，深度，裂纹宽度和表面粗糙度的变化研究了具有不同重结晶体积分数的O ₃样品。结果表明，再结晶过程对WY ₂ O ₃样品的抗热震性有显着影响。对于轧制样品，裂纹深度，宽度和表面粗糙度随功率密度水平的增加而增加，而裂纹距离则减小。部分和完全重结晶的样品显示出明显的更宽的裂纹网络和严重的表面改性。