Thermal shock fatigue behaviors of various W-0.5 wt%ZrC materials under repetitive transient heat loads
Thermal shock fatigue behaviors of various W-0.5 wt%ZrC materials under repetitive transient heat loads
复制标题
热%20冲击%20疲劳%20行为%20of%20各种%20W-0.5wt%ZrC%20材料%20下%20重复%20瞬态%20热%20负载
DOI：
10.1016/j.jnucmat.2020.152152
复制
发表时间：
2020
影响因子：
3.1
通讯作者：
Xiong Y.
中科院分区：
文献类型：
--
作者：
Wang M. M.;Xie Z. M.;Deng H. W.;Liu R.;Yang J. F.;Zhang T.;Wang X. P.;Fang Q. F.;Liu C. S.;Liu X.;Xiong Y.
通过模拟瞬态热事件等聚变装置中的边缘局域化模式，研究了由0.2 μm（0.2WZC）、0.5 μm（0.5WZC）和2.8 μm（2.8WZC）钨粉制备的一系列轧制W-0.5wt%ZrC材料（WZC）的抗热震疲劳性能。所制备的三种不同试样在重复（100次发射）瞬时热载荷下表现出不同的开裂阈值和开裂模式。0.2WZC和0.5WZC的开裂门槛值在0.22- 0.33GW/m ~ 2之间，而2.8WZC的开裂门槛值小于0.22GW/m ~ 2。此外，再结晶降低了热冲击疲劳抗力，导致裂纹门槛值降低和裂纹密度增加。拉伸试验结果表明，无论是沿着轧制方向还是横向，0.2WZC和0.5WZC的极限抗拉强度都相当，且处于较高水平，而2.8WZC的极限抗拉强度较小。提出了抗热震性、显微组织和拉伸性能之间的关系。
Thermal shock fatigue resistance behaviors of a series of rolled W-0.5 wt%ZrC materials (WZC) fabricated using tungsten powders with different powder grain sizes of 0.2 μm (0.2WZC), 0.5 μm (0.5WZC) and 2.8 μm (2.8WZC) were investigated by simulating the effects of edge-localized modes in fusion devices like transient heat events on these WZC specimens. The as prepared three different specimens exhibit different cracking thresholds and cracking patterns under repetitive (100 shots) transient heat loads. The cracking thresholds of the as-rolled 0.2WZC and 0.5WZC are in the range of 0.22–0.33 GW/m2, but <0.22 GW/m2for the case of 2.8WZC. Moreover, recrystallization reduces the thermal shock fatigue resistance and leads to the decrease of cracking thresholds and the increase of cracking densities. Tensile results show that both along the rolling and transverse directions, the as-rolled 0.2WZC and 0.5WZC have the comparable ultimate tensile strengths (UTS) in a relatively high level, but the as-rolled 2.8WZC has smaller ones. The correlation between the thermal shock resistance, microstructures and tensile properties has been proposed.