Influence of Applied Stress on Helium Bubble Growth in Nuclear Structural Materials

为了提高新型核裂变反应堆和聚变堆候选结构材料，如Fe-Ni-Cr奥氏体钢和低活化铁素体钢的抗氦脆性，研究了高温应力作用下氦气泡组织的演变。脆化似乎发生在临界气泡理论描述的范围内。研究表明，防止晶界气泡长大是抑制脆化的有效措施，而氦捕获在晶内析出物上的作用不大。

So as to improve the helium-embrittlement-resistance of candidate structural materials for innovative nuclear fission reactors and fusion ones, such as Fe-Ni-Cr austenitics and reduced activation ferritic steels, the evolution of helium bubble microstructure has been investigated under the stress at high temperatures. The embrittlement seemed to occur as described by critical bubble theory. It has been elucidated that the prevention of bubble growth at grain boundaries should be effective to the suppression of the embrittlement while helium capturing on intragranular precipitates provides little advantage.