The effect of annealing temperature on the helium (He) bubble evolution after He implantation and their hardening effect were systematically studied by transmission electron microscopy (TEM) and tensile tests. A plate made of 316L austenitic stainless steel was implanted with 1000 appm He at 300 °C and then post-implantation annealed from 650 to 1000 °C for 1h. The TEM investigations showed that increasing the annealing temperature, the average bubble size increased and the density decreased. The average He bubble size and distribution in the grain interior and on the grain boundary (GB) were similar in the range of temperatures studied. In both cases, bubbles grew by the Ostwald ripening mechanism. The results suggest that the coarsening mechanism might also depend on the initial bubble size rather than only on the annealing temperature. No preferential He build-up takes place in the GBs. The increase of yield stress at 0.2% strain produced by He bubbles was calculated and compared to tensile test results. The hardening coefficients obtained using distinct models are consistent with simulations in published data.

通过透射电子显微镜（TEM）和拉伸试验系统地研究了退火温度对He注入后氦（He）气泡演化及其硬化效果的影响。将316L奥氏体不锈钢制成的板在300°C下注入1000 appm He，然后从650到1000°C退火1h。TEM研究表明，提高退火温度，平均气泡尺寸增加，密度降低。在所研究的温度范围内，平均He气泡大小和在晶粒内部以及在晶界（GB）上的分布相似。在这两种情况下，气泡都是通过奥斯特瓦尔德（Ostwald）成熟机制而生长的。结果表明，粗化机理还可能取决于初始气泡的大小，而不仅取决于退火温度。在GB中没有优先的He积累。计算了He气泡在0.2％应变下产生的屈服应力增加，并将其与拉伸试验结果进行了比较。使用不同模型获得的硬化系数与已发布数据中的模拟一致。