纳米压痕技术研究堆内构件材料304NG不锈钢的三束辐照效应

摘要

在中国原子能科学研究院的三束辐照实验平台上,对国产堆内构件材料核级控氮304NG不锈钢进行重离子、氢和氦同时辐照,并采用连续刚度纳米压痕技术测量了辐照前后样品的硬度和弹性模量的变化.结果表明,6 dpa下,随着辐照温度的升高,辐照硬化减弱;300 ℃下,随着辐照剂量的增加,辐照硬化增大,高剂量情况下,氢、氦注入区的辐照硬化更显著,表明存在氢、氦增强硬化效应.%Utilizing the heavy ion,hydrogen and helium triple beam irradiation experiment platform at China Institute of Atomic Energy,the irradiation experiments for the domestic nuclear grade 304NG stainless steel which is a kind of nuclear reactor internal materials were carried out with different doses and different temperatures.The hardness and elastic modulus of the samples before and after irradiation were measured by nano-indentation with continuous stiffness measurement technique.The results show that under 6 dpa,with the increase of irradiation temperature,the irradiation hardening becomes weakened.Under 300 ℃,the irradiation hardening increases with the irradiation dose.After withstanding higher irradiation dose,the irradiation hardening of hydrogen and helium injected range is more significant,indicating the hydrogen and helium enhance hardening effect.