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利用激光-超高压电子显微镜系统在500℃对SUS316L奥氏体不锈钢进行了电子束辐照和脉冲激光-电子束双束同时辐照(以下简称:同时辐照),通过观察和分析辐照后自由晶界处无空洞区域以及元素偏析,以电子束辐照结果为标准,对比研究了同时辐照对空位扩散的影响.结果表明:同时辐照后的无空洞区域宽度为48±16 nm,小于电子辐照的71±27 nm;不论在偏析程度还是偏析宽度上,同时辐照条件下Cr和Ni的偏析都小于对应的电子束辐照;同时辐照下空位的扩散通量仅为电子束辐照的45.7%.通过分析得出,和电子辐照相比,同时辐照促进了空位与间隙原子的再结合,限制空位向尾闾扩散,进而造成流入尾闾的空位数量减少,极大地抑制了辐照偏析与肿胀.脉冲激光-电子束双束同时辐照可以为探索抑制肿胀方法提供新的思路.
The microstructure of SUS316L austenitic stainless steel was studied by laser-EHV electron microscope at 500 ℃. Electron beam irradiation and pulsed laser-electron beam double beam simultaneous irradiation (hereinafter referred to as simultaneous irradiation) The free grain boundaries at the free grain boundary and the element segregation are compared with the results of electron beam irradiation as a standard to compare the effects of simultaneous irradiation on the vacancy diffusion.The results show that the width of the void-free region after simultaneous irradiation is 48 ± 16 nm, Less than the electron irradiation of 71 ± 27 nm; both segregation degree and segregation width, under the same irradiation conditions Cr and Ni segregation is smaller than the corresponding electron beam irradiation; while under the irradiation of the vacancy diffusion flux is only electron 45.7% of the irradiance.According to the analysis, the simultaneous irradiation promoted the recombination of vacancies and interstitial atoms and restricted the diffusion of vacancies to the tail, which resulted in the decrease of the number of vacancies flowing into the tail, The earth restrains the radiation segregation and the swelling. The simultaneous irradiation of pulsed laser and electron beam can provide a new way to explore the method of inhibiting the swelling.