304奥氏体不锈钢离子辐照后超显微硬度和微结构变化

Micro-hardness and Micro-structure Changes of 304 Austenitic Stainless Steel after High Energy Ion Irradiation

对304奥氏体不锈钢进行固溶处理及随后的铁离子和氦离子辐照,并对三种处理试样进行超显微硬度测量和透射电镜下微观组织的观察。结果发现,相同的辐照能量和剂量下,两种离子辐照的硬化效果和微结构有较大的差异。铁离子辐照后试样的较浅层的硬化效果更显著,氦离子辐照后试样的较深层硬化效果更高些;铁离子辐照后试样表层辐照缺陷主要由高密度位错和位错缠结构成,氦离子辐照后表层辐照缺陷主要由细小致密的黑斑构成。

304 austenitic stainless steel was annealed and irradiated by Fe+ or He+ ions. Micro-hardness of three-kind specimens was measured and their micro-structures were observed with transmission electron microscope (TEM). The results showed that the hardening effect and micro-structure of irradiated specimen were different although the energy and dose of Fe+ ions were as same as the energy and dose of He+ ions. The specimen irradiated by Fe+ ions exhibited higher hardness in the place near the surface and specimen irradiated by He+ ions showed higher hardness in deeper surface layer. Dislocation and dislocation tangles could be observed for specimen irradiated by Fe+ ions while very small black dot can be seen for specimen.