【摘要】 用高压电子显微镜(HVEM)研究了被电子辐照的奥氏体不锈钢在400～720℃范围内,温度对其肿胀行为的影响。样品材料包括:固溶退火的316不锈钢(316SA)、冷轧316不锈钢(316CW)和加钛的奥氏体不锈钢(Ti-mod.SS),HVEM的电子能量为1MeV。研究了平均孔洞密度、平均孔洞直径、肿胀、肿胀率同孕育剂量与温度的关系。认为辐照温度影响样品的微结构、总尾闾强度和中性尾闾与偏向性尾闾强度之比,从而使316SA、316CW和Ti-mod.SS的孔洞成核、孔洞长大及肿胀行为有所不同。还研究了氦预植入对孔洞成核的影响,实验结果表明:氦虽成为活跃的孔洞核心,但对孔洞长大并无直接影响。更多还原

【Abstract】 A study of the influence of temperature on swelling behavior in electron irradiated austenitic stainless steels has been performed with a high voltage electron microscope (HVEM) in the temperature range 400 to 720C. The specimen materials were solution annealed (SA) 316 stainless steel (SS), cold worked (CW) 316 SS and Ti-modified austenitic stainless steel (Ti-mod. SS). The electron energy in HVEM was 1 MeV. The results of mean void density, mean void diameter, void swelling, swelling rate and incubation dose vs. dose and temperature are presented. Itis suggested that the irradiation temperature influenced the microstructure, overall sink strength and relative strength of neutral sinks to that of biased sinks in the specimens and so made the void nucleation, void growth and swelling behavior differently in 316 SA, 316 CW and Ti-mod. SS. The influence of He pre-implanta-tion on void nucleation in electron irradiated austenitic stainless steels has also been studied. The experiments indicated that the helium was primly active void nucleus but had no direct impact on void growth.更多还原