国产改进型316L不锈钢的微结构研究  

Microstructure Study on Home-made Modified 316L Stainless Steels

作　　者：普拉提.艾合买提 范志国[1] 罗起[1] 徐勇军[1] 朱佳政[1] 郑永男[1] 周冬梅[1] 朱升云[1] 

机构地区：[1]中国原子能科学研究院核物理研究所,北京102413

出　　处：《原子能科学技术》2003年第1期18-21,共4页Atomic Energy Science and Technology

基　　金：国家重点基础研究发展规划资助项目(G1999022600);国家自然科学基金资助项目(19835050)

摘　　要：采用正电子湮没寿命方法研究了国产改进型316L不锈钢的微结构及其温度变化。该不锈钢含有单空位、双空位、位错和小空位团等缺陷。经400、600、800℃退火后,单空位、双空位和位错缺陷分别消失。小空位团是由四空位和五空位构成的空位团。低于200℃退火时,缺陷复合五空位团成分随退火温度升高而增大;高于400℃时,空位团分裂,五空位团成分减少;800℃退火仍存在较低浓度的四空位团。Microstructure of homemade modified 316L stainless steels and its thermal annealing behavior are studied by the positron annihilation lifetime technique. There exist monovacancies, divacancies, dislocations and small vacancy clusters in them. The monovacancies, divacancies and dislocations are annealed away at 400, 600 and 800 ℃, respectively. The observed vacancy clusters are quadrivacancies and pentavacancies. The relative intensity of pentavacancies increases with the increasing of annealing temperature below 200 ℃, dissociation takes place and the relative intensity of pentavacancies decreases above 400 ℃, and up to 800 ℃ quadrivacancies still remain with a low concentration.

关 键 词：316L不锈钢 微结构 缺陷 正电子湮没寿命 加速器 材料 抗辐射性能 

分 类 号：TL5[核科学技术—核技术及应用] O571.33[理学—粒子物理与原子核物理]