工程科学学报，第39卷.第6期：903-908.2017年6月 Chinese Journal of Engineering,Vol.39,No.6:903-908,June 2017 DOI:10.13374/j.issn2095-9389.2017.06.013;http://journals.ustb.edu.cn 脉冲激光亦或电子束辐照对SUS316L奥氏体不锈钢 中空位扩散的影响 杨苏冰12)，杨占兵12)四，王会12) 1)北京科技大学治金与生态工程学院，北京1000832)北京科技大学钢铁冶金新技术国家重点实验室，北京100083 区通信作者，E-mail:yangzhanbing(@usth.cd.cm 摘要利用激光-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±16m,小于电子辐照的71±27nm;不论 在偏析程度还是偏析宽度上，同时辐照条件下C和N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.脉冲激光一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 关键词奥氏体不锈钢：脉冲激光-电子束双束同时辐照：过饱和空位：无空洞区域：辐照偏析：辐照肿胀 分类号T341 Effect of pulsed-laser and/or electron irradiation on vacancy diffusion in SUS316L austenitic stainless steel YANG Su-bing'),YANG Zhan-bing 2),WANG Hui) 1)School of Metallurgical and Ecological Engineering,University of Seience and Technology Beijing,Beijing 100083,China 2)State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China XCorresponding author,E-mail:yangzhanbing@ustb.edu.en ABSTRACT Electron irradiation and simultaneous pulsed-laser and electron dual-beam irradiation were performed using laser high voltage electronic microscopy (HVEM)at 500C,and the void-denuded zone (VDZ)and radiation-induced segregation (RIS)near the random grain boundary were observed and analyzed after irradiation.Compared to electron irradiation,the effect of simultaneous pulsed-laser and electron dual-beam irradiation on vacancy diffusion was investigated.The results show that the width of VDZ after simultaneous pulsed-laser and electron dual-beam irradiation is 48+16 nm which is smaller than the VDZ width of 71+27 nm after electron irradiation.Both the magnitude and width of Cr and Ni segregation under simultaneous pulsed-laser and electron dual-beam ir- radiation are lower than those under electron irradiation.The ratio of vacancy flux of simultaneous pulsed-laser and electron dual-beam irradiation to that of electron irradiation is 45.7%.Compared to electron irradiation,the vacancy flux flowing into point defect sinks is lower owing to enhanced recombination between vacancies and interstitial spaces under simultaneous pulsed-laser and electron dual- beam irradiation.This has the effect of suppressing RIS and void swelling.Therefore,simultaneous pulsed-laser and electron dual- beam irradiation is expected to provide new insights into the suppression of void swelling. KEY WORDS austenitic stainless steel;simultaneous pulsed-laser and electron dual-beam irradiation;excess vacancies;void de- 收稿日期：2016-09-23 基金项目：国家自然科学基金资助项目(51471027)：2014年钢铁冶金新技术国家重点实验室开放基金资助项目(KF14-03):中央高校基本科 研业务费工程科学学报,第 39 卷,第 6 期:903鄄鄄908,2017 年 6 月 Chinese Journal of Engineering, Vol. 39, No. 6: 903鄄鄄908, June 2017 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2017. 06. 013; http: / / journals. ustb. edu. cn 脉冲激光亦或电子束辐照对 SUS316L 奥氏体不锈钢 中空位扩散的影响 杨苏冰1,2) , 杨占兵1,2) 苣 , 王 会1,2) 1) 北京科技大学冶金与生态工程学院, 北京 100083 2) 北京科技大学钢铁冶金新技术国家重点实验室, 北京 100083 苣通信作者, E鄄mail: yangzhanbing@ ustb. edu. cn 收稿日期: 2016鄄鄄09鄄鄄23 基金项目: 国家自然科学基金资助项目(51471027);2014 年钢铁冶金新技术国家重点实验室开放基金资助项目(KF14鄄鄄03);中央高校基本科 研业务费 摘 要 利用激光鄄鄄超高压电子显微镜系统在 500 益对 SUS316L 奥氏体不锈钢进行了电子束辐照和脉冲激光鄄鄄电子束双束同 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 依 16 nm,小于电子辐照的71 依 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郾 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. 脉冲激光鄄鄄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. 关键词 奥氏体不锈钢; 脉冲激光鄄鄄电子束双束同时辐照; 过饱和空位; 无空洞区域; 辐照偏析; 辐照肿胀 分类号 TL341 Effect of pulsed鄄laser and / or electron irradiation on vacancy diffusion in SUS316L austenitic stainless steel YANG Su鄄bing 1,2) , YANG Zhan鄄bing 1,2) 苣 , WANG Hui 1,2) 1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China 苣Corresponding author, E鄄mail: yangzhanbing@ ustb. edu. cn ABSTRACT Electron irradiation and simultaneous pulsed鄄laser and electron dual鄄beam irradiation were performed using laser high voltage electronic microscopy (HVEM) at 500 益 , and the void鄄denuded zone (VDZ) and radiation鄄induced segregation (RIS) near the random grain boundary were observed and analyzed after irradiation. Compared to electron irradiation, the effect of simultaneous pulsed鄄laser and electron dual鄄beam irradiation on vacancy diffusion was investigated. The results show that the width of VDZ after simultaneous pulsed鄄laser and electron dual鄄beam irradiation is 48 依 16 nm which is smaller than the VDZ width of 71 依 27 nm after electron irradiation. Both the magnitude and width of Cr and Ni segregation under simultaneous pulsed鄄laser and electron dual鄄beam ir鄄 radiation are lower than those under electron irradiation. The ratio of vacancy flux of simultaneous pulsed鄄laser and electron dual鄄beam irradiation to that of electron irradiation is 45郾 7% . Compared to electron irradiation, the vacancy flux flowing into point defect sinks is lower owing to enhanced recombination between vacancies and interstitial spaces under simultaneous pulsed鄄laser and electron dual鄄 beam irradiation. This has the effect of suppressing RIS and void swelling. Therefore, simultaneous pulsed鄄laser and electron dual鄄 beam irradiation is expected to provide new insights into the suppression of void swelling. KEY WORDS austenitic stainless steel; simultaneous pulsed鄄laser and electron dual鄄beam irradiation; excess vacancies; void de鄄