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《Chinese Journal of Engineering》 2017-06
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Effect of pulsed-laser and/or electron irradiation on vacancy diffusion in SUS316L austenitic stainless steel

YANG Su-bing;YANG Zhan-bing;WANG Hui;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing;  
Electron irradiation and simultaneous pulsed-laser and electron dual-beam irradiation were performed using laser high voltage electronic microscopy(HVEM) at 500 ℃,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 irradiation 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 dualbeam irradiation.This has the effect of suppressing RIS and void swelling.Therefore,simultaneous pulsed-laser and electron dualbeam irradiation is expected to provide new insights into the suppression of void swelling.
【Fund】: 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
【CateGory Index】: TG142.71
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