Effect of radiation temperature on second defects and swelling in SUS316L stainless steel
YANG Zhan-bing1, YANG Su-bing1,2, LI Lian-qi1
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Graduate School of Engineering, Hokkaido University, Hokkaido 060-8628, Sapporo, Japan
Abstract：The high voltage electron microscope was employed to perform electron beam irradiations on SUS316L austenitic stainless steel with a dose of 3.6 dpa at 350, 400, 450 and 500 ℃. The effect of the electron beam radiation on the swelling rate of material at different temperatures was discussed by observing and analyzing the number density of void, the dislocation loop and the swelling rate in the sample after irradiation. The result showed that the second defects such as dislocation loops and voids, occur in the samples at different temperatures. The radiation swelling was caused by voids. And the swelling increased with the increase of temperature in the region of 350-450 ℃, and reached the maximum at 450 ℃. Above 450 ℃, the swelling rate decreased. Under different temperatures, the two kinds of secondary defects had different sink strength to the point defects, and the swelling rate was related to the proportion of dislocation loops and voids in the microstructure. The experimental study on the relationship between the irradiation swelling rate and secondary defects provided the basis for further understanding the mechanism of radiation swelling and seeking the method of restraining irradiation swelling.
杨占兵, 杨苏冰, 李连奇. 辐照温度对SUS316L不锈钢中二次缺陷及肿胀的影响[J]. 中国冶金, 2020, 30(3): 35-39.
YANG Zhan-bing, YANG Su-bing, LI Lian-qi. Effect of radiation temperature on second defects and swelling in SUS316L stainless steel[J]. China Metallurgy, 2020, 30(3): 35-39.
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2020, Vol. 30 
