Evolution of Dislocation Loops in AL-6XN Stainless Steels Irradiated by Hydrogen Ions

doi:10.1007/s40195-016-0490-2

Abstract

Abstract:

AL-6XN stainless steels, one of the candidate structure materials for supercritical water-cooled reactor, were irradiated from 0.5 to 5 dpa using 100 keV H₂⁺ ions at 290 and 380 °C. Microstructures were characterized by transmission electron microscopy (TEM). Dislocation loops were the dominant radiation-induced defects. All the dislocation loops had 1/3 <111> type Burgers vector. Number density and size of the loops have been measured. Nucleation and evolution of dislocation loops were also investigated. Voids were observed only in the condition of 5 dpa at 380 °C. Different evolution mechanisms of the radiation-induced dislocation loops were discussed. Effects of hydrogen and elevated temperature on the microstructural evolution were also investigated. Besides, the formed voids have a further effect on the evolution of dislocation loops.

Key words: Supercritical water-cooled reactor, Austenitic stainless steelsIon irradiation, Dislocation loops, Hydrogen

Zhong-Cheng Zheng,Yan-Xia Yu,Wei-Ping Zhang,Zhen-Yu Shen,Feng-Feng Luo,Li-Ping Guo,Yao-Yao Ren,Rui Tang. Evolution of Dislocation Loops in AL-6XN Stainless Steels Irradiated by Hydrogen Ions[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(1): 89-96.

Figures/Tables 6

Fig. 1 TEM image of microstructure in unirradiated AL-6XN stainless steels

Fig. 2 TEM images of microstructure in AL-6XN irradiated at 290 °C to 0.5 dpa a, 1 dpa b, 3 dpa c, 5 dpa d, taken near <011> zone axis at g = 200 condition; e, f, g, h are the size distribution of the dislocation loops, respectively

Fig. 3 TEM images of dislocation loops in AL-6XN irradiated at 380 °C to 0.5 dpa a, 1 dpa b, 3 dpa c, 5 dpa d, taken near <011> zone axis at g = 200 condition; e, f, g, h are the size distribution of the dislocation loops, respectively

Fig. 4 TEM image of the voids in AL-6XN irradiated at 380 °C to 5 dpa

Fig. 5 Loop density a and mean loop diameter b dependence of irradiation dose

Fig. 6 TEM images of the dislocation loops in specimens irradiated to 3 dpa at 290 °C a, 380 °C b, using g = 200, \(\bar{1}1\bar{1}\) and \(\bar{1}\bar{1}1\) near the <011> zone axis

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