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Số người truy cập: 107,157,409

 Ion-irradiation Effects on Hardness and Microstructures in RPV Model Alloys with Higher Mn-Ni-Si Concentrations
Tác giả hoặc Nhóm tác giả: Chen Xinrun, Nguyen Ba Vu Chinh, et al.
Nơi đăng: The Nuclear Material Conference; Số: 2022;Từ->đến trang: 5;Năm: 2022
Lĩnh vực: Khoa học công nghệ; Loại: Báo cáo; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
Embrittlement and hardening of reactor pressure vessel (RPV) steels could be caused by radiation-enhanced nano-scale clusters of solute Ni,Mn and Si generally called Mn-Ni-Si (MNS) clusters. Although the G phase (Mn6Ni17Si7) was identified as one candidate of these cluster, the detail information of evolution process is insufficient because of the small size of the clusters. To investigate the details of mechanism of Mn-Ni-Si clusters evolution in ferric steels, Fe-4.6wt.%Ni- 1.7wt.% Mn-0.7wt.%Si (named hereafter S1 ) and Fe-9.52wt.%Ni-3.91wt.%Mn-1.87wt.%Si (named hereafter S2 ) alloys were fabricated using vacuum induced melting(VIM) under Ar gas atmosphere. The proportion of each element of Mn, Ni and Si was set similar to the stoichiometric proportion of G phase and the concentration ratio of them was set significantly higher than which is in the real RPV steels to easily form this type of clusters in steels. Specimens were annealed at 873K for 30mins and water quenched for well dissolution of all solutes in Fe matrix. Solute concentration and structure of specimens were observed by SEM-EDS and XRD, respectively. Specimens were electrochemically polished after mechanical polishing, and then irradiated by 2.8 MeV Fe ion irradiation at 573±2K in the dosage of 0.3 and 0.9 dpa at the dosage ate of 10-4 dpa/s. Nanoindentation (Shimadzu, DUH-211S) was used to load and unload the Berkovich indenter at 1.4 mN/s, under the maximum penetration depth was set as 200nm to measure the hardness of specimens before and after irradiation. Atom probe tomography(APT) technique and transmission electron microscopy (TEM) were utilized to obtain the 3 dimensional information of clusters and information of defects, respectively. In addition, data from APT was analysis by software IVAS 3.8.0. Irradiation induced hardness increasing of 1.6, 2.8 GPa and 2.3, 2.7 GPa were observed in the dosage of 0.3dpa and 0.9dpa of these two alloys, respectively. There are no large secondary phases precipitates (below 10nm) observed by instant TEM. Heterogeneity of MNS distribution, that looks like a decomposition and/or columned precipitates were observed inside of the S1 specimens in the dosage of 0.9dpa by APT.
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