Papers by Author: Eun Joo Shin

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Authors: Young Soo Han, Eun Joo Shin, Baek Seok Seong, Chang Hee Lee, Duck Gun Park
Abstract: The irradiation induced defects of irradiated reactor pressure vessel(RPV) steel were investigated by a small angle neutron scattering. The degradation of the mechanical properties of RPV steels during an irradiation in a nuclear power plant is closely related to the irradiation induced defects. The size of these defects is known to be a few nanometers, and the small angle neutron scattering technique is regarded as the best non destructive technique to characterize the nano sized inhomogeneities in bulk samples. The RPV steel was irradiated in the HANARO reactor in KAERI. The small angle neutron scattering experiments were performed at SANS instrument in the HANARO reactor. Both unirradiated and irradiated RPV steels were measured and the SANS data of both steels were compared. The nano sized irradiation induced defects were quantitatively analyzed by SANS. The type of defects was also analyzed based on the SANS results, and the effect of the chemical composition of the RPV steel on the irradiation induced defects was discussed.
Authors: Eun Joo Shin, Baek Seok Seong, Tae Won Joung, Kwang Pyo Hong, Chang Hee Lee, Young Jin Kim
Authors: Baek Seok Seong, Jae Young Choi, Eun Joo Shin, Young Soo Han, Kwang Pyo Hong, Chang Hee Lee, Hak Rho Kim, Hu Chul Lee
Authors: Tae Ho Lee, Eun Joo Shin, Heon Young Ha, Chang Seok Oh, Sung Joon Kim
Abstract: Deformation microstructure of Fe-18Cr-10Mn alloys with different nitrogen content (0.39 and 0.69N) were investigated using neutron diffraction. The deformation mode changed from strain-induced martensitic transformation (SIMT) to deformation twinning (DT), as nitrogen content was increased. The measured neutron profiles of tensile-strained bulk samples were fitted by modified Thomson-Cox-Hasting profile-shape function and the Lorentzian and Gaussian integral breadths were calculated based on Rietveld refinement. With the calculated integral breadths, the mean-squared (MS) strain could be evaluated using the size and strain analysis of double-Voigt approach. Based on the analysis of peak shift of individual reflections, the stacking fault probability (SFP) was determined. Although the calculated SFP and MS strain varied with the degree of deformation, the ratio of MS strain to SFP remained constant for each alloys regardless of tensile strain, but increased with nitrogen content. As a result, it was found that the SFE increased with increasing nitrogen content. The nitrogen-induced transition of deformation microstructure was accounted for by the change in SFE, as reported in other fcc materials.
Authors: Jin Ho Bae, Gyun Heo, Seung Taik Oh, Eun Joo Shin, Baek Seok Seong, Chang Hee Lee, Kyu Hwan Oh
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