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| 1 | Laser dissimilar welding of CoCrFeMnNi-high entropy alloy and duplex stainless steel显示文摘High entropy alloys(HEAs)have superior mechanical properties that have enabled them to be used as structural materials in nuclear and aerospace applications.As a dissimilar joint design is required for these applications,we created a dissimilar joint between CoCrFeMnNi-HEA and duplex stainless steel(DSS)through laser beam welding;a technique capable of producing a sound joint between the two materials.Micro structure examination using SEM/EBSD/XRD analysis revealed that the weld metal(WM)exhibits an FCC phase regardless of the postweld heat treatment(PWHT)temperature(800 and 1000℃)without forming detrimental intermetallic compounds or microsegregation.The heat-affected zone of the CoCrFeMnNi-HEA showed CrMn oxide inclusions while that of the DSS showed no inclusions.Moreover,a lower hardness was recorded by the WM compared to the base metal after welding.After PWHT,the hardness of the WM,CoCrFeMnNi-HEA,and DSS decreased with an increase in the PWHT temperature.However,the decrease in the hardness of the HEA was more significant than in the WM and DSS.The cause for this reduction in hardness was attributed to recrystallization and grain growth.In addition,a strength of 584 MPa with low ductility was recorded after welding.The obtained strength was lower than that of the BMs,but comparable to that of the welded CoCrFeMnNi-HEA.The application of PWHT resulted in over a 20%increment in ductility,with only a marginal reduction in strength.The defo rmation mechanism in the as-weld joint was mainly dominated by dislocation while that for the PWHT joint was twinning.We propose laser beam offset welding as a technique to improve the mechanical properties of the dissimilar joint,which will be the subject of future studies. | Nana Kwabena Adomako Giseung Shin Nokeun Park Kyoungtae Park Jeoung Han Kim | 2021 | Journal of Materials Science & Technology2021，，26： | 6 |
| 2 | The analysis of self-employment levels over the life-cycle 显示文摘 | GiSeung Kim | 2007 | The Quarterly Review of Economics and Finance2007，，47： | 1 |
| 3 | Employment Problems with Irregular Workers in Korea: A Critical Approach to Government Policy显示文摘 | Cho Joonmo Kim GiSeung Kwon Taehee | 2008 | Pacific Affairs2008，，3： | 1 |
| 4 | The analysis of self-employment levels over the life- cycle 显示文摘 | Kim GiSeung | 2007 | The Quarterly Review of Economics and Finance2007，47，3： | 1 |
| 5 | CO_(2)-adsorbent spongy electrode for non-aqueous Li–O_(2) batteries显示文摘Regulation of the Li_(2)CO_(3) byproduct is the most critical challenge in the field of non-aqueous Li–O_(2) batteries.Although considerable efforts have been devoted to preventing Li_(2)CO_(3) formation,no approaches have suggested the ultimate solution of utilizing the clean Li_(2)O_(2) reaction instead of that of Li_(2)CO_(3).Even if extremely pure O_(2) is used in a Li–O_(2) cell,its complete elimination is impossible,eventually generating CO_(2) gas during charge.In this paper,we present the new concept of a CO_(2)-adsorbent spongy electrode(CASE),which is designed to trap the evolved CO_(2) using adsorption materials.Various candidates composed of amine functional groups(–NH2)for capturing CO_(2) were screened,with quadrapurebenzylamine(QPBZA)exhibiting superior CO_(2)-adsorbing ability among the proposed candidates.Accordingly,we fabricated the CASE by sandwiching QPBZA between porous carbon layers,which facilitated the transport of gaseous products.The new electrode was demonstrated to effectively capture the evolved CO_(2) during charge,therefore altering the reaction pathways to the ideal case.It is highly advantageous to mitigate the undesirable CO_(2) incorporation in the next discharge,resulting in improved cyclability.This novel concept of a CO_(2)-sponging electrode provides an alternative route to the realization of practically meaningful Li–O_(2) batteries. | Yiseul Yoo Giseung Lee Min-Gi Jeong Hun-Gi Jung Sunghee Shin Dongjin Byun Taeeun Yim Hee-Dae Lim | 2022 | Journal of Energy Chemistry2022，31，2： | 0 |
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