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Fe-28at.%Al 합금의 미세조직과 기계적 성질에 미치는 Cr , Mo 및 B 의 영향
최답천,이연오,김관휴,박은식,이호종 ( Dap Chun Choi,Yeon O Lee,Kwan Hyu Kim,Eun Sik Park,Ho Jong Lee ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.5
N/A The effects of Cr, Mo or B additions were investigated on B2↔DO₃structural transition temperature (T_c) and mechanical properties of Fe-28at.%Al. The raw materials were arc-melted in vacuum and then subjected to the following heat-treatments to maximize the DO₃ordered structure : 1000℃/7days, slowly cooled to 500℃ and then held for 5 days. In the effect on the grain refinment, the addition of alloying element B was the most effective. The addition of Cr or Mo had little effect. When 1at.%Mo was added, T_c increase about 30℃, but Cr had a very little effect on T_c. On the contrary, when B was added, T_c was apt to come down minutely. In the additional effect of alloying element on the mechanical properties, Cr was apt to decrease the microvickers hardness and yield strength, Mo and B didn`t have much effect. In the case of compressure strength test, the effect of the environment on the yield strength was contrary to the result of the tensile strength test.
용탕단조법에 의한 금속간화합물 / Al 기지 복합재료 개발을 위한 기초연구
최답천,이경구,이연오 ( Dap Chun Choi,Kyung Ku Lee,Yeon O Lee ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.5
N/A The microvickers hardness and microstructure of Fe/Al composite fabricated by squeeze casting method were investigated. Pure Al and A356 Alloy were chosen for the matrix composition and Fe preform was fabricated with sintered Fe powder at 1000℃ for 30min. under hydrogen atmosphere. Experimental variables were included preheating temperature, melt temperature and applied pressure. Analysing the experimental result concerning microstructure of fabricated composites, Fe/A356 composite showed improved microstructure at 600℃ melt temperature and 350℃ preform preheating temperature in Fe distribution and Infiltrated distance. The results of EDX and XRD showed that the interfacial zones of Fe/Al composite were composed of non-equilibrium intermetallic layers[(Al_5Fe₂)_x, Al_(13)Fe₄m Fe₃Al, FeAl]. The microvickers hardness of Fe/Al composite showed higher value than Fe/A356 composite in interface.
사용후핵연료 다목적 캐니스터의 운반 및 저장 보조 설비에 대한 예비설계 평가
신창민,이상환,이연오,정인수,차길용 (사)한국방사선산업학회 2023 방사선산업학회지 Vol.17 No.3
A multi-purpose canister (MPC) was developed for the purpose of transportation, storageand disposal of spent nuclear fuel (SNF) and has the advantage of minimizing repackaging betweenmanagement stages of SNF. Considering the typical rock characteristics in Korea, a disposal canisteris expected to contain 4 assemblies of Pressurized water reactor (PWR) SNF. The capacity of the MPCshould be similarly designed with the disposal canister. However, the MPC with four SNF assemblies isexpected to be less efficient in transporting and storing compared to a large-capacity canister. Therefore,a preliminary concept was derived for an auxiliary equipment that can transport and store multiple MPCsin a large overpack. A previously derived concept from US was thoroughly reviewed, and the preliminaryconcept was revised considering domestic situations including crane capacity and others. In addition,the safety of the normal transportation and storage of the MPC placed in transportation and storageoverpack was evaluated with the auxiliary equipment.