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저방사화 페라이트강(RAFs)의 파괴인성 및 피로균열진전 특성
김동현(Dong-Hyun Kim),윤한기(Han-Ki Yoon),김사웅(Sa-Wong Kim),A. Kohyama 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The objective of this study is to investigate fracture toughness and fatigue crack propagation behavior in the Reduced Activation Ferritic Steel (RAFs) JLF-1. The fracture toughness tests were performed with various size(plane size and thickness) and various side groove of specimens. The fatigue crack propagation behavior of the JLF-1 steel was investigated by the constant-amplitude loading test for the stress ratios R =0.1, 0.3 and 0.5 respectively. The effects of stress ratios and specimen size on the fatigue crack growth behaviors for JLF-1 steel were discussed within the Paris law. The test results showed the standard CT specimen with the side groove of 40 % represented a valid fracture toughness. The fracture resistance curve increased with increasing plane size and decreased with increasing thickness. However, the fracture resistance curve of half size specimen was similar to that of the standard specimen. The fatigue crack propagation rate of a half size specimen was similar to that of a full size specimen at the stress ratios of 0.1, 0.3 and 0.5 respectively. The fatigue crack propagation behavior of this material were evaluated by using a half size specimen.
AE기법 이용한 JLF/STS304이종재료의 최적 마찰용접조건에 관한 연구
윤한기,이진경,이상필,공유식 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.2
저방사화 페라이트강인 JLF는 핵융합로의 블랑켓과 같은 열교환기의 재료로써 유용한 재료이다. 이 재료의 광범위한 적용을 위해서는 JLF강과 다른 재료와의 접합기술의 개발이 중요하다. 최근 두 이종재료간의 접합에는 마찰용접이 많이 이용되고 있으며 본 연구에서도 JLF강과 STS304 간의 마찰용접에 의한 용접특성을 평가하였으며 특히 비파괴기법중의 하나인 음향방출 기법을 이용하여 두 이종재료간의 용접특성 및 최적의 용접조건을 평가하였다. 음향방출 파라미터중의 하나인 카운트와 사상수 등이 최적용접조건 및 용접품질을 평가하는데 유효한 파라미터들이었다. Japanese low activation ferritic steel(JLF) is a good material for the parts of heat exchanger such as blanket and diverter. At first, JLF was developed as a candidate for structural materials in nuclear fusion applications. However, the development of the jointing technique of JLF steel to other materials is important for wide applications of this material to the industry fields. Recently the jointing technologies including diffusion bonding, brazing, roll bonding, explosive bonding and hot iso-static pressing have been studied for the heterogeneous materials of JLF-1 steel(Fe-9Cr-2W-V-Ta) and stainless steel(STS304). Friction welding is one of the most popular welding methods for two different kinds of materials. In this paper, the JLF-1 steel was jointed to STS304 by friction welding method and the optimal conditions of the friction welding discussed. Acoustic emission was used as a nondestructive technique to evaluate the weld quality in processing.
저방사화강(JLF-1)의 고온 피로균열진전거동에 관한 연구
박원조,정재욱,허선철,허정원 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-
The objective of this study is to investigate life and fatigue crack propagation in the Reduced Activation Ferritic steel(RAFs) JLF-1. Crack growth rate tests on compact tension specimen of thickness 12mm were conducted by using sinusoidal waveform. Compact tension specimens were used and crack growth rate da/dN and stress intensity factor range ΔK were analyzed concerning to the R value of 0.1, 0.3 and 0.5 In order to find out the value of ΔK, load amplitude constant method was applied by the standard fatigue testing method describes in ASTM E647-95a. The effects of stress ratio and specimen size on the fatigue crack growth propagation for JLF-1 steel were discussed within the Paris law. As the result of this study, fatigue crack growth rate increased with in creasing the load ratio, Consequently, fatigue crack propagation of half size specimen was similar to those of full size specimen at room temperature. Also, there was no difference between base metal and weld metal at room temperature and high temperature.(400℃)
핵융합로용 저방사화 철강재료(JLF-1)의 강도와 파괴인성 K<SUB>IC</SUB> 평가
김동현(D. H. Kim),윤한기(H. K. Yoon),이상필(S. P. Lee),공유식(Y. S. Kong),A. Kohyama 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
A reduced activation ferritic steel (JLF-1) has been developed for a candidate of structural materials in nuclear fusion reactor applications. The tensile properties and fracture toughness (K<SUB>IC</SUB>) of the JLF-1 steel were evaluated from the variation of temperature and rolling direction. From experimental results, it was found that the tensile properties and fracture toughness of JLF-1 steel showed the isotropy in the rolling direction. However, The result of test at room temperature showed higher strength and fracture toughness than test at high temperature(400℃).
최종수(Jong-Su Choi) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.3
JLF-1 steel (Fe-9Cr-2W-V-Ta), low activation ferritic steel is one of the promising candidate materials for fusion reactor applications. High temperature fatigue life and tensile strength of JLF-1 steel and its TIG welded joints were investigated at the room temperature and 400℃. The strength of base metal (JLF-1) is in between those of weld metal and the HAZ. When the test temperature was increased from room temperature to 400℃ both strength and ductility decreased for base metal, weld metal and the HAZ. The longitudinal specimens of base metal showed similar strength and ductility compared with those of the transverse specimens at room temperature and 400℃. Little anisotropy was observed in the JLF-1 steel base metal in terms of rolling direction. Fatigue limit of weld metal which was obtained from cross-weld specimen is 495MPa. Thus, the weld metal showed the higher fatigue limit than those of base metal at both room temperature and 400℃. Little anisotropy of fatigue properties was observed for JLF-1 base metal in terms of rolling direction. When the test temperature was increased from room temperature to 400℃, the fatigue limit of both base metal and weld metal decreased substantially.
윤한기(Hanki Yoon),조승연(Seongyeon Cho),정용환(Yonghan Jeong) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.2
Testing blanket concept in the integrated fusion environment is one of the principal objective of ITER. Blanket test modules will be intended in ITER from its operation and will be provide the first experimented data on the feasibility of the D-T cycle for fusion. In the Dual Coolant Lead Lithium(DCLL) blanket, the key element is the Flow Channel Insert(FCI) made of a silicon carbide and composite(SiCf/SiC), which serves as electric and thermal insulator. Therefore, the idea of using FCI as both electric and thermal insulator takes center place in ITER blanket concept, with Pb-17Li as a breeder and SiC ceramic and ferrite steel as a structural material. In this specials session, the trend of the design concept and R&D of fusion blanket material are introduced.