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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℃).
핵융합로용 저 방사화 페라이트강(JLF-1)의 피로균열진전 거동
윤한기(H.K. Yoon),이상필(S.P. Lee),공유식(Y.S. Kong),김사웅(S.W. Kim),박원조(W.J. Park),A.Kohyama(A. Kohyama) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The objective of this study is to investigate fatigue life and fatigue crack propagation behavior in the Reduced Activation Ferritic Steel (RAFs) JLF-I. The experiment of fatigue life for JLF-I steel have been carried out for the stress ratio R=0 at room temperature. The fatigue crack propagation behavior of the JLF-I 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-I steel were discussed within the Paris law. At room temperature, the fatigue limits of longitudinal and transverse direction to the rolling direction were 470 MPa and 490 MPa at 1X 10_7<br/> cycles. respectively. The base material of JLF-I steel showed the isotropic behavior in fatigue properties of the rolling direction and the test temperature. 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 was evaluated by using a half size specimen.
핵융합로용 저방사화 철강재료(JLF-1)의 강도와 파괴인성
윤한기(H.K.Yoon),김동현(D.H.Kim),이상필(S.P.Lee),박이현(Y.H.Park),공유식(Y.S.Kong),Y.Katoh,A.Kohyama 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Reduced activation ferritic steel, JLF-1 steel (Fe-9Cr-2W-V-Ta), is one of the promising candidate<br/> materials for fusion reactor applications. Fracture toughness (JIC) and tensile tests were carried out at<br/> room temperature and elevated temperature (400 ℃). Two types of CT specimen were prepared to<br/> examine the effect of rolling direction on the fracture toughness of JLF-1 steel. Four types of tensile<br/> specimen were also prepared to investigate the property by the rolling direction and welding. The<br/> Micro Vickers hardness was measured at various distances of a cross section of the TIG joints of<br/> JLF-1 steel according to the heating history of each position. Finally, the fracture surface was observed<br/> by scanning electron microscopy (SEM).
저방사화 철강재 의 시험편 크기 변화에 따른 (JLF-1) 파괴저항곡선의 변화
김동현(D.H.Kim),윤한기(H.K.Yoon),이상필(S.P.Lee),A.Kohyama 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Reduced activation ferritic steel (JLF-1) is considered as a promising candidate material for blanket<br/> or first-wall structure of D-T fusion reactors. The fracture tests of fracture resistance curve (J-R curve)<br/> and JIC are desirable to investigate the exact fracture toughness of JLF-1 steel, since it has a high<br/> ductility. The fracture toughness of JLF-1 steel is affected by the configuration of test specimen such<br/> side groove, specimen thickness or specimen size. In this study, the fracture toughness tests were<br/> performed with various size(plane size and thickness) and various side groove of specimens. The test<br/> results showed the standard specimen with the side groove of 40 % represented a valid fracture<br/> toughness. The fracture resistance curve increased with increasing plane size and decreased with<br/> increasing thickness. However, the fracture resistance curve of half size specimen was similar to that of<br/> the standard specimen.