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The Strength and Fracture Behavior characteristics of Irradiated Zr-2.5Nb CANDU Pressure Tube Materials
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 Title & Authors
The Strength and Fracture Behavior characteristics of Irradiated Zr-2.5Nb CANDU Pressure Tube Materials
An, Sang-Bok; Kim, Yeong-Seok; Kim, Jeong-Gyu;
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The tensile and fracture toughness tests have been conducted to investigate the degradations of mechanical properties induced mainly by neutron irradiations in Zr-2.5Nb CANDU pressure tube materials operated in Wolsung Unit-1. the tests were performed at room, 150, 200, 250, 300 for the irradiated and unirradiated specimens in hot cell. The specimens were directly machined from the tube retaining original curvature using specially designed electric discharge machine(EDM). From the tensile tests of the irradiated specimens, it was found that tensile strength was increased and total elongation was decreased compared to those of the unirradiated ones. The active voltages in the fracture toughness tests for the irradiated showed the discontinuous abrupt increases caused by crack jumping in lower temperature. In the crack resistance curves we found the stable crack growth in the unirradiated, whereas the unstable and three crack growth stages in the irradiated specimens due to the accumulated irradiation defects. The various fracture characteristic values in the irradiated are remarkably lower than those of the unirradiated. Through the fractography, we found in the irradiated that smaller dimple and shorter fissures than the unirradiated, and that the fractured surface had three regions that were flat, transition and slant/shear area. These can explain the difference in the crack growth characteristic values of the irradiated and the unirradiated ones.
Hot Cell;Irradiation;Unirradiation;Neutron;Pressure Tube;Irradiation Defect;Curved Compact Tension;J-R Curve;Fissure;Transition Zone;
 Cited by
수소화물에 의한 Zr-2.5Nb 압력관의 상온 수소취화 거동,오동준;부명환;김영석;

대한기계학회논문집A, 2003. vol.27. 3, pp.455-463 crossref(new window)
Zircaloy-4 핵연료 피복관의 신파괴인성 시험법,오동준;안상복;홍권표;

대한기계학회논문집A, 2003. vol.27. 5, pp.823-832 crossref(new window)
제하 컴플라이언스법 및 직류전위차법을 이용한 Zr-2.5Nb 압력관 휘어진 CT 시편의 균열시작 평가,정현철;안상복;김영석;

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