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발전소용 12Cr-Mo-V강의 재현용접 열영향부에 대한 크리프 손상 평가
정용근,강용호,박종진,주철홍,박익민 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.1
The creep rupture tests were carried out on actual welded joint specimens of 12Cr-Mo-V steel. It was revealed that the creep rupture life of actual welded joint was approximately 41% of that of base metal and the creep damage of it occurred mainly at intercritical heat-affected zone(HAZ). On the basis of the heat input during the welding, microstructure, microhardness and grain size of the actual intercritical HAZ, simulated HAZ was made in order to evaluate its material properties. The tensile tests and interrupted creep test were carried out on the simulated HAZ specimens. It was found that the tensile properties of the simulated HAZ were slightly inferior to those of the base metal and the creep rupture strength of it was approximately 46% of that of base metal and the creep strain rate of it was higher than that of base metal. The creep cavities in simulated HAZ were found at an early stage of creep life and the number of creep cavities increased exponentially and the average diameter of cavities increased linearly with creep life fraction. Plasticity constants of simulated HAZ can be available for the analysis of creep crack growth and the number and average diameter of creep cavities can be available for the evaluation of creep damage for welded joint.
정용근,정광교,Jeong, Yong-Geun,Choung, Gyo-Kwang 선박안전기술공단 2008 선박안전 Vol.24 No.-
본 연구는 RFID기술을 활용한 선박안전관리에 대한 것이다. 최근 선박안전법 개정으로 2008년부터 2톤 미만의 선박검사와 수상레저기구의 검사 등 선박의 종류 및 형태가 다양해지고 있어 선박의 등록 및 관리에 많은 어려움이 예상된다. RFID기술은 다양한 산업기술 분야에서 빠르게 활용되고 있으며, 이를 선박안전관리법에 적용하고자 하였다. RFID기술을 선박에 적용할 경우 선박의 도난 및 미수검 선박 방지에도 큰 효과를 얻을 수 있을 것으로 사료된다.