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LNG 탱크에 사용되는 9% Ni 강의 저온 피로균열진전특성
심규택(Shim kyue taek),김재훈(Kim jae hoon),김영균(Kim young kyun),안병욱(Ahn byoung wook) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The fatigue crack growth behavior of the 9% Ni steel developed for inner shell material of LNG gas tank was examined experimentally at RT and -162℃. These materials are treated by the method of quenching, lamellarizing and tempering(QLT) heat treatment. Newly developed heavy thick plates of 9% Ni steel for large capacity of LNG tank were fabricated to conduct a fatigue crack growth test. Also the weld metal specimens were prepared by taking the same weld procedure applied in actual LNG storage tank inner shell. This study has been carried out to study the influence of temperature and weld effect on fatigue crack growth behavior. It has been confirmed that a little negligible effect of low temperature and welding were found on the fatigue crack growth rates. Also scanning electron microscope (SEM) was used to observe the striation of the fractured surface after fatigue crack tests. After fatigue crack growth tests, CT specimens of 9% Ni steel were evaluated by a ultrasonic test method.
Ag계/Ni계 용가재를 이용한 STS 304L과 Inconel 600의 브레이징에 관한 연구
심규택(Kyue-Taek Shim),주기남(Kee-Nam Choo),조만순(Man-Soon Cho),박승재(Sung-Jae Park),김재훈(Jae-Hoon Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This study was carried out to develop the joining technology by nicro-brazing of STS 304L tube and the thermocouple of Inconel 600 sheath, which is used as an instrument for high-temperature irradiation in HANARO. BAg-1 and BNi-7 were used as filler materials, and AMCO 446 was selected as flux in the brazing. For evaluation of solidity of the joining, the tensile strength and the micro hardness were measured. Both the brazings of STS 304L and Inconel using BAg-1 and BNi-7 filler materials were joined firmly. Some spot flaws were found at the joining places using BNi-7 filler material, however, they turned out not to affect the strength of the materials.
심규택(Kyue-Taek Shim),김재훈(Jae-Hoon Kim),이관희(Kwan-Hee Lee),안병욱(Byung-Wook Ahn),김영균(Young-Kyun Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This study is to evaluate the fatigue crack growth characteristics for base metals and welded metal of 9% Ni steels. Since this material has very excellent fracture toughness at low temperature, it has been widely used for inner walls of LNG storage tank. These materials to compare fatigue crack growth (FCG) behaviour are treated with heat by the method of quenching and tempering (QT), and quenching, lamellarizing and tempering (QLT). FCG tests using compact temsion (CT) specimen under stress ratio R=0.1, 0.5, and constant load are carried out. K-increasing tests are conducted by the standard test method described in ASTM E 647. To investigate the effect of welded metal on the crack growth rate, the locations of notch tip were chosen at the center of welded metal and heat affected zone (HAZ). Form the results, FCG rate has almost same tendency according to stress ratio, base and welded metal, the locations of welded metal. FCG rate of welded metal is somewhat faster than base metal. Also scanning electron microscope (SEM) is used to observe the striation of the fractured surface after fatigue crack tests.
LNG 저장탱크용 9% Ni강 용접부의 저온피로균열진전 특성
김재훈,심규택,김영균,안병욱,Kim, Jae-Hoon,Shim, Kyue-Taek,Kim, Young-Kyun,Ahn, Byoung-Wook 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.5
The fatigue crack growth characteristics of base metal and weld joint of 9% Ni steel for LNG storage tank was carried out using CT specimen at room temperature and $-162^{\circ}C$. Fatigue crack growth rate of base and weld metals at RT and $-162^{\circ}C$ was coincided with a single line independent of the change of stress ratio and temperature. In the region of lower stress intensity factor range, fatigue crack growth rate at $-162^{\circ}C$ was slower than that at RT, and the slop of fatigue crack growth rate at $-162^{\circ}C$ increased sharply with propagating of fatigue crack, fatigue crack growth rate at RT and $-162^{\circ}C$ was intersected near the region of $2{\times}10-4\;mm$/cycle, and after the intersection region, fatigue crack growth rate at $-162^{\circ}C$ was faster than that at RT. The micro-fracture mechanism using SEM shows the ductile striation in the stable crack growth region. Also the defects of weld specimen after fatigue testing were detected using the A scan of ultrasonic apparatus.
저온하에서 LNG저장탱크 내조용 9% Ni강의 피로균열진전거동
김영균(Young-Kyun Kim),김재훈(Jae-Hoon Kim),심규택(Kyue-Taek Shim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The fatigue crack growth behavior of the 9% Ni steel developed for inner shell material of LNG storage tank was examined experimentally at 293K and 111K. Newly developed heavy thick plates of 9% Ni steel for large capacity of LNG tank were fabricated to conduct a fatigue crack growth test. Also the weld metal specimens were prepared by taking the same weld procedure applied in actual LNG storage tank inner shell. Investigations have been carried out to study the influence of temperature and weld effect on fatigue crack growth behavior. It has been confirmed that some effects of load ratio and low temperature were found on the fatigue crack growth rates.