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Journal of KWJS 2010;28(5):45-50.
Published online November 5, 2010.
LNG 저장탱크용 9% Ni강 용접부의 저온피로균열진전 특성
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Fatigue Crack Growth Characteristics of 9% Ni Steel Welded Joint for LNG Storage Tank at Low Temperature
Jae-Hoon Kim, Kyue-Taek Shim, Young-Kyun Kim, Byoung-Wook Ahn
Abstract
  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℃. Fatigue crack growth rate of base and weld metals at RT and -162℃ 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℃ was slower than that at RT, and the slop of fatigue crack growth rate at -162℃ increased sharply with propagating of fatigue crack, fatigue crack growth rate at RT and -162℃ was intersected near the region of 2x10-4 mm/cycle, and after the intersection region, fatigue crack growth rate at -162℃ 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.
Key Words: LNG storage tank, 9% Ni steel, Fatigue crack growth rate, Weld metal, Low temperature, Striation, Ultrasonic
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