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Proceedings Paper

Fatigue crack growth properties of the base metal and weld metal of a 9% Ni steel for LNG storage tank
Author(s): Young-Kyun Kim; Kyu-Taek Shim; Jae-Hoon Kim
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Paper Abstract

Newly developed heavy thick plates of 9% Ni steel for large capacity of LNG tank were fabricated to conduct a fatigue crack growth test. The weld metal specimens were also fabricated by taking the same weld procedures which are applied to actual LNG storage tank inner shell. The effect of changes in load ratio, R, and test temperature on the fatigue crack growth rate has been investigated. Separate fatigue crack growth experiments were performed at load ratio of 0.1 and 0.5 at -162°C and compared to the behavior at room temperature. The fatigue crack growth rates of weld metal were nearly the same as those of the base metal irrespective of load ratio change at room temperature. A decrease in temperature decreased the fatigue crack growth rates of base metal but in the case of weld metal only small scatters appeared in the fatigue crack growth rate compared with those of base metals. The fatigue crack growth rates were dominated by residual stress due to welding processes rather than temperature effects.

Paper Details

Date Published: 21 October 2009
PDF: 4 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74936D (21 October 2009); doi: 10.1117/12.843517
Show Author Affiliations
Young-Kyun Kim, Korea Gas Corp. (Korea, Republic of)
Kyu-Taek Shim, Korea Gas Corp. (Korea, Republic of)
Jae-Hoon Kim, Chungnam Univ. (Korea, Republic of)


Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering
Jinsong Leng; Anand K. Asundi; Wolfgang Ecke, Editor(s)

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