발간논문

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Vol.26, No.2, 178 ~ 186, 1988
Title
Fatigue Crack Growth Behavior of Welded High - Tensile - Strength Steel
이종수Jong Su Lee, 고광진Kwang Jin Ko, 강인찬in Chan kang
Abstract
The present study was fonducted to estimate the fatigue crack growth (FCG) rate and the fracture behavior of a low carbon 1.4% Mn steel (HT50) and its CO₂ gas welded metal. The investigation was made on two different directions of each material: the rolling direction and the transverse direction of the base metal, and the parallel direction and the perpendicular direction to the welding line. The fatigue crack growth rate of the base metal was higher than that of the welded metal and the heat-affected-zone (H.A.Z). Secondary cracks were observed on the fatigue fracture surface of all specimens and these were attributed to the reduction of the fatigue crack growth rate. The experimental values of the fatigue crack growth rate showed a good relationship with the strition spacing calculated from an empirical equation in the low △k region.
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