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TMCP 및 QT강 용접부에 있어 균열길이가 파괴특성에 미치는 영향
신용택(Y.T. Shin),신학수(H.S. Shin),강성원(S.W. Kang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.11
This experimental investigation focuses on an evaluation of fracture characteristics of API 2W Gr.50 (TMCP) and 580 ㎫ class high-strength steel (QT) weldments with respect to crack length to width ratio. Crack Tip Opening Displacement (CTOD) values from Single Edge Notched Bending (SENB) specimen are associated with the Charpy toughness of root weld located at the middle of the specimen thickness and showed lower toughness values according to the increasing crack length to width ratio. In fractography analysis, t. The hardness values of the reheated zone in weld metal are lower than the as solidified zone, and fractures are initiated at the reheated zone with low hardness values within the center third of section thickness.