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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.
마르텐사이트계 스테인리스강 (12%Cr)의 피로균열 진전거동 및 파괴인성연구
윤병주,최재하 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.4
Martensitic stainless steels containing 12%Cr are commonly used in quenched and tempered conditions. The quenching heat treatment involves annealing to obtain austenite and to dissolve the carbides, followed by cooling to transform the austenite into martensite and often to cause carbide precipitation. In this study, we used three different tempered specimens which were tempered at 600℃, 670℃ and 750℃ The crack propagation and fracture toughness tests were performed on this three different specimens The experimental results showed that the highest value of crack growth rate and the lowest value of fracture toughness were observed in the specimen which were tempered at 600℃. howeber, when the specimen were tempered at 750℃, the value of crack growth rate was significantly decreased and the value of fracture toughness was significantly increased as compared to which were tempered at 600℃.