脆性破壊の発生に関する研究(第3報) : 80キロおよび60キロ高張力鋼の溶接部の脆性破壊発生特性

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It is necessary for prevention of welded structures from brittle fracture to use steels and electrodes which are suitable to their service conditions and to adopt the suitable welding conditions or heat input. In the previous reports, the mechanism of brittle fracture initiation was studied by using the deep notch test specimens, and the brittle fracture initiation characteristics for various high strength and low temperature structural steels were investigated.In this paper, the brittle fracture initiation characteristics for the welded joint including the bond and the weld metal, deposited manually or automatically in various heat inputs, of a 80 and a 60 kg/mm^2 high strength steels were investigated in comparing with that for the base metal by using the deep notch test specimens with welded joint.In addition, the brittle facture initiation characteristics for the base metal, the bond and the weld metal, deposited manually, of the 80 kg/mm^2 high strength steel in the stress relieved condition of 600℃ × 1 hr were compared with that in the as welded condition.Then, the correlation between the brittle fracture initiation remperature for the half crack length of 40 mm and V-notch Charpy transition temperatures were investigated.Next, the characteristics of brittle crack path along the welded joint of the 80 and the 60 kg/mm^2 high strength steels deposited in various heat inputs were observed to find the case of crack path in a straight line along the bond or in the weld metal.Finally, it was proposed what kinds of brittle fracture characteristics or various portions such as the base metal, the bond and the weld metal should be a criterion under a service condition of welded joint, where the longitudinal or the transverse cracks exist under external loading in the direction parallel or perpendicular to the welded joint, respectively.

脆性破壊の発生に関する研究(第3報) : 80キロおよび60キロ高張力鋼の溶接部の脆性破壊発生特性

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