ラメラテア感受性におよぼす鋼板製造履歴の影響

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The improvement of through thickness ductility in steel plates is an important aspect to prevent the lamellar tearing in heavy welded structures. Many studies on the relationship between the cracking susceptibility and material characteristics, such as morphology of inclusion and chemical composition of steel, have been reported, but little is known about the effect of steelmaking factors on the susceptibility. Tests are carried out using the steels which are manufactured experimentally under the various conditions, and the effects of the ways to minimize oxides and sulfides on the cracking are discussed. Semi-killed steel has a high lamellar tearing susceptibility, and the crack is originated from large shape of FeO-MnO-Al_2O_3-SiO_2 oxide by predominantly shear mode. Si-killed steel with a little amount of Al has a low lamellar tearing susceptibility. For these two steels S content up to 0.026% doesn't affect on the cracking susceptibility. For Al-killed steels with more than 0.01%S the inclusion displayed a significant role against the cracking is found to be sulfide, and the improvement on this type of lamellar tear is readily acquired from using the de-sulferized raw materials. For Al-killed steels with less than the level, the oxides clustered at the sub-surface of steel plates are detrimental inclusions, and the ingotmaking factors, such as the shape of molds and degassing or pouring process, are the most important ingredient. The through thickness tensile specimen imposed synthetically weld thermal stress cycle on reveals that the decohesion of MnS and Al_2O_3 from the matrix is apt to occur at temperatures of about 300℃ during cooling.
社団法人溶接学会の論文
1976-10-05

ラメラテア感受性におよぼす鋼板製造履歴の影響

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