溶接学会論文集
Online ISSN : 2434-8252
Print ISSN : 0288-4771
780MPa級高張力鋼板のレーザ溶接金属における破壊靱性とミクロ組織
-レーザ溶接の適用による中厚板高強度鋼構造物の高性能化-
半田 恒久猪瀬 幸太郎塚本 進南 二三吉大畑 充萩原 行人
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2008 年 26 巻 1 号 p. 48-53

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Fracture toughness and microstructure of laser weld metal of 780MPa class steels are investigated and compared with those of SM490A and SM570Q. In SM490A and SM570Q, Charpy energy transition temperature of laser weld metals is 60-90°C higher than that of base metal, and upper bainite microstructures are observed in the laser weld metals. In 780MPa class steels, difference of Charpy energy transition temperatures between laser weld metal and base metal are only 10-30°C, and no upper bainite microstructures are observed in the laser weld metals. Hardness of the laser weld metals of 780MPa class steels is identical with that of martensite microstructure. A superior toughness of the laser weld metal of 780MPa class steels would be owing to the martensite microstructure resulted from a high carbon equivalent.

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