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《Welding Technology》 2012-05
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Study of CTOD toughness and micromechanism of welded joints of thick marine steel plate S355G10+N

LENG Shu-wei1,MIAO Zhang-mu1,QIU Fu-xiang2,NIU Li-na1,MIAO Ting1(1.School of Transportation of Wuhan University of Technology,Wuhan 430063,Hubei pro.,China;2.Hunan Valin Xiangtan Iron & Steel Co.,Ltd.,Xiangtan 411101,Hunan pro.,China)  
Several tests including CTOD and Charpy impact had been performed on the welded joints of high strength low alloy steel S335G10+N to identify the toughness.The fracture surface and microstructure of samples extracted from the welded joints were characterized using scanning electron microscopy.Based on all data obtained some relationships between toughness(CTOD and Charpy impact energy) and microstructure had been detected.The tendency of Charpy impact energy distribution with the position of notch was similar to the CTOD values in WP and FL,but different in FL+2.CTOD values of FL+2 were greater than those of FL,the Charpy impact energy had an opposite tendency.The appearance of pearlite and upper bainite found in WP sample S3554 was regarded as one of the reasons for the lowest CTOD values.The cavity and quasi-cleavage in S35510(FL) fracture surface indicated an inferior toughness compared with some dimples and ripple morphology of slip separation in S3552(FL+2).This situation conformed to the tendency of CTOD values.
【CateGory Index】: TG407
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