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《Optics and Precision Engineering》 2011-02
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Effects of parameters on microstructure of bonding interface formed by overlapping laser cladding

HUANG Feng-xiao1,2,JIANG Zhong-hao1,LIU Xi-ming3(1.Key Laboratory of Automobile Materials,Ministry of Education,College of Materials Science and Engineering,Jilin University,Changchun 130025,China;2.Department of Engineering Mechanics,Aviation University of Air Force,Changchun 130022,China;3.School of Materials Science & Engineering,Changchun University of Technology,Changchun 130012,China)  
In order to improve the cladding quality and to control the bonding interface of the layer formed by overlapping laser cladding,the effects of parameters on the microstructure of bonding interface were studied.The results show that when scanning speed,powder feeding rate and laser power change in the range of 100-250 mm/min,6-7.5 g/min and 1 500-2 500 W,respectively,the bonding region does not appear a white layer and presents different morphologies.One of morphologies is the continuous epitaxial growth with inherited microstructures and directions,and the other is discontinuous epitaxial growth.This is related to the effects of parameters on the depth of remelting region of a shifted dendrite,the orientation and molten degree of grain of a prior layer surface,and the con-vection in the molten pool.
【Fund】: 国家自然科学基金资助项目(No.50771049)
【CateGory Index】: TG174.44
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