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Effects of CaF2 coating on the microstructures and mechanical properties of tungsten inert gas welded AZ31 magnesium alloy joints; Effects of CaF2 coating on the microstructures and mechanical properties of tungsten inert gas welded AZ31 magnesium alloy joints
Shen, Jun1; Wang, Linzhi1,2; Peng, Dong1; Wang, Dan1
2012 ; 2012
摘要The effects of CaF2 coating on the macromorphologies of the welded seams were studied by morphological analysis. Microstructures and mechanical properties of butt joints welded with different amounts of CaF 2 coatings were investigated using optical microscopy and tensile tests. The welding defects formed in the welded seams and the fracture surfaces were analyzed by scanning electron microscopy. An increase in the amount of CaF2 coating deteriorated the appearances of the welded seams but it improved the weld penetration depth and the depth/ width (D/W) ratio of the tungsten inert gas (TIG) welded joints. The α-Mg grains and Mg 17(Al,Zn)12 intermetallic compound (IMC) were coarser in the case of a higher amount of CaF2 coating. The increase in the amount of CaF2 coating reduced the porosities and total length of solidification cracks in the fusion zone (FZ). The ultimate tensile strength (UTS) value and elongation increased at first and then decreased sharply. © 2012 The Minerals, Metals & Materials Society and ASM International.; The effects of CaF2 coating on the macromorphologies of the welded seams were studied by morphological analysis. Microstructures and mechanical properties of butt joints welded with different amounts of CaF 2 coatings were investigated using optical microscopy and tensile tests. The welding defects formed in the welded seams and the fracture surfaces were analyzed by scanning electron microscopy. An increase in the amount of CaF2 coating deteriorated the appearances of the welded seams but it improved the weld penetration depth and the depth/ width (D/W) ratio of the tungsten inert gas (TIG) welded joints. The α-Mg grains and Mg 17(Al,Zn)12 intermetallic compound (IMC) were coarser in the case of a higher amount of CaF2 coating. The increase in the amount of CaF2 coating reduced the porosities and total length of solidification cracks in the fusion zone (FZ). The ultimate tensile strength (UTS) value and elongation increased at first and then decreased sharply. © 2012 The Minerals, Metals & Materials Society and ASM International.
语种英语 ; 英语
DOI10.1007/s11661-012-1204-7 ; 10.1007/s11661-012-1204-7
页码4397-4405 ; 4397-4405
通讯作者Shen, J. (shenjun2626@163.com) ; Shen, J. (shenjun2626@163.com)
收录类别EI ; EI