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RISS 인기검색어
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- 저자 : Kanglong Wu (검색결과 3 건)
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Ci Li,Xinjian Yuan,Kanglong Wu,Haodong Wang,Zhan Hu,Xueyu Pan 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
Resistance spot welded joints in different configurations of DP600 and DC54D were investigated to elucidate thenugget formation process and mechanical properties of the resultant joints. Results show that, when the weldingtime was less than 4 cycles, the fusion zone (FZ) was not formed, but the heat-affected zone (HAZ) occurred with a“butterfly” shape. In 4 cycles, the FZ in dissimilar sheets occurred with an “abnormal butterfly” shape because of nuggetshift. When the welding time increased to 14 cycles, the FZ exhibited a “bread loaf” shape and the weld shifted to“dog bones.” The nugget can be divided into three regions, namely, FZ, HAZ1, and HAZ2, and the FZ consisted oflath martensite. The micro hardness of DP600 FZ was lower than that of HAZ because of the dilution of DC54D. The failure mode of B changed from interfacial failure to plug failure during the nugget formation process. The tensile-shear load of sound weld is 6.375, 6.016, and 19.131 kN.
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Dissimilar Resistance Spot Welding of DP 600/A5052/DP 600 Triple Sheets
Ting Li,Xinjian Yuan,Zhan Hu,Kanglong Wu,Haodong Wang,Bangqiang Zhang 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.11
Triple sheets of DP 600/A5052 aluminum alloy/DP 600 steel were joined by means of resistance spot welding in this study. The experimental results showed that the microstructure of fusion zone was lath martensite for DP 600 and column crystals for A5052. Their grains coarsened with increasing distance away from the base metals. The interface zone between DP 600 and A5052 was composed of continuous Fe2Al5 intermetallic compound (IMC) layer and needle-like Fe4Al13 IMC. When welding time prolonged from 8 cycles to 17 cycles, the average length of Fe4Al13 phase adjacent to A5052 shortened from 2.3 μm to 0.89 μm, whereas the thickness of Fe2Al5 IMC layer near DP 600 widened from 1.59 μm to 2.59 μm. The tensile-shear load of DP 600/A5052/DP 600 joints reached a maximum value of 10.796 kN with 14 cycles welding time. Failure during tensile-shear testing occurred along DP 600/A5052 interfaces because Fe2Al5 and Fe4Al13 were brittle phases, but an amount of tearing area was found on the fracture surface.
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Ting Li,Xinjian Yuan,Rui Li,Jiankun Xiong,Shiwei Tao,Kanglong Wu 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.6
Dissimilar 9% Cr heat-resistant steels (G115 and CB2) with good creep properties for ultra-supercritical steam turbines were butt-joined by tungsten inert gas welding. The microstructure of welded metal (WM) was quenched martensite without carbide precipitates and lath packets existed inside prior austenite grains (PAGs), which leaded to higher hardness of WM. Partially melted zone at G115 side was composed of untempered martensite within equiaxed PAGs. The lowest hardness occurred in both G115 and CB2 steels which was attributed to tempered martensite with many M 23 C 6 precipitates. The heat-affected zone consisted of three sub-grains and their microstructure was detailly analyzed in current work. As current increased from 130 to 150 A, both the tensile strength at room temperature and 650°C increased while strength had no obvious change with further increasing current. The values of 673 MPa and 309 MPa corresponded to the tensile stress with 150 A at room temperature and 650°C, respectively. The fracture mode of joints at room temperature was cleavage and ductile failure at 130 and 150 A, respectively. The high-temperature fracture surface at 150 A was composed of deep and fi ne dimples.
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