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Chen G.-H.,Anhui Institute of Electrical Power Science | Tang X.-L.,Hefei University of Technology | Liu J.-J.,Anhui Institute of Electrical Power Science | Wang J.-Q.,Anhui Institute of Electrical Power Science | And 2 more authors.
Corrosion and Protection | Year: 2014

Cu/A1 plane contact type terminal connectors were produced by ultrasonic dip soldering technique. The phases and microstructure of the corrosion products, corrosion mechanism and effect of the corrosion process on the electrical property of the Cu/A1 terminal connector were studied through a 7 days NaCl salt spray experiment. The results show that corrosion of the Cu/Al terminal connector mainly resulted from the galvanic corrosion between Al plate and Sn-Pb alloy solder. The corrosion products were complicated, mainly including oxides, hydroxides and alkaline chlorides of Al and Sn. Corrosion cracks of the connector located at the Al plate/the Sn-Pb alloy solder interface. The electrical resistivity of the connector increased obviously as the corrosion time increased. Source


Zhang J.-K.,Hefei University of Technology | Chen G.-H.,Anhui Institute of Electrical Power Science | Wang J.-Q.,Anhui Institute of Electrical Power Science | Zhang T.,Anhui Institute of Electrical Power Science | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2011

The dry/wet NaCl+NaHSO3 atmosphere-salt spraying experiment of the aluminum conductor steel reinforced (ACSR) conductor was carried out to study the phases and microstructures of corrosion products and the corrosion mechanism in simulated air corrosion condition. The results show that the ACSR conductor is mainly corroded by pitting corrosion. The corrosion layer mainly consists of hydroxides, sulfates and sulfate-chloride double salts and their hydrates of Zn and Al. At the initial corroding stage, the corrosion pits form on the Al strands and the galvanizing Zn layer, which are gradually replaced by the continuous corrosion layers as prolonging the spraying time. In the ACSR conductor, a primary cell is generated between the galvanizing Zn layer and the internal Al layer in the electrolyte. In the cell, as an anode, the galvanizing Zn layer is violently etched, contrarily, as a cathode, the internal Al layer is protected. In the ACSR conductor, the sequence of the corrosion rate from high to low is the galvanizing Zn layer, the external Al layer and the internal Al layer. Source


Bai X.,Hefei University of Technology | Bai X.,Anhui Institute of Electrical Power Science | Pan J.,Hefei University of Technology | Pan J.,Anhui Institute of Electrical Power Science | And 3 more authors.
Energy Materials: Materials Science and Engineering for Energy Systems | Year: 2014

Microstructure and mechanical properties of the HR3C austenite heat resistant steel were investigated after artificial aging at 650°C for time up to 3000 h. The results show that as the aging time increased, the room temperature tensile and impact fracture mechanisms of the HR3C steel change from trans- to intergranular fracture. M23C6 type carbides and MX type carbonitrides continuously precipitate during aging, leading to the change of the mechanical properties and fracture mode of the steel. Moreover, the dissolution of the coherent twins and the transformation from the incoherent twins to the thermodynamically stable austenite subgrains have great effects on the mechanical properties of the aged steel, too. When increasing the aging time to ≥2000 h, the microstructure and mechanical properties of the steel are nearly constant, indicating a good thermal stability of the HR3C steel at elevated temperature. © 2014 Institute of Materials, Minerals and Mining. Source


Song Y.-M.,Hefei University of Technology | Chen G.-H.,Anhui Institute of Electrical Power Science | Yu X.-H.,Hefei Jinli Power Science and Technology Co. | Liu J.-J.,Anhui Institute of Electrical Power Science | And 5 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Short-term tensile tests of T92/HR3C dissimilar weldedJoints were carried out at 500°C and 625°C to study plastic deformation and fracture behavior of the joints at high temperature. The results show that there are no observable plastic deformation and structural evolution at the welding seam, the heat affected zone (HAZ) of T92, T92 base metal and the HAZ of HR3C steel during the high-temperature tensile tests, except the necking section of the specimens. However, grains of the HR3C base metal are obviously elongated. Plastic deformation of the HR3C base metal decreases with increasing the testing temperature with less twin recovery. The high-temperature tensile fracture of the joints is located at the fine-grained heat affected zone (FGHAZ) closed to the T92 base metal, and a mixed fracture mode under normal stress and shear stress was present, which is different from those of the joints during room temperature tensile tests. The stress triaxiality theory was successfully applied to explain the plastic deformation and facture behavior of the joints during the short-term tensile tests at high temperature. Source


Zhang Q.,Hefei University of Technology | Wang J.-Q.,Anhui Institute of Electrical Power Science | Chen G.-H.,Anhui Institute of Electrical Power Science | Liu J.-J.,Anhui Institute of Electrical Power Science | And 5 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2013

T92/Super304H dissimilar steel joints were produced through gas tungsten arc welding (GTAW) technique, using two Ni-based welding wires of ERNiCr-3 and ERNiCrMo-3, respectively. The microstructures and mechanical properties of the joints were then studied. The results show that in the heat-affected zone (HAZ) of the T92 side, lots of second-phase particles precipitate along the grain boundaries and inside the grains of the prior austenites. The fine grain zone of the T92 side HAZ is of a sorbite structure. In the Super304H side HAZ, the austenitic grains grow up rapidly with lots of precipitates along the grain boundaries. The ERNiCr-3 welding seam in the joint is of a coarse cellular structure. Comparatively, the ERNiCrMo-3 welding seam is of dense columnar grains. The ERNiCrMo-3 welded joints have higher strength, ductility and hardness, however, the ERNiCr-3 welded joints have a higher impact toughness value. Moreover, the tensile fracture of the formers takes place in the Super304H base metal, while that of the latters happens in the welding seam. Source

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