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Song Y.M.,Hefei University of Technology | Chen G.H.,Anhui Institute of Electrical Power Science | Wang J.Q.,Anhui Institute of Electrical Power Science | Liu J.J.,Anhui Institute of Electrical Power Science | And 6 more authors.
Metal Science and Heat Treatment | Year: 2014

The microstructures, surfaces and types of fracture of welded joints of dissimilar steels T92/HR3C are studied after short-term tests at 500-650°C. A pioneer equation is obtained for describing the long-term strength of welded joints with the help of data of short-term tensile tests. The values of the long-term strength computed by the equation agree well with experimental data. © 2014 Springer Science+Business Media New York. 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


Chen G.,Anhui Institute of Electrical Power Science | Song Y.,Hefei University of Technology | Wang J.,Anhui Institute of Electrical Power Science | Liu J.,Anhui Institute of Electrical Power Science | And 6 more authors.
Engineering Failure Analysis | Year: 2012

After short-term tensile test at 848-923. K, microstructures, fractographies and fractural mechanisms of the T92/TP347H dissimilar steel weld joints were studied. An equation of the creep rupture strength related to the short-term tensile strength of the joints was firstly derived based on the Goldenberg model [1]. In the high-temperature tensile process, the fracture location of the joints is all in the T92 side fine grained heat affected zone (FGHAZ); however, the fracture mechanism of the joints is changed from a mixed mode (normal plus shear) to a shear mode as the testing temperature risen, which was explained in terms of the stress tri-axiality theory. Moreover, an equation of the creep rupture strength of the weld joints was derived, and then the creep rupture strength of the joints was doped out, σ105873=49.0MPa. It indicates that the joints have a high reliability when used in the USC power units. © 2012 Elsevier Ltd. 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


Liu J.-J.,Hefei University of Technology | Chen G.-H.,Anhui Institute of Electrical Power Science | Yu X.-H.,Hefei Jinli Power Science and Technology Co. | Wang J.-Q.,Anhui Institute of Electrical Power Science | And 4 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011

T92/HR3C dissimilar steel welding joints were produced by gas tungsten arc welding (GTAW) using two Ni-based welding wires of ERNiCr-3 and ERNiCrMo-3, respectively. Microstructure and mechanical properties of the T92/HR3C dissimilar steel welding joints were studied. Effects of post-weld heat-treatment on microstructure and mechanical properties of the joints were also investigated. The results show that the welding seam in the T92/HR3C dissimilar steel welding joints is composed of the Ni-based dendritic cellular structure. The T92 heat effected zone (HAZ) mainly consists of the superheated zone, coarse grain zone and fine grain zone. The grain growth of the HAZ of HR3C steel is not remarkable, however, the cabrides and/or nitrides is detected, precipitating along grain boundaries and inside the grains. The ERNiCrMo-3 welded joints are of higher tensile strength, plasticity and hardness, however, lower impact toughness compared with the ERNiCr-3 welded ones. Under tensile stress, the fracture of the joints takes place at the base metals for the ERNiCrMo-3 welded joints, but at the welding seam for the ERNiCr-3 welded joints. Post-weld heat-treatment can improve mechanical properties of the two T92/HR3C dissimilar steel welding joints. Source

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