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Yan Q.,University of Science and Technology Beijing | Wang F.-M.,University of Science and Technology Beijing | Cheng H.-J.,University of Science and Technology Beijing | Zhang J.-P.,University of Science and Technology Beijing | Sang D.-G.,Wuyang Iron and Steel Co.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

Based on the measurement of the different dilatometric curves of continuous cooling transformation by using DIL805A quenching and deformation dilatometer, optical microstructure and hardness measurement, the continuous cooling transformation (CCT) curve was obtained for the under-cooled austenite of WQ960E steel. The effect of cooling rate on microstructure evolution was investigated by optical microscope and scanning electron microscope. The results show that the microstructure of the tested steel consists of ferrite(F) and granular bainite(GB) after phase transition at the cooling rate of 0.06°C/s; the granular bainite(GB) appeares at the cooling rate of 0.2°C/s; the microstructure contains granular bainite(GB) and lath bainite(LB) at the cooling rate of 0.5°C/s; the martensite(M) is observed at the cooling rate of 5°C/s.

Wang H.C.,Anhui University of Technology | Liu D.,Wuyang Iron and Steel Co. | Liao Z.Y.,Anhui University of Technology | Li M.,Anhui University of Technology | And 4 more authors.
Advanced Materials Research | Year: 2011

Molten, commercially pure aluminum has been treated ultrasonically with differing input power. The results show that the ultrasonic power can significantly refine the microstructure of the aluminium and increase the hardness of the samples. A mathematical model developed in this paper can predict the effect of the ultrasonic power on the grain size of the pure aluminium well. © (2011) Trans Tech Publications.

Sun F.,Tongji University | Sun M.,Tongji University | Li G.,Tongji University | Xiao Y.,London South Bank University | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

Three flush end-plate bolted steel connections were tested under cyclic loading in this research program. One specimen was designed with Q345 steel end-plate and the other two were constructed with Q690 high strength steel end-plates. Two different steel grades (Q345 and Q690) were also chosen for the beam and column members. The influence of rigid column and nonrigid column on connection behavior was also considered. The test results were compared with the calculated values by the component method from Eurocode EC3.It is shown that the moment resistance of the connections with high strength steel is 30% higher than that of normal strength steel. However, the bolts in the steel connections with high strength end-plate are prone to fracture due to the thick plate used. Therefore, either large size bolts or thinner end-plates can be used to improve the ductility of the high strength steel connections. The moment resistance for steel connections with rigid column is nearly the same as the nonrigid one. The method proposed in EC3 for moment resistance calculation of the mild steel connection is still applicable to the high strength steel connection, but the methods for evaluating rotational stiffness and identifying failure mode for a high strength connection are no longer valid.

Chang Y.,Control Iron and Steel Research Institute, China | Wei M.,Wuyang Iron and Steel Co. | Liu L.,Wuyang Iron and Steel Co.
Proceedings of the 10th International Conference on Steel Rolling | Year: 2010

Large thickness ESR steel is of various features, i. e., high cleanliness, good soundness, homogeneous chemical composition and excellent application performance. Since the startup of the domestic first large slab ESR furnace in Wuyang Iron and Steel Co., Ltd. ( hereinafter referred to as Wugang), dozens of ESR steel grades of large thickness and higher internal quality have been developed in succession by Wugang, which filled the blank of high end products in the field of wide and heavy plate in China and replaced the forging products. The article highlights the current situation of ESR furnace and the development of ESR steel grades, and carries out analysis on the quality problems occurred in the process of product development, presenting an approach for the development of high end ESR steel grades in the future.

Chen S.,Tongji University | Lu Z.,Tongji University | Li G.,Tongji University | Wei M.,Wuyang Iron and Steel Co. | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

To evaluate seismic performance of Q690D high-strength steel (HHS) welded columns, cyclic loading tests were carried out for H-section and box-section Q690D HSS welded columns with nominal axial compression ratio of 0.35. Failure modes were observed. The hysteretic loops and skeleton curves of the specimens were obtained. The hysteretic behavior of Q690D HHS welded columns was further studied from the aspects of bearing capacity, plasticity development, deformation capacity and energy dissipation capacity. According to the test results, Q690D HHS welded columns show good energy dissipation capacity and seismic performance. Second order effect cannot be neglected for Q690D HHS welded columns. The failure mode of Q690D welded column subjected to cyclic loading is elasto-plastic local buckling of plate. The maximum inter-story drift angle reaches 1/17 for H-section columns and 1/23 for box-section columns respectively, which far exceeds the requirement of GB 50011-2010 'Code for seismic design of buildings'. Flame straightening significantly affects the mechanical properties of welded box-section HHS columns and then the failure location. Thus it should be strictly restrained from applying flame straightening at the location with high stress ratio for high strength steel member. ©, 2014, Science Press. All right reserved.

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