State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China

State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China

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Shi J.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Yuan G.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Jiang L.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Li Z.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | And 2 more authors.
Steel Research International | Year: 2015

The objective of the study is to determine the heat transfer symmetry of a single group oblique slot jet impingement for high temperature strip. The influence of the jet velocity of fluid inlet (V), the jet angle (θ), the ratio of fluid inlet to the top and bottom surface spacing (H), and the width of the fluid inlet (W) was investigated numerically. The velocity streamline of the flow domain, the local Nusselt number of the top and bottom surface and the coordinate values of stagnation point are obtained. The results indicate that, the average Nusselt number of the upstream region decreases by about 7.2-53.1% with the increase of θ, which is in the downstream region mildly decreases by about 2.8-14.5% for various combinations of V and H. The discrepancy of average Nusselt number for the top and bottom surface monotonically decreases by about 26-117% with the increase of jet velocity from 1.5 to 4m/s, and increases by about 4-116% with the increase of jet angle from 25 to 45°. The functional relationship between the systematic parameters and the discrepancy of the average Nusselt number or the coordinate values of stagnation point is derived. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Yang H.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Liu Z.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Zhou X.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Wang G.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China
Steel Research International | Year: 2015

In order to control the microstructure and nanoscale Nb(C, N) precipitation in a Nb microalloyed steel, three deformation schedules were employed, followed by cooling process to study the transformation and precipitation behaviors of the tested steel. It was found that plastic deformation in the non-recrystallization region of austenite accelerates the onset of transformation from austenite to ferrite, while the progress of ferrite transformation is retarded. The deformation also refines the ferrite grain size. The transformation behavior for deformation temperature of 850 and 910°C are almost the same due to the similar deformed austenite. Although the latter deformation temperature is 60°C higher, the deformation can also significantly refine the transformation microstructure. With the decrease in deformation temperature and increase in cooling rate, the precipitation start temperature decreases, and the nucleation zone of precipitation is transformed from austenite to ferrite or bainite under continuous cooling condition. When the cooling rate reaches 10°Cs-1, the nucleation of precipitation is totally inhibited during cooling process. The precipitate size is significantly refined by increasing cooling rate due to the increase of precipitation driving force. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Lu X.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Fang F.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Zhang Y.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Wang Y.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | And 5 more authors.
Steel Research International | Year: 2016

Grain-oriented 4.5%Si steel is processed by strip casting and two-stage rolling with second rolling reduction varied from 53.3 to 82.7%. The microstructure and texture evolution are studied with emphasis on the effect of second rolling reduction on secondary recrystallization. After secondary annealing, significant abnormal grain growth occurs for all reductions in the range of 53.3-82.7%. The underlying reason is the strong inhibiting force induced by additional Nb, and the grain diameter of the secondary grains increase with increased rolling reduction. Additionally, the sharpness of secondary grains to ideal Goss orientation increase with increase in second rolling reduction. This is attributed to decreased inhibiting force drop rate between abnormal grain growth of precise Goss and deviated Goss grains with increased rolling reduction. Another interesting aspect is enhancement of magnetic induction B8 and significant reduction in high frequency (400-1000Hz) core losses with increase in second rolling reduction. Optimal magnetic properties are obtained in the steel subjected to 82.7% rolling reduction. The present study suggests that strip casting is an effective approach to fabricate grain-oriented high silicon steel, especially thin-gauged steels with superior magnetic properties. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Wang Y.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Zhang Y.-X.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Lu X.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Fang F.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | And 5 more authors.
Steel Research International | Year: 2016

An ultra-low carbon grain-oriented silicon steel as-cast strip is produced by twin-roll strip casting process, and subsequently subjected to one-pass hot rolling, one-stage cold rolling, primary annealing, and secondary annealing. The effect of hot rolling process on microstructure, texture, and inhibitor evolution is studied. It is shown that the precipitation behavior of AlN particles is significantly affected by the hot rolling temperature and the optimal precipitation temperature is ≈1100°C. On the other hand, the intensity of Goss texture in hot-rolled sheets is determined by hot rolling reduction, which is limited in the strip casting process and the hot-rolled Goss texture is relatively weak compared to the conventional process. The primary annealed Goss texture can originate from the cold rolling process and this texture is homogeneous through the thickness, besides the inherited hot-rolled Goss texture mainly presented in the subsurface layer. Thus, relatively strong Goss texture in primary annealed sheets is obtained. The results indicate that the hot rolling process is an efficient way to optimize the texture and precipitation in strip-cast silicon steel, and relatively good magnetic properties can be obtained by the strip casting process. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Zhou X.-G.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Zeng C.-Y.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Yang H.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | Ma L.-Y.,State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China | And 3 more authors.
Steel Research International | Year: 2016

The effect of cooling rate and finish cooling temperature after rolling on microstructure and mechanical properties of X100 pipeline steel has been investigated by thermomechanical simulation experiment and hot rolling experiment. Also, microstructure and fracture morphology of X100 pipeline steel have been observed by optical microscopy, transmission electron microscopy, and scanning electron microscopy. The results reveal that finish cooling temperature and cooling rate can strongly affect the microstructure and mechanical properties of experimental steel. To obtain excellent mechanical properties of X100 pipeline steel successfully, the cooling process parameters should be carefully designed. For present instance, the optimal cooling processing schedule has been acquired: the cooling rate after rolling should be adopted in the range of 27-33°Cs-1 and the finish cooling temperature should be controlled within the temperature range 535-560°C. High strength of X100 pipeline steel is from a mixture of bainitic ferrite laths with a mean width of 0.55μm containing high-density dislocations, dispersed fine M/A islands, and dispersed nano-precipitates. Moreover, dispersed fine M/A islands and fine inclusions can effectively hinder crack propagation and improve the low-temperature toughness of X100 pipeline steel. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Loading State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China collaborators
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