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Zhu H.-Y.,Control Iron and Steel Research Institute, China | Li Z.-B.,Control Iron and Steel Research Institute, China | Wang J.-Q.,New Metallurgy Hi. Technology Group Co. | Yang H.-S.,Control Iron and Steel Research Institute, China
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2012

Solid state reaction between CaCO 3 and MoO 3 was studied using non-isothermal thermal analysis method. On the basis of TG curve and extent of reaction, the chosen 13 solid reaction mechanism functions were fitted respectively. The Coats-Redfern method used for model fitting and kinetic parameter was calculated by slope and intercept. The results indicate that the reaction between CaCO 3 and MoO 3 begins at 450°C, its reaction mechanism belongs to random nucleation and growth with integral form g(α)=-ln(1-α), the apparent activation energy is determined to be about 170.2 kJ/mol with pre-exponential factor of about 1.3(10 7 s -1. Source


Guo D.-W.,Control Iron and Steel Research Institute, China | Yuan X.-H.,Control Iron and Steel Research Institute, China | Gu B.-S.,Control Iron and Steel Research Institute, China | Zhang T.-J.,New Metallurgy Hi. Technology Group Co. | And 3 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

Deformed galvannealed steel sheets (GA) was prepared by 10%, 20% and 30% uniaxial tensile strain. Corrosion behavior of the deformed GA steel sheets in 3.5% NaCl solution was examined by means of potentiodynamic polarization and electrochemical impedance spectroscopy, and the morphology of the coatings surface before and after corrosion was characterized by scanning electron microscopy. The results show that with the degree of deformation increase, the alternating-current impedance decreases, and the impedance value decreases remarkably in the initial stage of deformation, corrosion current of the GA coatings first decrease and then increase, which indicates that GA coating has high keeping charge ability when the deformation is 10%. Pitting corrosion occurs within the cracks of deformed GA coatings preferentially, corrosion depth and area was increase with deformation increasing. The width of the cracks on surface of GA coatings is not performed as the corrosion attack origin when the deformation is 30%. Source


Yuan X.-H.,Control Iron and Steel Research Institute, China | Zhong H.-F.,New Metallurgy Hi. Technology Group Co. | Li N.,New Metallurgy Hi. Technology Group Co. | Jiang S.-M.,Control Iron and Steel Research Institute, China | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

The electrolytic stripping technique (also known as coulometric dissolution) was a method to analysis the phase structure of galvannealed coating quantitatively, but the experimental data of electrolytic stripping cannot be used straightforwardly for Fe-Zn phase identification, and because the quantification needs to take into account the effect of various electrochemical side-reactions. The applicability of electrolytic stripping for the phase analyzing of galvannealed coatings was optimized in this article. The results show that electrolytic stripping technique can be applied to realize step-by-step dissolution of various species of phases in the galvannealed coatings under the condition that the potential scanning rate is low enough, and the method allows the determination of the total Fe concentration, and the thickness of the η, ζ, δ and Γ phases. Both the thickness and the various intermetallic phases content of the galvannealed coatings with different aluminum contents was characterized by the polarization curves obtained using the electrolytic stripping technique and the proposed data analysis method, and combining the initial dissolution potential of every Fe-Zn phase in galvannealed coatings. Source


Chen B.-K.,New Metallurgy Hi. Technology Group Co. | Zhang Q.-F.,New Metallurgy Hi. Technology Group Co. | Jiang S.-M.,New Metallurgy Hi. Technology Group Co. | Hao X.-D.,New Metallurgy Hi. Technology Group Co.
Kang T'ieh/Iron and Steel | Year: 2012

The micrographs, distribution and chemical compositions of precipitations in hot-rolling and different annealing processes were analyzed, and the influences of annealing parameters on precipitations were also studied by TEM and EDS about galvanized 440MPa high strength IF steel for automotive. The results show that the precipitations are mainly composed of TiN, NbC, TiC and Fe(Ti+Nb)P in hot rolling and annealing. The precipitations quantity of annealed steel is more than hot rolled steel, and the original coarse precipitation are reduced and original small precipitations are growth with the increasing of annealing temperature and holding time. Source


Xu X.-Q.,Northeastern University China | Xu X.-Q.,New Metallurgy Hi. Technology Group Co. | Hao X.-D.,New Metallurgy Hi. Technology Group Co. | Zhou S.-G.,New Metallurgy Hi. Technology Group Co. | And 2 more authors.
Journal of Iron and Steel Research | Year: 2016

Hot dip galvanizing (HDG) annealing process has an important influence on the mechanical properties of the hot dip galvanized sheet. The core of achieving precise annealing process for hot dip galvanized sheet is to set reasonable annealing temperature program and control its temperature accurately. The influence of annealing technology on the performance of hot dip galvanized sheet was analyzed, and then the data-driven annealing technology setting strategy was proposed against the shortcomings of the methods currently used, which enabled annealing process of the hot dip galvanized sheet to be optimized continuously. Meanwhile, through systematically reviewing the model-based temperature control strategies of HDG annealing process, as well as considering the characteristics of HDG annealing furnace, an applicable model integrating data with physical models was developed to control the galvanizing annealing temperature, by means of which, the precise heat treatment of the hot dip galvanized steel could be well achieved. Source

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