Oxidation behavior of 590MPa high strength ship plate steel at high temperature
XIA Wen,JIA Juan,LIU Jing,CHAI Xiyang
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1.The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;2.Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract: The actual hot rolling heating process was simulated by means of thermogravimetric analyzer (TGA), and the oxidation law of 590MPa high strength ship plate steel was studied in a heating furnace atmosphere at 1100-1250℃ for 120min and 1250℃ for 10-120min in the heating furnace atmosphere. By the use of scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), electron probe microanalyzer(EPMA) and Xray diffraction(XRD), the morphology and element distribution on the surface and the crosssections of the oxide layer were investigated, the phase composition of the oxide layer was detected and the oxidation behavior of 590MPa high strength ship plate steel was analyzed. The results show that after holding at different temperatures for 120min, the oxidation weight gain curve conforms to the parabolic law, the oxidation rate gradually increases, and the oxidation rate decreased slightly at 1250℃. After oxidation at 1250℃, the crosssections of the test steel oxide layers are in the following order from outside to inside: outer oxide surface layer, outer oxide inner layer, and transition layer. With the increasing oxidation time, the outer oxide inner layer and the transition layer gradually grow thicker. The outer oxide surface layer consists of the Fe oxides and the composite oxides FeSiO3 and FeCr2O4. The Ni elements are enriched at the interface between the oxide scale and the matrix, preventing the continuing oxidation while the Fe oxides and the Nirich metal particles form the outer oxidized inner layer. A small number of O ions diffuse into the interior of the alloy. The Si and Cr elements undergo selective oxidation and nucleated and grew to form the transition layer. With the prolongation of oxidation time, the outer oxide inner layer and the transition layer gradually thicken.
XIA Wen1,JIA Juan1,LIU Jing1,CHAI Xiyang2.
Oxidation behavior of 590MPa high strength ship plate steel at high temperature[J]. Journal of Iron and Steel Research, 2023, 35(9): 1142-1151 https://doi.org/10.13228/j.boyuan.issn1001-0963.20220355