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Oxidation Kinetics of 9Ni Steel Billet at High Temperature |
GUO Tao, HUANG Feng(), HU Qian, LIU Jing |
State Key Laboratory of Refractories and Metallurgy, Hubei Engineering Technology Research Center of Marine Materials and Service Safety, Wuhan University of Science and Technology, Wuhan 430081, China |
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Abstract The oxidation behavior of 9Ni steel slab at 900~1250 ℃ were investigated by employing a combined thermal analysis and mass spectrometer system, field emission scanning electron microscopy (FE-SEM), field emission electron probe microscopy (FE-EPMA), X-ray diffractometer (XRD) and soft wear FactSage10.0. The results show that the constant temperature oxidation of 9Ni steel at 900-1250 ℃ mainly follows the parabolic law, and the oxidation rate is controlled by the diffusion of metallic ions in the oxide layer, Ni exists in the oxide layer in the form of FeNi3 and NiFe2O4 in the inner layer, and elemental Ni enriched at the boundary of the inner/outer layers of the formed oxide scale, and intertangled with Fe-oxides, The high temperature corrosion at grain boundaries of 9Ni steel billet should be attributed to Fe2SiO4 (ferrosilicon olivine) which come from the combining of SiO2 generated by Si oxidation and FeO of the product of iron oxidation, When the temperature is higher than the eutectic temperature (about 1170 ℃), ferrosilicon olivine will be irregularly permeated into austenite grain boundaries in the matrix as liquid.
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Received: 22 August 2022
32134.14.1005.4537.2022.261
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Fund: National Natural Science Foundation of China(U21A20113) |
Corresponding Authors:
HUANG Feng, E-mail: huangfeng@wust.edu.cn
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