Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (6): 792-800.DOI: 10.12068/j.issn.1005-3026.2020.06.006

• Materials & Metallurgy • Previous Articles     Next Articles

High Temperature Oxidation Behavior of Ni-based Low Temperature Steel

CAO Guang-ming, GAO Xin-yu, SHAN Wen-chao, PAN Shuai   

  1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2019-10-31 Revised:2019-10-31 Online:2020-06-15 Published:2020-06-12
  • Contact: CAO Guang-ming
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Abstract: The oxidation behavior of Fe-3.5Ni and Fe-9Ni at 700~1200℃ was investigated using Setsys Evolution high-temperature thermal gravimetric analyzer to study the high temperature oxidation behavior of Ni-based low temperature steel. The oxide morphology and phase composition were analyzed with electron-probe microanalyzer (EPMA), scanning electron microscopy (SEM), X-ray diffraction (XRD). The results show that the oxidation mass gain curves of Fe-3.5Ni steel and Fe-9Ni steel are similar after oxidation for 2h at 700~1200℃. Under the same oxidation temperature, the unit area mass gain of Fe-9Ni steel is lower than that of Fe-3.5Ni steel. As the oxidation temperature increases, agglomerate floc, whisker and irregular polygonal Fe2O3 appear on the surface of the sample. Further results indicate oxidation is divided into internal and external oxidation. As the oxidation temperature increases, the thickness of the external oxide layers and subscale gradually increases, and 900℃ is the critical point at which the thickness of the outer oxide layers of the two steels changes. The subscale compound consists of FeNi3 and a mixture (FeO+Fe3O4). The external oxidation consists of Fe2O3, Fe3O4 and FeO, and the crystallite phase NiFe2O4 is encapsulated in the external oxide layer; as the Ni content increases, more NiFe2O4 is produced.

Key words: Ni-based low temperature steel, high temperature oxidation, internal oxidation, external oxidation

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