Effect of gas nitriding on oxidation behavior of F92 steel in air at 700 ℃

doi:10.13251/j.issn.0254-6051.2022.06.043

Abstract

Abstract: High temperature oxidation behavior of as-delivered and nitrited F92 steel was studied in static air at 700 ℃ by using scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and the influence of gas nitriding on oxidation behavior of the F92 steel was elucidated. The results show that an expanded ferrite phase supersaturated with nitrogen and CrN phase are formed on the surface of the nitrided specimen. Thin and dense (Cr, Fe, Mn)₂O₃ and MnCr₂O₄ oxide layers are formed on the surface of the as-delivered F92 steel with good protection. In addition, there are two kinds of nodular oxides on the surface of as-received F92 steel, one is composed of continuous Fe₂O₃, and the other is independent composed of outer Fe₂O₃ and inner Cr-rich (Cr, Fe, Mn)₃O₄. Nitriding aggravates the oxidation of F92 steel, and an internal oxidation zone is observed inside the matrix. The oxide film on the surface of the nitrided specimen has a double-layer structure, in which the outer layer is Fe₂O₃ and the inner layer is Cr-rich Fe-Cr oxide. The expanded nitrogen supersaturated ferrite phase and CrN phase formed during the nitriding process of F92 steel and the CrN precipitation phase precipitated during the oxidation process reduce the activity of chromium and hinder the formation of protective chromium-rich oxides, resulting in a decrease of antioxidant property.

Key words: F92 steel, gas nitriding, high temperature oxidation, nodular oxide, expanded ferrite

CLC Number:

TG178

Wang Bo, Huang Yijun, Xiong Dingbiao, Zhao Weiwei, Lou Yumin, Zhao Ningning. Effect of gas nitriding on oxidation behavior of F92 steel in air at 700 ℃[J]. Heat Treatment of Metals, 2022, 47(6): 240-248.

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